How to add empty spaces into MD markdown readme on GitHub?

I'm surprised no one mentioned the HTML entities &ensp; and &emsp; which produce horizontal white space equivalent to the characters n and m, respectively. If you want to accumulate horizontal white space quickly, those are more efficient than  .

no space
 
&ensp;
&emsp;

Along with <space> and  , these are the five entities HTML provides for horizontal white space.

Note that except for  , all entities allow breaking. Whatever text surrounds them will wrap to a new line if it would otherwise extend beyond the container boundary. With   it would wrap to a new line as a block even if the text before   could fit on the previous line.

Depending on your use case, that may be desired or undesired. For me, unless I'm dealing with things like names (John Doe), addresses or references (see eq. 5), breaking as a block is usually undesired.

Smart cast to 'Type' is impossible, because 'variable' is a mutable property that could have been changed by this time

How I would write it:

var left: Node? = null

fun show() {
     val left = left ?: return
     queue.add(left) // no error because we return if it is null
}

How to clear the logs properly for a Docker container?

Docker4Mac, a 2018 solution:

LOGPATH=$(docker inspect --format='{{.LogPath}}' <container_name_or_id>)
docker run -it --rm --privileged --pid=host alpine:latest nsenter -t 1 -m -u -n -i -- truncate -s0 $LOGPATH

The first line gets the log file path, similar to the accepted answer.

The second line uses nsenter that allows you to run commands in the xhyve VM that servers as the host for all the docker containers under Docker4Mac. The command we run is the familiar truncate -s0 $LOGPATH from non-Mac answers.

If you're using docker-compose, the first line becomes:

local LOGPATH=$(docker inspect --format='{{.LogPath}}' $(docker-compose ps -q <service>))

and <service> is the service name from your docker-compose.yml file.

Thanks to https://github.com/justincormack/nsenter1 for the nsenter trick.

how to display a javascript var in html body

<html>
<head>
<script type="text/javascript">
var number = 123;
var string = "abcd";

function docWrite(variable) {
    document.write(variable);
}
</script>
</head>

<body>
<h1>the value for number is: <script>docWrite(number)</script></h1>

<h2>the text is: <script>docWrite(string)</script> </h2>
</body>
</html>

You can shorten document.write but can't avoid <script> tag

@ViewChild in *ngIf

This could work but I don't know if it's convenient for your case:

@ViewChildren('contentPlaceholder', {read: ViewContainerRef}) viewContainerRefs: QueryList;

ngAfterViewInit() {
 this.viewContainerRefs.changes.subscribe(item => {
   if(this.viewContainerRefs.toArray().length) {
     // shown
   }
 })
}

Deep copy in ES6 using the spread syntax

From MDN

Note: Spread syntax effectively goes one level deep while copying an array. Therefore, it may be unsuitable for copying multidimensional arrays as the following example shows (it's the same with Object.assign() and spread syntax).

Personally, I suggest using Lodash's cloneDeep function for multi-level object/array cloning.

Here is a working example:

_x000D_

const arr1 = [{ 'a': 1 }];_x000D_
_x000D_
const arr2 = [...arr1];_x000D_
_x000D_
const arr3 = _.clone(arr1);_x000D_
_x000D_
const arr4 = arr1.slice();_x000D_
_x000D_
const arr5 = _.cloneDeep(arr1);_x000D_
_x000D_
const arr6 = [...{...arr1}]; // a bit ugly syntax but it is working!_x000D_
_x000D_
_x000D_
// first level_x000D_
console.log(arr1 === arr2); // false_x000D_
console.log(arr1 === arr3); // false_x000D_
console.log(arr1 === arr4); // false_x000D_
console.log(arr1 === arr5); // false_x000D_
console.log(arr1 === arr6); // false_x000D_
_x000D_
// second level_x000D_
console.log(arr1[0] === arr2[0]); // true_x000D_
console.log(arr1[0] === arr3[0]); // true_x000D_
console.log(arr1[0] === arr4[0]); // true_x000D_
console.log(arr1[0] === arr5[0]); // false_x000D_
console.log(arr1[0] === arr6[0]); // false

_x000D_

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.js"></script>

_x000D_

Index inside map() function

`Array.prototype.map()` index:

One can access the index Array.prototype.map() via the second argument of the callback function. Here is an example:

_x000D_

const array = [1, 2, 3, 4];_x000D_
_x000D_
_x000D_
const map = array.map((x, index) => {_x000D_
  console.log(index);_x000D_
  return x + index;_x000D_
});_x000D_
_x000D_
console.log(map);

_x000D_

Other arguments of `Array.prototype.map()`:

The third argument of the callback function exposes the array on which map was called upon
The second argument of Array.map() is a object which will be the this value for the callback function. Keep in mind that you have to use the regular function keyword in order to declare the callback since an arrow function doesn't have its own binding to the this keyword.

For example:

_x000D_

const array = [1, 2, 3, 4];_x000D_
_x000D_
const thisObj = {prop1: 1}_x000D_
_x000D_
_x000D_
const map = array.map( function (x, index, array) {_x000D_
  console.log(array);_x000D_
  console.log(this)_x000D_
}, thisObj);

_x000D_

How do I pass data to Angular routed components?

Angular 7.2.0 introduced new way of passing the data when navigating between routed components:

@Component({
  template: `<a (click)="navigateWithState()">Go</a>`,
})
export class AppComponent  {
  constructor(public router: Router) {}
  navigateWithState() {
    this.router.navigateByUrl('/123', { state: { hello: 'world' } });
  }
}

Or:

@Component({
  selector: 'my-app',
  template: `
  <a routerLink="/details" [state]="{ hello: 'world' }">Go</a>`,
})
export class AppComponent  {}

To read the state, you can access window.history.state property after the navigation has finished:

export class PageComponent implements OnInit {
  state$: Observable<object>;

  constructor(public activatedRoute: ActivatedRoute) {}

  ngOnInit() {
    this.state$ = this.activatedRoute.paramMap
      .pipe(map(() => window.history.state))
  }
}

better way to drop nan rows in pandas

bool_series=pd.notnull(dat["x"])
dat=dat[bool_series]

Angular 2 - NgFor using numbers instead collections

Use a pipe to transform the number to an array.

@Pipe({
  name: 'enumerate',
})
export class EnumeratePipe implements PipeTransform {
  transform(n: number): number[] {
    return [...Array(n)].map((_,i) => i);
  }
}

Then use the pipe in your template.

<p *ngFor="let i of 5 | enumerate">
   Index: {{ i }}
</p>

https://stackblitz.com/edit/angular-ivy-pkwvyw?file=src/app/app.component.html

How can I close a dropdown on click outside?

I've made a directive to address this similar problem and I'm using Bootstrap. But in my case, instead of waiting for the click event outside the element to close the current opened dropdown menu I think it is better if we watch over the 'mouseleave' event to automatically close the menu.

Here's my solution:

Directive

import { Directive, HostListener, HostBinding } from '@angular/core';
@Directive({
  selector: '[appDropdown]'
})
export class DropdownDirective {

  @HostBinding('class.open') isOpen = false;

  @HostListener('click') toggleOpen() {
    this.isOpen = !this.isOpen;
  }

  @HostListener('mouseleave') closeDropdown() {
    this.isOpen = false;
  }

}

HTML

<ul class="nav navbar-nav navbar-right">
    <li class="dropdown" appDropdown>
      <a class="dropdown-toggle" data-toggle="dropdown">Test <span class="caret"></span>
      </a>
      <ul class="dropdown-menu">
          <li routerLinkActive="active"><a routerLink="/test1">Test1</a></li>
          <li routerLinkActive="active"><a routerLink="/test2/">Test2</a></li>
      </ul>
    </li>
</ul>

Call async/await functions in parallel

You can await on Promise.all():

await Promise.all([someCall(), anotherCall()]);

To store the results:

let [someResult, anotherResult] = await Promise.all([someCall(), anotherCall()]);

Note that Promise.all fails fast, which means that as soon as one of the promises supplied to it rejects, then the entire thing rejects.

_x000D_

const happy = (v, ms) => new Promise((resolve) => setTimeout(() => resolve(v), ms))
const sad = (v, ms) => new Promise((_, reject) => setTimeout(() => reject(v), ms))

Promise.all([happy('happy', 100), sad('sad', 50)])
  .then(console.log).catch(console.log) // 'sad'

_x000D_

If, instead, you want to wait for all the promises to either fulfill or reject, then you can use Promise.allSettled. Note that Internet Explorer does not natively support this method.

_x000D_

const happy = (v, ms) => new Promise((resolve) => setTimeout(() => resolve(v), ms))
const sad = (v, ms) => new Promise((_, reject) => setTimeout(() => reject(v), ms))

Promise.allSettled([happy('happy', 100), sad('sad', 50)])
  .then(console.log) // [{ "status":"fulfilled", "value":"happy" }, { "status":"rejected", "reason":"sad" }]

_x000D_

Note: If you use Promise.all actions that managed to finish before rejection happen are not rolled back, so you may need to take care of such situation. For example if you have 5 actions, 4 quick, 1 slow and slow rejects. Those 4 actions may be already executed so you may need to roll back. In such situation consider using Promise.allSettled while it will provide exact detail which action failed and which not.

Comparing two arrays of objects, and exclude the elements who match values into new array in JS

Just using the Array iteration methods built into JS is fine for this:

_x000D_

var result1 = [_x000D_
    {id:1, name:'Sandra', type:'user', username:'sandra'},_x000D_
    {id:2, name:'John', type:'admin', username:'johnny2'},_x000D_
    {id:3, name:'Peter', type:'user', username:'pete'},_x000D_
    {id:4, name:'Bobby', type:'user', username:'be_bob'}_x000D_
];_x000D_
_x000D_
var result2 = [_x000D_
    {id:2, name:'John', email:'[email protected]'},_x000D_
    {id:4, name:'Bobby', email:'[email protected]'}_x000D_
];_x000D_
_x000D_
var props = ['id', 'name'];_x000D_
_x000D_
var result = result1.filter(function(o1){_x000D_
    // filter out (!) items in result2_x000D_
    return !result2.some(function(o2){_x000D_
        return o1.id === o2.id;          // assumes unique id_x000D_
    });_x000D_
}).map(function(o){_x000D_
    // use reduce to make objects with only the required properties_x000D_
    // and map to apply this to the filtered array as a whole_x000D_
    return props.reduce(function(newo, name){_x000D_
        newo[name] = o[name];_x000D_
        return newo;_x000D_
    }, {});_x000D_
});_x000D_
_x000D_
document.body.innerHTML = '<pre>' + JSON.stringify(result, null, 4) +_x000D_
        '</pre>';

_x000D_

If you are doing this a lot, then by all means look at external libraries to help you out, but it's worth learning the basics first, and the basics will serve you well here.

UIAlertView first deprecated IOS 9

-(void)showAlert{

    UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Title"
                                                                   message:"Message"
                                                            preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault
                                                          handler:^(UIAlertAction * action) {}];

    [alert addAction:defaultAction];
    [self presentViewController:alert animated:YES completion:nil];
}

[self showAlert]; // calling Method

Python - Get Yesterday's date as a string in YYYY-MM-DD format

>>> import datetime
>>> datetime.date.fromordinal(datetime.date.today().toordinal()-1).strftime("%F")
'2015-05-26'

Elegant way to create empty pandas DataFrame with NaN of type float

Hope this can help!

 pd.DataFrame(np.nan, index = np.arange(<num_rows>), columns = ['A'])

Using lodash to compare jagged arrays (items existence without order)

By 'the same' I mean that there are is no item in array1 that is not contained in array2.

You could use flatten() and difference() for this, which works well if you don't care if there are items in array2 that aren't in array1. It sounds like you're asking is array1 a subset of array2?

var array1 = [['a', 'b'], ['b', 'c']];
var array2 = [['b', 'c'], ['a', 'b']];

function isSubset(source, target) {
    return !_.difference(_.flatten(source), _.flatten(target)).length;
}

isSubset(array1, array2); // ? true
array1.push('d');
isSubset(array1, array2); // ? false
isSubset(array2, array1); // ? true

React / JSX Dynamic Component Name

If your components are global you can simply do:

_x000D_

var nameOfComponent = "SomeComponent";_x000D_
React.createElement(window[nameOfComponent], {});

_x000D_

JSON to TypeScript class instance?

You can now use Object.assign(target, ...sources). Following your example, you could use it like this:

class Foo {
  name: string;
  getName(): string { return this.name };
}

let fooJson: string = '{"name": "John Doe"}';
let foo: Foo = Object.assign(new Foo(), JSON.parse(fooJson));

console.log(foo.getName()); //returns John Doe

Object.assign is part of ECMAScript 2015 and is currently available in most modern browsers.

Slicing a dictionary

Write a dict subclass that accepts a list of keys as an "item" and returns a "slice" of the dictionary:

class SliceableDict(dict):
    default = None
    def __getitem__(self, key):
        if isinstance(key, list):   # use one return statement below
            # uses default value if a key does not exist
            return {k: self.get(k, self.default) for k in key}
            # raises KeyError if a key does not exist
            return {k: self[k] for k in key}
            # omits key if it does not exist
            return {k: self[k] for k in key if k in self}
        return dict.get(self, key)

Usage:

d = SliceableDict({1:2, 3:4, 5:6, 7:8})
d[[1, 5]]   # {1: 2, 5: 6}

Or if you want to use a separate method for this type of access, you can use * to accept any number of arguments:

class SliceableDict(dict):
    def slice(self, *keys):
        return {k: self[k] for k in keys}
        # or one of the others from the first example

d = SliceableDict({1:2, 3:4, 5:6, 7:8})
d.slice(1, 5)     # {1: 2, 5: 6}
keys = 1, 5
d.slice(*keys)    # same

enum to string in modern C++11 / C++14 / C++17 and future C++20

my solution is without macro usage.

advantages:

you see exactly what you do
access is with hash maps, so good for many valued enums
no need to consider order or non-consecutive values
both enum to string and string to enum translation, while added enum value must be added in one additional place only

disadvantages:

you need to replicate all the enums values as text
access in hash map must consider string case
maintenance if adding values is painful - must add in both enum and direct translate map

so... until the day that C++ implements the C# Enum.Parse functionality, I will be stuck with this:

            #include <unordered_map>

            enum class Language
            { unknown, 
                Chinese, 
                English, 
                French, 
                German
                // etc etc
            };

            class Enumerations
            {
            public:
                static void fnInit(void);

                static std::unordered_map <std::wstring, Language> m_Language;
                static std::unordered_map <Language, std::wstring> m_invLanguage;

            private:
                static void fnClear();
                static void fnSetValues(void);
                static void fnInvertValues(void);

                static bool m_init_done;
            };

            std::unordered_map <std::wstring, Language> Enumerations::m_Language = std::unordered_map <std::wstring, Language>();
            std::unordered_map <Language, std::wstring> Enumerations::m_invLanguage = std::unordered_map <Language, std::wstring>();

            void Enumerations::fnInit()
            {
                fnClear();
                fnSetValues();
                fnInvertValues();
            }

            void Enumerations::fnClear()
            {
                m_Language.clear();
                m_invLanguage.clear();
            }

            void Enumerations::fnSetValues(void)
            {   
                m_Language[L"unknown"] = Language::unknown;
                m_Language[L"Chinese"] = Language::Chinese;
                m_Language[L"English"] = Language::English;
                m_Language[L"French"] = Language::French;
                m_Language[L"German"] = Language::German;
                // and more etc etc
            }

            void Enumerations::fnInvertValues(void)
            {
                for (auto it = m_Language.begin(); it != m_Language.end(); it++)
                {
                    m_invLanguage[it->second] = it->first;
                }
            }

            // usage -
            //Language aLanguage = Language::English;
            //wstring sLanguage = Enumerations::m_invLanguage[aLanguage];

            //wstring sLanguage = L"French" ;
            //Language aLanguage = Enumerations::m_Language[sLanguage];

Refreshing data in RecyclerView and keeping its scroll position

If you have one or more EditTexts inside of a recyclerview items, disable the autofocus of these, putting this configuration in the parent view of recyclerview:

android:focusable="true"
android:focusableInTouchMode="true"

I had this issue when I started another activity launched from a recyclerview item, when I came back and set an update of one field in one item with notifyItemChanged(position) the scroll of RV moves, and my conclusion was that, the autofocus of EditText Items, the code above solved my issue.

best.

Multiple values in single-value context

Yes, there is.

Surprising, huh? You can get a specific value from a multiple return using a simple mute function:

package main

import "fmt"
import "strings"

func µ(a ...interface{}) []interface{} {
    return a
}

type A struct {
    B string
    C func()(string)
}

func main() {
    a := A {
        B:strings.TrimSpace(µ(E())[1].(string)),
        C:µ(G())[0].(func()(string)),
    }

    fmt.Printf ("%s says %s\n", a.B, a.C())
}

func E() (bool, string) {
    return false, "F"
}

func G() (func()(string), bool) {
    return func() string { return "Hello" }, true
}

https://play.golang.org/p/IwqmoKwVm-

Notice how you select the value number just like you would from a slice/array and then the type to get the actual value.

You can read more about the science behind that from this article. Credits to the author.

Determining if Swift dictionary contains key and obtaining any of its values

Why not simply check for dict.keys.contains(key)? Checking for dict[key] != nil will not work in cases where the value is nil. As with a dictionary [String: String?] for example.

Select subset of columns in data.table R

To subset by column index (to avoid typing their names) you can do

dt[, .SD, .SDcols = -c(1:3, 5L)]

result seems ok

            V4          V6         V7         V8         V9       V10
 1: 0.51500037 0.919066234 0.49447244 0.19564261 0.51945102 0.7238604
 2: 0.36477648 0.828889808 0.04564637 0.20265215 0.32255945 0.4483778
 3: 0.10853112 0.601278633 0.58363636 0.47807015 0.58061000 0.2584015
 4: 0.57569100 0.228642846 0.25734995 0.79528506 0.52067802 0.6644448
 5: 0.07873759 0.840349039 0.77798153 0.48699653 0.98281006 0.4480908
 6: 0.31347303 0.670762371 0.04591664 0.03428055 0.35916057 0.1297684
 7: 0.45374290 0.957848949 0.99383496 0.43939774 0.33470618 0.9429592
 8: 0.99403107 0.009750809 0.78816609 0.34713435 0.57937680 0.9227709
 9: 0.62776909 0.400467655 0.49433474 0.81536420 0.01637135 0.4942351
10: 0.10318372 0.177712847 0.27678497 0.59554454 0.29532020 0.7117959

R Language: How to print the first or last rows of a data set?

If you want to print the last 10 lines, use

tail(dataset, 10)

for the first 10, you could also do

head(dataset, 10)

python: get directory two levels up

I was going to add this just to be silly, but also because it shows newcomers the potential usefulness of aliasing functions and/or imports.

Having written it, I think this code is more readable (i.e. lower time to grasp intention) than the other answers to date, and readability is (usually) king.

from os.path import dirname as up

two_up = up(up(__file__))

Note: you only want to do this kind of thing if your module is very small, or contextually cohesive.

dplyr change many data types

From the bottom of the ?mutate_each (at least in dplyr 0.5) it looks like that function, as in @docendo discimus's answer, will be deprecated and replaced with more flexible alternatives mutate_if, mutate_all, and mutate_at. The one most similar to what @hadley mentions in his comment is probably using mutate_at. Note the order of the arguments is reversed, compared to mutate_each, and vars() uses select() like semantics, which I interpret to mean the ?select_helpers functions.

dat %>% mutate_at(vars(starts_with("fac")),funs(factor)) %>%   
  mutate_at(vars(starts_with("dbl")),funs(as.numeric))

But mutate_at can take column numbers instead of a vars() argument, and after reading through this page, and looking at the alternatives, I ended up using mutate_at but with grep to capture many different kinds of column names at once (unless you always have such obvious column names!)

dat %>% mutate_at(grep("^(fac|fctr|fckr)",colnames(.)),funs(factor)) %>%
  mutate_at(grep("^(dbl|num|qty)",colnames(.)),funs(as.numeric))

I was pretty excited about figuring out mutate_at + grep, because now one line can work on lots of columns.

EDIT - now I see matches() in among the select_helpers, which handles regex, so now I like this.

dat %>% mutate_at(vars(matches("fac|fctr|fckr")),funs(factor)) %>%
  mutate_at(vars(matches("dbl|num|qty")),funs(as.numeric))

Another generally-related comment - if you have all your date columns with matchable names, and consistent formats, this is powerful. In my case, this turns all my YYYYMMDD columns, which were read as numbers, into dates.

  mutate_at(vars(matches("_DT$")),funs(as.Date(as.character(.),format="%Y%m%d")))

How to test if a string contains one of the substrings in a list, in pandas?

One option is just to use the regex | character to try to match each of the substrings in the words in your Series s (still using str.contains).

You can construct the regex by joining the words in searchfor with |:

>>> searchfor = ['og', 'at']
>>> s[s.str.contains('|'.join(searchfor))]
0    cat
1    hat
2    dog
3    fog
dtype: object

As @AndyHayden noted in the comments below, take care if your substrings have special characters such as $ and ^ which you want to match literally. These characters have specific meanings in the context of regular expressions and will affect the matching.

You can make your list of substrings safer by escaping non-alphanumeric characters with re.escape:

>>> import re
>>> matches = ['$money', 'x^y']
>>> safe_matches = [re.escape(m) for m in matches]
>>> safe_matches
['\\$money', 'x\\^y']

The strings with in this new list will match each character literally when used with str.contains.

Appending to list in Python dictionary

dates_dict[key] = dates_dict.get(key, []).append(date) sets dates_dict[key] to None as list.append returns None.

In [5]: l = [1,2,3]

In [6]: var = l.append(3)

In [7]: print var
None

You should use collections.defaultdict

import collections
dates_dict = collections.defaultdict(list)

How to mount host volumes into docker containers in Dockerfile during build

If you are looking for a way to "mount" files, like -v for docker run, you can now use the --secret flag for docker build

echo 'WARMACHINEROX' > mysecret.txt
docker build --secret id=mysecret,src=mysecret.txt .

And inside your Dockerfile you can now access this secret

# syntax = docker/dockerfile:1.0-experimental
FROM alpine

# shows secret from default secret location:
RUN --mount=type=secret,id=mysecret cat /run/secrets/mysecret

# shows secret from custom secret location:
RUN --mount=type=secret,id=mysecret,dst=/foobar cat /foobar

More in-depth information about --secret available on Docker Docs

docker container ssl certificates

You can use relative path to mount the volume to container:

docker run -v `pwd`/certs:/container/path/to/certs ...

Note the back tick on the pwd which give you the present working directory. It assumes you have the certs folder in current directory that the docker run is executed. Kinda great for local development and keep the certs folder visible to your project.

Remove all constraints affecting a UIView

A Swift solution:

extension UIView {
  func removeAllConstraints() {
    var view: UIView? = self
    while let currentView = view {
      currentView.removeConstraints(currentView.constraints.filter {
        return $0.firstItem as? UIView == self || $0.secondItem as? UIView == self
      })
      view = view?.superview
    }
  }
}

It's important to go through all the parents, since the constraints between two elements are holds by the common ancestors, so just clearing the superview as detailed in this answer is not good enough, and you might end up having bad surprise later on.

Detect and exclude outliers in Pandas data frame

My function for dropping outliers

def drop_outliers(df, field_name):
    distance = 1.5 * (np.percentile(df[field_name], 75) - np.percentile(df[field_name], 25))
    df.drop(df[df[field_name] > distance + np.percentile(df[field_name], 75)].index, inplace=True)
    df.drop(df[df[field_name] < np.percentile(df[field_name], 25) - distance].index, inplace=True)

How do I run a spring boot executable jar in a Production environment?

If you are using gradle you can just add this to your build.gradle

springBoot {
    executable = true
}

You can then run your application by typing ./your-app.jar

Also, you can find a complete guide here to set up your app as a service

56.1.1 Installation as an init.d service (System V)

http://docs.spring.io/spring-boot/docs/current/reference/html/deployment-install.html

cheers

how to check the dtype of a column in python pandas

I know this is a bit of an old thread but with pandas 19.02, you can do:

df.select_dtypes(include=['float64']).apply(your_function)
df.select_dtypes(exclude=['string','object']).apply(your_other_function)

http://pandas.pydata.org/pandas-docs/version/0.19.2/generated/pandas.DataFrame.select_dtypes.html

Half circle with CSS (border, outline only)

I use a percentage method to achieve

        border: 3px solid rgb(1, 1, 1);
        border-top-left-radius: 100% 200%;
        border-top-right-radius: 100% 200%;

Laravel update model with unique validation rule for attribute

I am calling different validation classes for Store and Update. In my case I don't want to update every fields, so I have baseRules for common fields for Create and Edit. Add extra validation classes for each. I hope my example is helpful. I am using Laravel 4.

Model:

public static $baseRules = array(
    'first_name' => 'required',
    'last_name'  => 'required',
    'description' => 'required',
    'description2' => 'required',
    'phone'  => 'required | numeric',
    'video_link'  => 'required | url',
    'video_title'  => 'required | max:87',
    'video_description'  => 'required',
    'sex' => 'in:M,F,B',
    'title'  => 'required'
);

public static function validate($data)
{
    $createRule = static::$baseRules;
    $createRule['email'] = 'required | email | unique:musicians';
    $createRule['band'] = 'required | unique:musicians';
    $createRule['style'] = 'required';
    $createRule['instrument'] = 'required';
    $createRule['myFile'] = 'required | image';

    return Validator::make($data, $createRule);
}

public static function validateUpdate($data, $id)
{
    $updateRule = static::$baseRules;
    $updateRule['email'] = 'required | email | unique:musicians,email,' . $id;
    $updateRule['band'] = 'required | unique:musicians,band,' . $id;
    return Validator::make($data, $updateRule);
}

Controller: Store method:

public function store()
{
    $myInput = Input::all();
    $validation = Musician::validate($myInput);
    if($validation->fails())
    {
        $key = "errorMusician";
        return Redirect::to('musician/create')
        ->withErrors($validation, 'musicain')
        ->withInput();
    }
}

Update method:

public function update($id) 
{
    $myInput = Input::all();
    $validation = Musician::validateUpdate($myInput, $id);
    if($validation->fails())
    {
        $key = "error";
        $message = $validation->messages();
        return Redirect::to('musician/' . $id)
        ->withErrors($validation, 'musicain')
        ->withInput();
    }
}

pop/remove items out of a python tuple

say you have a dict with tuples as keys, e.g: labels = {(1,2,0): 'label_1'} you can modify the elements of the tuple keys as follows:

formatted_labels = {(elem[0],elem[1]):labels[elem] for elem in labels}

Here, we ignore the last elements.

Proper way to wait for one function to finish before continuing?

The only issue with promises is that IE doesn't support them. Edge does, but there's plenty of IE 10 and 11 out there: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise (compatibility at the bottom)

So, JavaScript is single-threaded. If you're not making an asynchronous call, it will behave predictably. The main JavaScript thread will execute one function completely before executing the next one, in the order they appear in the code. Guaranteeing order for synchronous functions is trivial - each function will execute completely in the order it was called.

Think of the synchronous function as an atomic unit of work. The main JavaScript thread will execute it fully, in the order the statements appear in the code.

But, throw in the asynchronous call, as in the following situation:

showLoadingDiv(); // function 1

makeAjaxCall(); // function 2 - contains async ajax call

hideLoadingDiv(); // function 3

This doesn't do what you want. It instantaneously executes function 1, function 2, and function 3. Loading div flashes and it's gone, while the ajax call is not nearly complete, even though makeAjaxCall() has returned. THE COMPLICATION is that makeAjaxCall() has broken its work up into chunks which are advanced little by little by each spin of the main JavaScript thread - it's behaving asychronously. But that same main thread, during one spin/run, executed the synchronous portions quickly and predictably.

So, the way I handled it: Like I said the function is the atomic unit of work. I combined the code of function 1 and 2 - I put the code of function 1 in function 2, before the asynch call. I got rid of function 1. Everything up to and including the asynchronous call executes predictably, in order.

THEN, when the asynchronous call completes, after several spins of the main JavaScript thread, have it call function 3. This guarantees the order. For example, with ajax, the onreadystatechange event handler is called multiple times. When it reports it's completed, then call the final function you want.

I agree it's messier. I like having code be symmetric, I like having functions do one thing (or close to it), and I don't like having the ajax call in any way be responsible for the display (creating a dependency on the caller). BUT, with an asynchronous call embedded in a synchronous function, compromises have to be made in order to guarantee order of execution. And I have to code for IE 10 so no promises.

Summary: For synchronous calls, guaranteeing order is trivial. Each function executes fully in the order it was called. For a function with an asynchronous call, the only way to guarantee order is to monitor when the async call completes, and call the third function when that state is detected.

For a discussion of JavaScript threads, see: https://medium.com/@francesco_rizzi/javascript-main-thread-dissected-43c85fce7e23 and https://developer.mozilla.org/en-US/docs/Web/JavaScript/EventLoop

Also, another similar, highly rated question on this subject: How should I call 3 functions in order to execute them one after the other?

how to get the base url in javascript

var baseTags = document.getElementsByTagName("base");
var basePath = baseTags.length ? 
    baseTags[ 0 ].href.substr( location.origin.length, 999 ) : 
    "";

bash string compare to multiple correct values

Instead of saying:

if [ "$cms" != "wordpress" && "$cms" != "meganto" && "$cms" != "typo3" ]; then

say:

if [[ "$cms" != "wordpress" && "$cms" != "meganto" && "$cms" != "typo3" ]]; then

You might also want to refer to Conditional Constructs.

Changing route doesn't scroll to top in the new page

Here is my (seemingly) robust, complete and (fairly) concise solution. It uses the minification compatible style (and the angular.module(NAME) access to your module).

angular.module('yourModuleName').run(["$rootScope", "$anchorScroll" , function ($rootScope, $anchorScroll) {
    $rootScope.$on("$locationChangeSuccess", function() {
                $anchorScroll();
    });
}]);

PS I found that the autoscroll thing had no effect whether set to true or false.

Rename multiple columns by names

Update dplyr 1.0.0

The newest dplyr version became more flexible by adding rename_with() where _with refers to a function as input. The trick is to reformulate the character vector newnames into a formula (by ~), so it would be equivalent to function(x) return (newnames).

In my subjective opinion, that is the most elegant dplyr expression.

# shortest & most elegant expression
df %>% rename_with(~ newnames, oldnames)

A w B
1 1 2 3

Side note:

If you reverse the order, argument .fn must be specified as .fn is expected before .cols argument.

df %>% rename_with(oldnames, .fn = ~ newnames)

A w B
1 1 2 3

Changing a specific column name in pandas DataFrame

pandas version 0.23.4

df.rename(index=str,columns={'old_name':'new_name'},inplace=True)

For the record:

omitting index=str will give error replace has an unexpected argument 'columns'

Adjust plot title (main) position

Try this:

par(adj = 0)
plot(1, 1, main = "Title")

or equivalent:

plot(1, 1, main = "Title", adj = 0)

adj = 0 produces left-justified text, 0.5 (the default) centered text and 1 right-justified text. Any value in [0, 1] is allowed.

However, the issue is that this will also change the position of the label of the x-axis and y-axis.

How to read from stdin line by line in Node

You can use the readline module to read from stdin line by line:

var readline = require('readline');
var rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  terminal: false
});

rl.on('line', function(line){
    console.log(line);
})

Pandas get topmost n records within each group

Since 0.14.1, you can now do nlargest and nsmallest on a groupby object:

In [23]: df.groupby('id')['value'].nlargest(2)
Out[23]: 
id   
1   2    3
    1    2
2   6    4
    5    3
3   7    1
4   8    1
dtype: int64

There's a slight weirdness that you get the original index in there as well, but this might be really useful depending on what your original index was.

If you're not interested in it, you can do .reset_index(level=1, drop=True) to get rid of it altogether.

(Note: From 0.17.1 you'll be able to do this on a DataFrameGroupBy too but for now it only works with Series and SeriesGroupBy.)

add a string prefix to each value in a string column using Pandas

As an alternative, you can also use an apply combined with format (or better with f-strings) which I find slightly more readable if one e.g. also wants to add a suffix or manipulate the element itself:

df = pd.DataFrame({'col':['a', 0]})

df['col'] = df['col'].apply(lambda x: "{}{}".format('str', x))

which also yields the desired output:

    col
0  stra
1  str0

If you are using Python 3.6+, you can also use f-strings:

df['col'] = df['col'].apply(lambda x: f"str{x}")

yielding the same output.

The f-string version is almost as fast as @RomanPekar's solution (python 3.6.4):

df = pd.DataFrame({'col':['a', 0]*200000})

%timeit df['col'].apply(lambda x: f"str{x}")
117 ms ± 451 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)

%timeit 'str' + df['col'].astype(str)
112 ms ± 1.04 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)

Using format, however, is indeed far slower:

%timeit df['col'].apply(lambda x: "{}{}".format('str', x))
185 ms ± 1.07 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)

Hibernate: best practice to pull all lazy collections

Place the Utils.objectToJson(entity); call before session closing.

Or you can try to set fetch mode and play with code like this

Session s = ...
DetachedCriteria dc = DetachedCriteria.forClass(MyEntity.class).add(Expression.idEq(id));
dc.setFetchMode("innerTable", FetchMode.EAGER);
Criteria c = dc.getExecutableCriteria(s);
MyEntity a = (MyEntity)c.uniqueResult();

Number of processors/cores in command line

If you need an os independent method, works across Windows and Linux. Use python

$ python -c 'import multiprocessing as m; print m.cpu_count()'
16

From an array of objects, extract value of a property as array

If you want to also support array-like objects, use Array.from (ES2015):

Array.from(arrayLike, x => x.foo);

The advantage it has over Array.prototype.map() method is the input can also be a Set:

let arrayLike = new Set([{foo: 1}, {foo: 2}, {foo: 3}]);

Entity Framework 6 Code first Default value

After @SedatKapanoglu comment, I am adding all my approach that works, because he was right, just using the fluent API does not work.

1- Create custom code generator and override Generate for a ColumnModel.

   public class ExtendedMigrationCodeGenerator : CSharpMigrationCodeGenerator
{

    protected override void Generate(ColumnModel column, IndentedTextWriter writer, bool emitName = false)
    {

        if (column.Annotations.Keys.Contains("Default"))
        {
            var value = Convert.ChangeType(column.Annotations["Default"].NewValue, column.ClrDefaultValue.GetType());
            column.DefaultValue = value;
        }


        base.Generate(column, writer, emitName);
    }

}

2- Assign the new code generator:

public sealed class Configuration : DbMigrationsConfiguration<Data.Context.EfSqlDbContext>
{
    public Configuration()
    {
        CodeGenerator = new ExtendedMigrationCodeGenerator();
        AutomaticMigrationsEnabled = false;
    }
}

3- Use fluent api to created the Annotation:

public static void Configure(DbModelBuilder builder){    
builder.Entity<Company>().Property(c => c.Status).HasColumnAnnotation("Default", 0);            
}

How to Create Multiple Where Clause Query Using Laravel Eloquent?

Be sure to apply any other filters to sub queries, otherwise the or might gather all records.

$query = Activity::whereNotNull('id');
$count = 0;
foreach ($this->Reporter()->get() as $service) {
        $condition = ($count == 0) ? "where" : "orWhere";
        $query->$condition(function ($query) use ($service) {
            $query->where('branch_id', '=', $service->branch_id)
                  ->where('activity_type_id', '=', $service->activity_type_id)
                  ->whereBetween('activity_date_time', [$this->start_date, $this->end_date]);
        });
    $count++;
}
return $query->get();

subsetting a Python DataFrame

Creating an Empty Dataframe with known Column Name:

Names = ['Col1','ActivityID','TransactionID']
df = pd.DataFrame(columns = Names)

Creating a dataframe from csv:

df = pd.DataFrame('...../file_name.csv')

Creating a dynamic filter to subset a dtaframe:

i = 12
df[df['ActivitiID'] <= i]

Creating a dynamic filter to subset required columns of dtaframe

df[df['ActivityID'] == i][['TransactionID','ActivityID']]

Twitter bootstrap 3 two columns full height

After experimenting with the code provided here: Bootstrap Tutorial

Here is another alternative using latest Bootstrap v3.0.2:

Markup:

<div id="headcontainer" class="container">
           <p>Your Header</p>    
</div>
<div id="maincontainer" class="container">
      <div class="row">
         <div class="col-xs-4"> 
            <p>Your Navigation</p> 
         </div>
         <div class="col-xs-8"> 
            <p>Your Content</p> 
         </div>
      </div>
</div>

Additional CSS:

#maincontainer, #headcontainer {
width: 100%;
}

#headcontainer {
background-color:#CCCC99; 
height: 150px
}

#maincontainer .row .col-xs-4{
background-color:gray; 
height:1000px
}

#maincontainer .row .col-xs-8{
background-color:green;
height: 1000px
}

Sample JSFiddle

Hope this helps anyone interested.

Spring CrudRepository findByInventoryIds(List<Long> inventoryIdList) - equivalent to IN clause

findByInventoryIdIn(List<Long> inventoryIdList) should do the trick.

The HTTP request parameter format would be like so:

Yes ?id=1,2,3
No  ?id=1&id=2&id=3

The complete list of JPA repository keywords can be found in the current documentation listing. It shows that IsIn is equivalent – if you prefer the verb for readability – and that JPA also supports NotIn and IsNotIn.

How to create a link for all mobile devices that opens google maps with a route starting at the current location, destinating a given place?

The URL syntax is the same regardless of the platform in use

String url = "https://www.google.com/maps/search/?api=1&query=" + latitude + ","+ 
longitude;

In Android or iOS the URL launches Google Maps in the Maps app, If the Google Maps app is not installed, the URL launches Google Maps in a browser and performs the requested action.

On any other device, the URL launches Google Maps in a browser and performs the requested action.

here's the link for official documentation https://developers.google.com/maps/documentation/urls/guide

Print raw string from variable? (not getting the answers)

i wrote a small function.. but works for me

def conv(strng):
    k=strng
    k=k.replace('\a','\\a')
    k=k.replace('\b','\\b')
    k=k.replace('\f','\\f')
    k=k.replace('\n','\\n')
    k=k.replace('\r','\\r')
    k=k.replace('\t','\\t')
    k=k.replace('\v','\\v')
    return k

Efficiently checking if arbitrary object is NaN in Python / numpy / pandas?

pandas.isnull() (also pd.isna(), in newer versions) checks for missing values in both numeric and string/object arrays. From the documentation, it checks for:

NaN in numeric arrays, None/NaN in object arrays

Quick example:

import pandas as pd
import numpy as np
s = pd.Series(['apple', np.nan, 'banana'])
pd.isnull(s)
Out[9]: 
0    False
1     True
2    False
dtype: bool

The idea of using numpy.nan to represent missing values is something that pandas introduced, which is why pandas has the tools to deal with it.

Datetimes too (if you use pd.NaT you won't need to specify the dtype)

In [24]: s = Series([Timestamp('20130101'),np.nan,Timestamp('20130102 9:30')],dtype='M8[ns]')

In [25]: s
Out[25]: 
0   2013-01-01 00:00:00
1                   NaT
2   2013-01-02 09:30:00
dtype: datetime64[ns]``

In [26]: pd.isnull(s)
Out[26]: 
0    False
1     True
2    False
dtype: bool

Get the time difference between two datetimes

To get the difference between two-moment format dates or javascript Date format indifference of minutes the most optimum solution is

const timeDiff = moment.duration((moment(apptDetails.end_date_time).diff(moment(apptDetails.date_time)))).asMinutes()

you can change the difference format as you need by just replacing the asMinutes() function

Multiplying across in a numpy array

Normal multiplication like you showed:

>>> import numpy as np
>>> m = np.array([[1,2,3],[4,5,6],[7,8,9]])
>>> c = np.array([0,1,2])
>>> m * c
array([[ 0,  2,  6],
       [ 0,  5, 12],
       [ 0,  8, 18]])

If you add an axis, it will multiply the way you want:

>>> m * c[:, np.newaxis]
array([[ 0,  0,  0],
       [ 4,  5,  6],
       [14, 16, 18]])

You could also transpose twice:

>>> (m.T * c).T
array([[ 0,  0,  0],
       [ 4,  5,  6],
       [14, 16, 18]])

Bootstrap 3 Collapse show state with Chevron icon

Angular seems to cause issues with the JavaScript-based approaches here ( at least the ones I've tried ) . I found this solution here: http://www.codeproject.com/Articles/987311/Collapsible-Responsive-Master-Child-Grid-Using-Ang . The gist of it is to use data-ng-click on the toggle button and make the method to change the button in the controller using the $scope context .

I guess I could provide more detail... my buttons are set to the glyphicon of the initial state of the div they collapse ( glyphicon-chevron-right == collapsed div ) .

page.html:

<div class="title-1">
    <button data-toggle="collapse" data-target="#panel-{{ p_idx }}" class="dropdown-toggle title-btn glyphicon glyphicon-chevron-right" data-ng-click="collapse($event)"></button>
</div>
<div id="panel-{{ p_idx }}" class="collapse sect">
    ...
</div>

controllers.js:

.controller('PageController', function($scope, $rootScope) {
    $scope.collapse = function (event) {
        $(event.target).toggleClass("glyphicon-chevron-down glyphicon-chevron-right");
    };
)

How to hide command output in Bash

You should not use bash in this case to get rid of the output. Yum does have an option -q which suppresses the output.

You'll most certainly also want to use -y

echo "Installing nano..."
yum -y -q install nano

To see all the options for yum, use man yum.

SQL Server : Columns to Rows

DECLARE @TableName varchar(max)=NULL
SELECT @TableName=COALESCE(@TableName+',','')+t.TABLE_CATALOG+'.'+ t.TABLE_SCHEMA+'.'+o.Name
  FROM sysindexes AS i
  INNER JOIN sysobjects AS o ON i.id = o.id
  INNER JOIN INFORMATION_SCHEMA.TABLES T ON T.TABLE_NAME=o.name
 WHERE i.indid < 2
  AND OBJECTPROPERTY(o.id,'IsMSShipped') = 0
  AND i.rowcnt >350
  AND o.xtype !='TF'
 ORDER BY o.name ASC

 print @tablename

You can get list of tables which has rowcounts >350 . You can see at the solution list of table as row.

SQL Query - SUM(CASE WHEN x THEN 1 ELSE 0) for multiple columns

I think you should make a subquery to do grouping. In this case inner subquery returns few rows and you don't need a CASE statement. So I think this is going to be faster:

select Detail.ReceiptDate AS 'DATE',
       SUM(TotalMailed),
       SUM(TotalReturnMail),
       SUM(TraceReturnedMail)

from
(

select SentDate AS 'ReceiptDate', 
       count('TotalMailed') AS TotalMailed, 
       0 as TotalReturnMail, 
       0 as TraceReturnedMail
from MailDataExtract
where sentdate is not null
GROUP BY SentDate

UNION ALL
select MDE.ReturnMailDate AS 'ReceiptDate', 
       0 AS TotalMailed, 
       count(TotalReturnMail) as TotalReturnMail, 
       0 as TraceReturnedMail
from MailDataExtract MDE
where MDE.ReturnMailDate is not null
GROUP BY  MDE.ReturnMailDate

UNION ALL

select MDE.ReturnMailDate AS 'ReceiptDate', 
       0 AS TotalMailed, 
       0 as TotalReturnMail, 
       count(TraceReturnedMail) as TraceReturnedMail

from MailDataExtract MDE
    inner join DTSharedData.dbo.ScanData SD 
        ON SD.ScanDataID = MDE.ReturnScanDataID
   where MDE.ReturnMailDate is not null AND SD.ReturnMailTypeID = 1
GROUP BY MDE.ReturnMailDate

) as Detail
GROUP BY Detail.ReceiptDate
ORDER BY 1

for or while loop to do something n times

but on the other hand it creates a completely useless list of integers just to loop over them. Isn't it a waste of memory, especially as far as big numbers of iterations are concerned?

That is what xrange(n) is for. It avoids creating a list of numbers, and instead just provides an iterator object.

In Python 3, xrange() was renamed to range() - if you want a list, you have to specifically request it via list(range(n)).

Replacing NULL and empty string within Select statement

Try this

COALESCE(NULLIF(Address.COUNTRY,''), 'United States')

How do I convert date/time from 24-hour format to 12-hour AM/PM?

Use smaller h

// 24 hrs 
H:i 
// output 14:20

// 12 hrs 
h:i 
// output 2:20

Are nested try/except blocks in Python a good programming practice?

According to the documentation, it is better to handle multiple exceptions through tuples or like this:

import sys

try:
    f = open('myfile.txt')
    s = f.readline()
    i = int(s.strip())
except IOError as e:
    print "I/O error({0}): {1}".format(e.errno, e.strerror)
except ValueError:
    print "Could not convert data to an integer."
except:
    print "Unexpected error: ", sys.exc_info()[0]
    raise

How to convert the time from AM/PM to 24 hour format in PHP?

Try with this

echo date("G:i", strtotime($time));

or you can try like this also

echo date("H:i", strtotime("04:25 PM"));

How to send a “multipart/form-data” POST in Android with Volley

Complete Multipart Request with Upload Progress

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.util.CharsetUtils;

import com.android.volley.AuthFailureError;
import com.android.volley.NetworkResponse;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyLog;
import com.beusoft.app.AppContext;

public class MultipartRequest extends Request<String> {

    MultipartEntityBuilder entity = MultipartEntityBuilder.create();
    HttpEntity httpentity;
    private String FILE_PART_NAME = "files";

    private final Response.Listener<String> mListener;
    private final File mFilePart;
    private final Map<String, String> mStringPart;
    private Map<String, String> headerParams;
    private final MultipartProgressListener multipartProgressListener;
    private long fileLength = 0L;

    public MultipartRequest(String url, Response.ErrorListener errorListener,
            Response.Listener<String> listener, File file, long fileLength,
            Map<String, String> mStringPart,
            final Map<String, String> headerParams, String partName,
            MultipartProgressListener progLitener) {
        super(Method.POST, url, errorListener);

        this.mListener = listener;
        this.mFilePart = file;
        this.fileLength = fileLength;
        this.mStringPart = mStringPart;
        this.headerParams = headerParams;
        this.FILE_PART_NAME = partName;
        this.multipartProgressListener = progLitener;

        entity.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
        try {
            entity.setCharset(CharsetUtils.get("UTF-8"));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        buildMultipartEntity();
        httpentity = entity.build();
    }

    // public void addStringBody(String param, String value) {
    // if (mStringPart != null) {
    // mStringPart.put(param, value);
    // }
    // }

    private void buildMultipartEntity() {
        entity.addPart(FILE_PART_NAME, new FileBody(mFilePart, ContentType.create("image/gif"), mFilePart.getName()));
        if (mStringPart != null) {
            for (Map.Entry<String, String> entry : mStringPart.entrySet()) {
                entity.addTextBody(entry.getKey(), entry.getValue());
            }
        }
    }

    @Override
    public String getBodyContentType() {
        return httpentity.getContentType().getValue();
    }

    @Override
    public byte[] getBody() throws AuthFailureError {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        try {
            httpentity.writeTo(new CountingOutputStream(bos, fileLength,
                    multipartProgressListener));
        } catch (IOException e) {
            VolleyLog.e("IOException writing to ByteArrayOutputStream");
        }
        return bos.toByteArray();
    }

    @Override
    protected Response<String> parseNetworkResponse(NetworkResponse response) {

        try {
//          System.out.println("Network Response "+ new String(response.data, "UTF-8"));
            return Response.success(new String(response.data, "UTF-8"),
                    getCacheEntry());
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            // fuck it, it should never happen though
            return Response.success(new String(response.data), getCacheEntry());
        }
    }

    @Override
    protected void deliverResponse(String response) {
        mListener.onResponse(response);
    }

//Override getHeaders() if you want to put anything in header

    public static interface MultipartProgressListener {
        void transferred(long transfered, int progress);
    }

    public static class CountingOutputStream extends FilterOutputStream {
        private final MultipartProgressListener progListener;
        private long transferred;
        private long fileLength;

        public CountingOutputStream(final OutputStream out, long fileLength,
                final MultipartProgressListener listener) {
            super(out);
            this.fileLength = fileLength;
            this.progListener = listener;
            this.transferred = 0;
        }

        public void write(byte[] b, int off, int len) throws IOException {
            out.write(b, off, len);
            if (progListener != null) {
                this.transferred += len;
                int prog = (int) (transferred * 100 / fileLength);
                this.progListener.transferred(this.transferred, prog);
            }
        }

        public void write(int b) throws IOException {
            out.write(b);
            if (progListener != null) {
                this.transferred++;
                int prog = (int) (transferred * 100 / fileLength);
                this.progListener.transferred(this.transferred, prog);
            }
        }

    }
}

Sample Usage

protected <T> void uploadFile(final String tag, final String url,
            final File file, final String partName,         
            final Map<String, String> headerParams,
            final Response.Listener<String> resultDelivery,
            final Response.ErrorListener errorListener,
            MultipartProgressListener progListener) {
        AZNetworkRetryPolicy retryPolicy = new AZNetworkRetryPolicy();

        MultipartRequest mr = new MultipartRequest(url, errorListener,
                resultDelivery, file, file.length(), null, headerParams,
                partName, progListener);

        mr.setRetryPolicy(retryPolicy);
        mr.setTag(tag);

        Volley.newRequestQueue(this).add(mr);

    }

Bootstrap combining rows (rowspan)

Note: This was for Bootstrap 2 (relevant when the question was asked).

You can accomplish this by using row-fluid to make a fluid (percentage) based row inside an existing block.

<div class="row">
   <div class="span5">span5</div>
   <div class="span3">span3</div>
   <div class="span2">
      <div class="row-fluid">
         <div class="span12">span2</div>
         <div class="span12">span2</div>
      </div>
   </div>
   <div class="span2">span2</div>
</div>
<div class="row">
   <div class="span6">
      <div class="row-fluid">
         <div class="span12">span6</div>
         <div class="span12">span6</div>
      </div>
   </div>
   <div class="span6">span6</div>
</div>

Here's a JSFiddle example.

I did notice that there was an odd left margin that appears (or does not appear) for the spans inside of the row-fluid after the first one. This can be fixed with a small CSS tweak (it's the same CSS that is applied to the first child, expanded to those past the first child):

.row-fluid [class*="span"] {
    margin-left: 0;
}

Keep only date part when using pandas.to_datetime

While I upvoted EdChum's answer, which is the most direct answer to the question the OP posed, it does not really solve the performance problem (it still relies on python datetime objects, and hence any operation on them will be not vectorized - that is, it will be slow).

A better performing alternative is to use df['dates'].dt.floor('d'). Strictly speaking, it does not "keep only date part", since it just sets the time to 00:00:00. But it does work as desired by the OP when, for instance:

printing to screen
saving to csv
using the column to groupby

... and it is much more efficient, since the operation is vectorized.

EDIT: in fact, the answer the OP's would have preferred is probably "recent versions of pandas do not write the time to csv if it is 00:00:00 for all observations".

How to check a channel is closed or not without reading it?

I know this answer is so late, I have wrote this solution, Hacking Go run-time, It's not safety, It may crashes:

import (
    "unsafe"
    "reflect"
)


func isChanClosed(ch interface{}) bool {
    if reflect.TypeOf(ch).Kind() != reflect.Chan {
        panic("only channels!")
    }
    
    // get interface value pointer, from cgo_export 
    // typedef struct { void *t; void *v; } GoInterface;
    // then get channel real pointer
    cptr := *(*uintptr)(unsafe.Pointer(
        unsafe.Pointer(uintptr(unsafe.Pointer(&ch)) + unsafe.Sizeof(uint(0))),
    ))
    
    // this function will return true if chan.closed > 0
    // see hchan on https://github.com/golang/go/blob/master/src/runtime/chan.go 
    // type hchan struct {
    // qcount   uint           // total data in the queue
    // dataqsiz uint           // size of the circular queue
    // buf      unsafe.Pointer // points to an array of dataqsiz elements
    // elemsize uint16
    // closed   uint32
    // **
    
    cptr += unsafe.Sizeof(uint(0))*2
    cptr += unsafe.Sizeof(unsafe.Pointer(uintptr(0)))
    cptr += unsafe.Sizeof(uint16(0))
    return *(*uint32)(unsafe.Pointer(cptr)) > 0
}

Create dataframe from a matrix

melt() from the reshape2 package gets you close ...

library(reshape2)
(res <- melt(as.data.frame(mat), id="time"))
#   time variable value
# 1  0.0      C_0   0.1
# 2  0.5      C_0   0.2
# 3  1.0      C_0   0.3
# 4  0.0      C_1   0.3
# 5  0.5      C_1   0.4
# 6  1.0      C_1   0.5

... although you may want to post-process its results to get your preferred column names and ordering.

setNames(res[c("variable", "time", "value")], c("name", "time", "val"))
#   name time val
# 1  C_0  0.0 0.1
# 2  C_0  0.5 0.2
# 3  C_0  1.0 0.3
# 4  C_1  0.0 0.3
# 5  C_1  0.5 0.4
# 6  C_1  1.0 0.5

Calculate mean across dimension in a 2D array

If you do this a lot, NumPy is the way to go.

If for some reason you can't use NumPy:

>>> map(lambda x:sum(x)/float(len(x)), zip(*a))
[45.0, 10.5]

Show pop-ups the most elegant way

Angular-ui comes with dialog directive.Use it and set templateurl to whatever page you want to include.That is the most elegant way and i have used it in my project as well. You can pass several other parameters for dialog as per need.

Can I set max_retries for requests.request?

Be careful, Martijn Pieters's answer isn't suitable for version 1.2.1+. You can't set it globally without patching the library.

You can do this instead:

import requests
from requests.adapters import HTTPAdapter

s = requests.Session()
s.mount('http://www.github.com', HTTPAdapter(max_retries=5))
s.mount('https://www.github.com', HTTPAdapter(max_retries=5))

How to skip a iteration/loop in while-loop

while (rs.next())
{
  if (f.exists() && !f.isDirectory())
    continue;

  //proceed
}

making matplotlib scatter plots from dataframes in Python's pandas

Try passing columns of the DataFrame directly to matplotlib, as in the examples below, instead of extracting them as numpy arrays.

df = pd.DataFrame(np.random.randn(10,2), columns=['col1','col2'])
df['col3'] = np.arange(len(df))**2 * 100 + 100

In [5]: df
Out[5]: 
       col1      col2  col3
0 -1.000075 -0.759910   100
1  0.510382  0.972615   200
2  1.872067 -0.731010   500
3  0.131612  1.075142  1000
4  1.497820  0.237024  1700

Vary scatter point size based on another column

plt.scatter(df.col1, df.col2, s=df.col3)
# OR (with pandas 0.13 and up)
df.plot(kind='scatter', x='col1', y='col2', s=df.col3)

enter image description here

Vary scatter point color based on another column

colors = np.where(df.col3 > 300, 'r', 'k')
plt.scatter(df.col1, df.col2, s=120, c=colors)
# OR (with pandas 0.13 and up)
df.plot(kind='scatter', x='col1', y='col2', s=120, c=colors)

enter image description here

Scatter plot with legend

However, the easiest way I've found to create a scatter plot with legend is to call plt.scatter once for each point type.

cond = df.col3 > 300
subset_a = df[cond].dropna()
subset_b = df[~cond].dropna()
plt.scatter(subset_a.col1, subset_a.col2, s=120, c='b', label='col3 > 300')
plt.scatter(subset_b.col1, subset_b.col2, s=60, c='r', label='col3 <= 300') 
plt.legend()

enter image description here

Update

From what I can tell, matplotlib simply skips points with NA x/y coordinates or NA style settings (e.g., color/size). To find points skipped due to NA, try the isnull method: df[df.col3.isnull()]

To split a list of points into many types, take a look at numpy select, which is a vectorized if-then-else implementation and accepts an optional default value. For example:

df['subset'] = np.select([df.col3 < 150, df.col3 < 400, df.col3 < 600],
                         [0, 1, 2], -1)
for color, label in zip('bgrm', [0, 1, 2, -1]):
    subset = df[df.subset == label]
    plt.scatter(subset.col1, subset.col2, s=120, c=color, label=str(label))
plt.legend()

enter image description here

How to select rows with one or more nulls from a pandas DataFrame without listing columns explicitly?

.any() and .all() are great for the extreme cases, but not when you're looking for a specific number of null values. Here's an extremely simple way to do what I believe you're asking. It's pretty verbose, but functional.

import pandas as pd
import numpy as np

# Some test data frame
df = pd.DataFrame({'num_legs':          [2, 4,      np.nan, 0, np.nan],
                   'num_wings':         [2, 0,      np.nan, 0, 9],
                   'num_specimen_seen': [10, np.nan, 1,     8, np.nan]})

# Helper : Gets NaNs for some row
def row_nan_sums(df):
    sums = []
    for row in df.values:
        sum = 0
        for el in row:
            if el != el: # np.nan is never equal to itself. This is "hacky", but complete.
                sum+=1
        sums.append(sum)
    return sums

# Returns a list of indices for rows with k+ NaNs
def query_k_plus_sums(df, k):
    sums = row_nan_sums(df)
    indices = []
    i = 0
    for sum in sums:
        if (sum >= k):
            indices.append(i)
        i += 1
    return indices

# test
print(df)
print(query_k_plus_sums(df, 2))

Output

   num_legs  num_wings  num_specimen_seen
0       2.0        2.0               10.0
1       4.0        0.0                NaN
2       NaN        NaN                1.0
3       0.0        0.0                8.0
4       NaN        9.0                NaN
[2, 4]

Then, if you're like me and want to clear those rows out, you just write this:

# drop the rows from the data frame
df.drop(query_k_plus_sums(df, 2),inplace=True)
# Reshuffle up data (if you don't do this, the indices won't reset)
df = df.sample(frac=1).reset_index(drop=True)
# print data frame
print(df)

Output:

   num_legs  num_wings  num_specimen_seen
0       4.0        0.0                NaN
1       0.0        0.0                8.0
2       2.0        2.0               10.0

How to remove all numbers from string?

Regex

   $words = preg_replace('#[0-9 ]*#', '', $words);

HTML&CSS + Twitter Bootstrap: full page layout or height 100% - Npx

I've found a post here on Stackoverflow and implemented your design:

http://jsfiddle.net/bKsad/25/

Here's the original post: https://stackoverflow.com/a/5768262/1368423

Is that what you're looking for?

HTML:

<div class="container-fluid wrapper">

  <div class="row-fluid columns content"> 

    <div class="span2 article-tree">
      navigation column
    </div>

    <div class="span10 content-area">
      content column 
    </div>
  </div>

  <div class="footer">
     footer content
  </div>
</div>

CSS:

html, body {
    height: 100%;
}
.container-fluid {
    margin: 0 auto;
    height: 100%;
    padding: 20px 0;

    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

.columns {
    background-color: #C9E6FF;
    height: 100%;   
}

.content-area, .article-tree{
    background: #bada55;
    overflow:auto;
    height: 100%;
}

.footer {
    background: red;
    height: 20px;
}

How do you run a command for each line of a file?

If you know you don't have any whitespace in the input:

xargs chmod 755 < file.txt

If there might be whitespace in the paths, and if you have GNU xargs:

tr '\n' '\0' < file.txt | xargs -0 chmod 755

Python concatenate text files

If you have a lot of files in the directory then glob2 might be a better option to generate a list of filenames rather than writing them by hand.

import glob2

filenames = glob2.glob('*.txt')  # list of all .txt files in the directory

with open('outfile.txt', 'w') as f:
    for file in filenames:
        with open(file) as infile:
            f.write(infile.read()+'\n')

Python: Find index of minimum item in list of floats

You're effectively scanning the list once to find the min value, then scanning it again to find the index, you can do both in one go:

from operator import itemgetter
min(enumerate(a), key=itemgetter(1))[0]

printf not printing on console

You could try writing to stderr, rather than stdout.

fprintf(stderr, "Hello, please enter your age\n");

You should also have a look at this relevant thread.

How to Set Variables in a Laravel Blade Template

I'm going to extend the answer given by @Pim.

Add this to the boot method of your AppServiceProvider

<?php
/*
|--------------------------------------------------------------------------
| Extend blade so we can define a variable
| <code>
| @set(name, value)
| </code>
|--------------------------------------------------------------------------
*/

Blade::directive('set', function($expression) {
    list($name, $val) = explode(',', $expression);
    return "<?php {$name} = {$val}; ?>";
});

This way you don't expose the ability to write any php expression.

You can use this directive like:

@set($var, 10)
@set($var2, 'some string')

Function in JavaScript that can be called only once

UnderscoreJs has a function that does that, underscorejs.org/#once

  // Returns a function that will be executed at most one time, no matter how
  // often you call it. Useful for lazy initialization.
  _.once = function(func) {
    var ran = false, memo;
    return function() {
      if (ran) return memo;
      ran = true;
      memo = func.apply(this, arguments);
      func = null;
      return memo;
    };
  };

How to 'bulk update' with Django?

Update:

Django 2.2 version now has a bulk_update.

Old answer:

Refer to the following django documentation section

Updating multiple objects at once

In short you should be able to use:

ModelClass.objects.filter(name='bar').update(name="foo")

You can also use F objects to do things like incrementing rows:

from django.db.models import F
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)

See the documentation.

However, note that:

This won't use ModelClass.save method (so if you have some logic inside it won't be triggered).
No django signals will be emitted.
You can't perform an .update() on a sliced QuerySet, it must be on an original QuerySet so you'll need to lean on the .filter() and .exclude() methods.

Expand and collapse with angular js

See http://angular-ui.github.io/bootstrap/#/collapse

function CollapseDemoCtrl($scope) {
  $scope.isCollapsed = false;
}



<div ng-controller="CollapseDemoCtrl">
    <button class="btn" ng-click="isCollapsed = !isCollapsed">Toggle collapse</button>
    <hr>
    <div collapse="isCollapsed">
        <div class="well well-large">Some content</div> 
    </div>
</div>

Directory.GetFiles: how to get only filename, not full path?

Have a look at using FileInfo.Name Property

something like

string[] files = Directory.GetFiles(dir); 

for (int iFile = 0; iFile < files.Length; iFile++)
    string fn = new FileInfo(files[iFile]).Name;

Also have a look at using DirectoryInfo Class and FileInfo Class

How to print spaces in Python?

this is how to print whitespaces in python.

import string  
string.whitespace  
'\t\n\x0b\x0c\r '   
i.e .   
print "hello world"   
print "Hello%sworld"%' '   
print "hello", "world"   
print "Hello "+"world

Assert an object is a specific type

Solution for JUnit 5

The documentation says:

However, JUnit Jupiter’s org.junit.jupiter.Assertions class does not provide an assertThat() method like the one found in JUnit 4’s org.junit.Assert class which accepts a Hamcrest Matcher. Instead, developers are encouraged to use the built-in support for matchers provided by third-party assertion libraries.

Example for Hamcrest:

import static org.hamcrest.CoreMatchers.instanceOf;
import static org.hamcrest.MatcherAssert.assertThat;

import org.junit.jupiter.api.Test;

class HamcrestAssertionDemo {

    @Test
    void assertWithHamcrestMatcher() {
        SubClass subClass = new SubClass();
        assertThat(subClass, instanceOf(BaseClass.class));
    }

}

Example for AssertJ:

import static org.assertj.core.api.Assertions.assertThat;

import org.junit.jupiter.api.Test;

class AssertJDemo {

    @Test
    void assertWithAssertJ() {
        SubClass subClass = new SubClass();
        assertThat(subClass).isInstanceOf(BaseClass.class);
    }

}

Note that this assumes you want to test behaviors similar to instanceof (which accepts subclasses). If you want exact equal type, I don’t see a better way than asserting the two class to be equal like you mentioned in the question.

Extracting substrings in Go

It looks like you're confused by the working of slices and the string storage format, which is different from what you have in C.

any slice in Go stores the length (in bytes), so you don't have to care about the cost of the len operation : there is no need to count
Go strings aren't null terminated, so you don't have to remove a null byte, and you don't have to add 1 after slicing by adding an empty string.

To remove the last char (if it's a one byte char), simply do

inputFmt:=input[:len(input)-1]

How do I compare version numbers in Python?

The way that setuptools does it, it uses the pkg_resources.parse_version function. It should be PEP440 compliant.

Example:

#! /usr/bin/python
# -*- coding: utf-8 -*-
"""Example comparing two PEP440 formatted versions
"""
import pkg_resources

VERSION_A = pkg_resources.parse_version("1.0.1-beta.1")
VERSION_B = pkg_resources.parse_version("v2.67-rc")
VERSION_C = pkg_resources.parse_version("2.67rc")
VERSION_D = pkg_resources.parse_version("2.67rc1")
VERSION_E = pkg_resources.parse_version("1.0.0")

print(VERSION_A)
print(VERSION_B)
print(VERSION_C)
print(VERSION_D)

print(VERSION_A==VERSION_B) #FALSE
print(VERSION_B==VERSION_C) #TRUE
print(VERSION_C==VERSION_D) #FALSE
print(VERSION_A==VERSION_E) #FALSE

How to respond to clicks on a checkbox in an AngularJS directive?

This is the way I've been doing this sort of stuff. Angular tends to favor declarative manipulation of the dom rather than a imperative one(at least that's the way I've been playing with it).

The markup

<table class="table">
  <thead>
    <tr>
      <th>
        <input type="checkbox" 
          ng-click="selectAll($event)"
          ng-checked="isSelectedAll()">
      </th>
      <th>Title</th>
    </tr>
  </thead>
  <tbody>
    <tr ng-repeat="e in entities" ng-class="getSelectedClass(e)">
      <td>
        <input type="checkbox" name="selected"
          ng-checked="isSelected(e.id)"
          ng-click="updateSelection($event, e.id)">
      </td>
      <td>{{e.title}}</td>
    </tr>
  </tbody>
</table>

And in the controller

var updateSelected = function(action, id) {
  if (action === 'add' && $scope.selected.indexOf(id) === -1) {
    $scope.selected.push(id);
  }
  if (action === 'remove' && $scope.selected.indexOf(id) !== -1) {
    $scope.selected.splice($scope.selected.indexOf(id), 1);
  }
};

$scope.updateSelection = function($event, id) {
  var checkbox = $event.target;
  var action = (checkbox.checked ? 'add' : 'remove');
  updateSelected(action, id);
};

$scope.selectAll = function($event) {
  var checkbox = $event.target;
  var action = (checkbox.checked ? 'add' : 'remove');
  for ( var i = 0; i < $scope.entities.length; i++) {
    var entity = $scope.entities[i];
    updateSelected(action, entity.id);
  }
};

$scope.getSelectedClass = function(entity) {
  return $scope.isSelected(entity.id) ? 'selected' : '';
};

$scope.isSelected = function(id) {
  return $scope.selected.indexOf(id) >= 0;
};

//something extra I couldn't resist adding :)
$scope.isSelectedAll = function() {
  return $scope.selected.length === $scope.entities.length;
};

EDIT: getSelectedClass() expects the entire entity but it was being called with the id of the entity only, which is now corrected

how to remove empty strings from list, then remove duplicate values from a list

Amiram Korach solution is indeed tidy. Here's an alternative for the sake of versatility.

var count = dtList.Count;
// Perform a reverse tracking.
for (var i = count - 1; i > -1; i--)
{
    if (dtList[i]==string.Empty) dtList.RemoveAt(i);
}
// Keep only the unique list items.
dtList = dtList.Distinct().ToList();

Select rows from a data frame based on values in a vector

Another option would be to use a keyed data.table:

library(data.table)
setDT(dt, key = 'fct')[J(vc)]  # or: setDT(dt, key = 'fct')[.(vc)]

which results in:

   fct X
1:   a 2
2:   a 7
3:   a 1
4:   c 3
5:   c 5
6:   c 9
7:   c 2
8:   c 4

What this does:

setDT(dt, key = 'fct') transforms the data.frame to a data.table (which is an enhanced form of a data.frame) with the fct column set as key.
Next you can just subset with the vc vector with [J(vc)].

NOTE: when the key is a factor/character variable, you can also use setDT(dt, key = 'fct')[vc] but that won't work when vc is a numeric vector. When vc is a numeric vector and is not wrapped in J() or .(), vc will work as a rowindex.

A more detailed explanation of the concept of keys and subsetting can be found in the vignette Keys and fast binary search based subset.

An alternative as suggested by @Frank in the comments:

setDT(dt)[J(vc), on=.(fct)]

When vc contains values that are not present in dt, you'll need to add nomatch = 0:

setDT(dt, key = 'fct')[J(vc), nomatch = 0]

or:

setDT(dt)[J(vc), on=.(fct), nomatch = 0]

How do I make a newline after a twitter bootstrap element?

You're using span6 and span2. Both of these classes are "float:left" meaning, if possible they will always try to sit next to each other. Twitter bootstrap is based on a 12 grid system. So you should generally always get the span**#** to add up to 12.

E.g.: span4 + span4 + span4 OR span6 + span6 OR span4 + span3 + span5.

To force a span down though, without listening to the previous float you can use twitter bootstraps clearfix class. To do this, your code should look like this:

<ul class="nav nav-tabs span2">
  <li><a href="./index.html"><i class="icon-black icon-music"></i></a></li>
  <li><a href="./about.html"><i class="icon-black icon-eye-open"></i></a></li>
  <li><a href="./team.html"><i class="icon-black icon-user"></i></a></li>
  <li><a href="./contact.html"><i class="icon-black icon-envelope"></i></a></li>
</ul>
<!-- Notice this following line -->
<div class="clearfix"></div>
<div class="well span6">
  <h3>I wish this appeared on the next line without having to gratuitously use BR!</h3>
</div>

Twitter Bootstrap scrollable table rows and fixed header

<table class="table table-striped table-condensed table-hover rsk-tbl vScrollTHead">
            <thead>
            <tr>
                <th>Risk Element</th>
                <th>Description</th>
                <th>Risk Value</th>
                <th>&nbsp;</th>
            </tr>
            </thead>
        </table>
<div class="vScrollTable">
            <table class="table table-striped table-condensed table-hover rsk-tbl vScrollTBody">
                <tbody>
                <tr class="">
                    <td>JEWELLERY</td>
                    <td>Jewellery business</td>

                </tr><tr class="">
                    <td>NGO</td>
                    <td>none-governmental organizations</td>
                    </tr>
                </tbody>
            </table>
        </div>





.vScrollTBody{
  height:15px;
}

.vScrollTHead {
  height:15px;
}

.vScrollTable{
  height:100px;
  overflow-y:scroll;
}

having two tables for head and body worked for me

Loop through list with both content and index

Use enumerate():

>>> S = [1,30,20,30,2]
>>> for index, elem in enumerate(S):
        print(index, elem)

(0, 1)
(1, 30)
(2, 20)
(3, 30)
(4, 2)

What's the most elegant way to cap a number to a segment?

If you don’t want to define any function, writing it like Math.min(Math.max(x, a), b) isn’t that bad.

What is the cleanest way to disable CSS transition effects temporarily?

You can disable animation, transition, trasforms for all of element in page with this css code

var style = document.createElement('style');
style.type = 'text/css';
style.innerHTML = '* {' +
'/*CSS transitions*/' +
' -o-transition-property: none !important;' +
' -moz-transition-property: none !important;' +
' -ms-transition-property: none !important;' +
' -webkit-transition-property: none !important;' +
'  transition-property: none !important;' +
'/*CSS transforms*/' +
'  -o-transform: none !important;' +
' -moz-transform: none !important;' +
'   -ms-transform: none !important;' +
'  -webkit-transform: none !important;' +
'   transform: none !important;' +
'  /*CSS animations*/' +
'   -webkit-animation: none !important;' +
'   -moz-animation: none !important;' +
'   -o-animation: none !important;' +
'   -ms-animation: none !important;' +
'   animation: none !important;}';
   document.getElementsByTagName('head')[0].appendChild(style);

Check if list<t> contains any of another list

Here is a sample to find if there are match elements in another list

List<int> nums1 = new List<int> { 2, 4, 6, 8, 10 };
List<int> nums2 = new List<int> { 1, 3, 6, 9, 12};

if (nums1.Any(x => nums2.Any(y => y == x)))
{
    Console.WriteLine("There are equal elements");
}
else
{
    Console.WriteLine("No Match Found!");
}

From milliseconds to hour, minutes, seconds and milliseconds

Good question. Yes, one can do this more efficiently. Your CPU can extract both the quotient and the remainder of the ratio of two integers in a single operation. In <stdlib.h>, the function that exposes this CPU operation is called div(). In your psuedocode, you'd use it something like this:

function to_tuple(x):
    qr = div(x, 1000)
    ms = qr.rem
    qr = div(qr.quot, 60)
    s  = qr.rem
    qr = div(qr.quot, 60)
    m  = qr.rem
    h  = qr.quot

A less efficient answer would use the / and % operators separately. However, if you need both quotient and remainder, anyway, then you might as well call the more efficient div().

How do I convert a number to a letter in Java?

Personally, I prefer

return "ABCDEFGHIJKLMNOPQRSTUVWXYZ".substring(i, i+1);

which shares the backing char[]. Alternately, I think the next-most-readable approach is

return Character.toString((char) (i + 'A'));

which doesn't depend on remembering ASCII tables. It doesn't do validation, but if you want to, I'd prefer to write

char c = (char) (i + 'A');
return Character.isUpperCase(c) ? Character.toString(c) : null;

just to make it obvious that you're checking that it's an alphabetic character.

Drop default constraint on a column in TSQL

I would like to refer a previous question, Because I have faced same problem and solved by this solution. First of all a constraint is always built with a Hash value in it's name. So problem is this HASH is varies in different Machine or Database. For example DF__Companies__IsGlo__6AB17FE4 here 6AB17FE4 is the hash value(8 bit). So I am referring a single script which will be fruitful to all

DECLARE @Command NVARCHAR(MAX)
     declare @table_name nvarchar(256)
     declare @col_name nvarchar(256)
     set @table_name = N'ProcedureAlerts'
     set @col_name = N'EmailSent'

     select @Command ='Alter Table dbo.ProcedureAlerts Drop Constraint [' + ( select d.name
     from 
         sys.tables t
         join sys.default_constraints d on d.parent_object_id = t.object_id
         join sys.columns c on c.object_id = t.object_id
                               and c.column_id = d.parent_column_id
     where 
         t.name = @table_name
         and c.name = @col_name) + ']'

    --print @Command
    exec sp_executesql @Command

It will drop your default constraint. However if you want to create it again you can simply try this

ALTER TABLE [dbo].[ProcedureAlerts] ADD DEFAULT((0)) FOR [EmailSent]

Finally, just simply run a DROP command to drop the column.

Combining node.js and Python

This sounds like a scenario where zeroMQ would be a good fit. It's a messaging framework that's similar to using TCP or Unix sockets, but it's much more robust (http://zguide.zeromq.org/py:all)

There's a library that uses zeroMQ to provide a RPC framework that works pretty well. It's called zeroRPC (http://www.zerorpc.io/). Here's the hello world.

Python "Hello x" server:

import zerorpc

class HelloRPC(object):
    '''pass the method a name, it replies "Hello name!"'''
    def hello(self, name):
        return "Hello, {0}!".format(name)

def main():
    s = zerorpc.Server(HelloRPC())
    s.bind("tcp://*:4242")
    s.run()

if __name__ == "__main__" : main()

And the node.js client:

var zerorpc = require("zerorpc");

var client = new zerorpc.Client();
client.connect("tcp://127.0.0.1:4242");
//calls the method on the python object
client.invoke("hello", "World", function(error, reply, streaming) {
    if(error){
        console.log("ERROR: ", error);
    }
    console.log(reply);
});

Or vice-versa, node.js server:

var zerorpc = require("zerorpc");

var server = new zerorpc.Server({
    hello: function(name, reply) {
        reply(null, "Hello, " + name, false);
    }
});

server.bind("tcp://0.0.0.0:4242");

And the python client

import zerorpc, sys

c = zerorpc.Client()
c.connect("tcp://127.0.0.1:4242")
name = sys.argv[1] if len(sys.argv) > 1 else "dude"
print c.hello(name)

Converting char* to float or double

Code posted by you is correct and should have worked. But check exactly what you have in the char*. If the correct value is to big to be represented, functions will return a positive or negative HUGE_VAL. Check what you have in the char* against maximum values that float and double can represent on your computer.

Check this page for strtod reference and this page for atof reference.

I have tried the example you provided in both Windows and Linux and it worked fine.

When doing a MERGE in Oracle SQL, how can I update rows that aren't matched in the SOURCE?

MERGE INTO target
USING
(
    --Source data
    SELECT id, some_value, 0 deleteMe FROM source
    --And anything that has been deleted from the source
    UNION ALL
    SELECT id, null some_value, 1 deleteMe
    FROM
    (
        SELECT id FROM target
        MINUS
        SELECT id FROM source
    )
) source
   ON (target.ID = source.ID)
WHEN MATCHED THEN
    --Requires a lot of ugly CASE statements, to prevent updating deleted data
    UPDATE SET target.some_value =
        CASE WHEN deleteMe=1 THEN target.some_value ELSE source.some_value end
    ,isDeleted = deleteMe
WHEN NOT MATCHED THEN
    INSERT (id, some_value, isDeleted) VALUES (source.id, source.some_value, 0)

--Test data
create table target as
select 1 ID, 'old value 1' some_value, 0 isDeleted from dual union all
select 2 ID, 'old value 2' some_value, 0 isDeleted from dual;

create table source as
select 1 ID, 'new value 1' some_value, 0 isDeleted from dual union all
select 3 ID, 'new value 3' some_value, 0 isDeleted from dual;


--Results:
select * from target;

ID  SOME_VALUE   ISDELETED
1   new value 1  0
2   old value 2  1
3   new value 3  0

Find Item in ObservableCollection without using a loop

Consider creating an index. A dictionary can do the trick. If you need the list semantics, subclass and keep the index as a private member...

How to find first element of array matching a boolean condition in JavaScript?

Use findIndex as other previously written. Here's the full example:

function find(arr, predicate) {
    foundIndex = arr.findIndex(predicate);
    return foundIndex !== -1 ? arr[foundIndex] : null;
}

And usage is following (we want to find first element in array which has property id === 1).

var firstElement = find(arr, e => e.id === 1);

How do I convert a org.w3c.dom.Document object to a String?

A Scala version based on Zaz's answer.

  case class DocumentEx(document: Document) {
    def toXmlString(pretty: Boolean = false):Try[String] = {
      getStringFromDocument(document, pretty)
    }
  }

  implicit def documentToDocumentEx(document: Document):DocumentEx = {
    DocumentEx(document)
  }

  def getStringFromDocument(doc: Document, pretty:Boolean): Try[String] = {
    try
    {
      val domSource= new DOMSource(doc)
      val writer = new StringWriter()
      val result = new StreamResult(writer)
      val tf = TransformerFactory.newInstance()
      val transformer = tf.newTransformer()
      if (pretty)
        transformer.setOutputProperty(OutputKeys.INDENT, "yes")
      transformer.transform(domSource, result)
      Success(writer.toString);
    }
    catch {
      case ex: TransformerException =>
        Failure(ex)
    }
  }

With that, you can do either doc.toXmlString() or call the getStringFromDocument(doc) function.

Refreshing Web Page By WebDriver When Waiting For Specific Condition

You can also try

Driver.Instance.Navigate().Refresh();

Convert char array to a int number in C

I personally don't like atoi function. I would suggest sscanf:

char myarray[5] = {'-', '1', '2', '3', '\0'};
int i;
sscanf(myarray, "%d", &i);

It's very standard, it's in the stdio.h library :)

And in my opinion, it allows you much more freedom than atoi, arbitrary formatting of your number-string, and probably also allows for non-number characters at the end.

EDIT I just found this wonderful question here on the site that explains and compares 3 different ways to do it - atoi, sscanf and strtol. Also, there is a nice more-detailed insight into sscanf (actually, the whole family of *scanf functions).

EDIT2 Looks like it's not just me personally disliking the atoi function. Here's a link to an answer explaining that the atoi function is deprecated and should not be used in newer code.

Get loop counter/index using for…of syntax in JavaScript

Solution for small array collections:

for (var obj in arr) {
    var i = Object.keys(arr).indexOf(obj);
}

arr - ARRAY, obj - KEY of current element, i - COUNTER/INDEX

Notice: Method keys() is not available for IE version <9, you should use Polyfill code. https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/keys

Convert array of strings to List<string>

From .Net 3.5 you can use LINQ extension method that (sometimes) makes code flow a bit better.

Usage looks like this:

using System.Linq; 

// ...

public void My()
{
    var myArray = new[] { "abc", "123", "zyx" };
    List<string> myList = myArray.ToList();
}

PS. There's also ToArray() method that works in other way.

Pretty-print a Map in Java

Does not answer exactly the question, but it is worth mentioning Lombodok @ToString annotation. If you annotate with @ToString the key / value classes, then doing System.out.println(map) will return something meaningful.

It also works very well with maps-of-maps, for example: Map<MyKeyClass, Map<String, MyValueClass>> will be printed as

{MyKeyClass(properties...)={string1=MyValuesClass(properties...), string2=MyValuesCalss(properties...),..}, ... }

Looping through array and removing items, without breaking for loop

Here is another example for the proper use of splice. This example is about to remove 'attribute' from 'array'.

for (var i = array.length; i--;) {
    if (array[i] === 'attribute') {
        array.splice(i, 1);
    }
}

find first sequence item that matches a criterion

a=[100,200,300,400,500]
def search(b):
 try:
  k=a.index(b)
  return a[k] 
 except ValueError:
    return 'not found'
print(search(500))

it'll return the object if found else it'll return "not found"

how to convert a string to a bool

Here's my attempt at the most forgiving string to bool conversion that is still useful, basically keying off only the first character.

public static class StringHelpers
{
    /// <summary>
    /// Convert string to boolean, in a forgiving way.
    /// </summary>
    /// <param name="stringVal">String that should either be "True", "False", "Yes", "No", "T", "F", "Y", "N", "1", "0"</param>
    /// <returns>If the trimmed string is any of the legal values that can be construed as "true", it returns true; False otherwise;</returns>
    public static bool ToBoolFuzzy(this string stringVal)
    {
        string normalizedString = (stringVal?.Trim() ?? "false").ToLowerInvariant();
        bool result = (normalizedString.StartsWith("y") 
            || normalizedString.StartsWith("t")
            || normalizedString.StartsWith("1"));
        return result;
    }
}

Xcode stops working after set "xcode-select -switch"

You should be pointing it towards the Developer directory, not the Xcode application bundle. Run this:

sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer

With recent versions of Xcode, you can go to Xcode ? Preferences… ? Locations and pick one of the options for Command Line Tools to set the location.

How to check if the string is empty?

a = ''
b = '   '
a.isspace() -> False
b.isspace() -> True

Find the smallest amongst 3 numbers in C++

More elegant "ps aux | grep -v grep"

You could use preg_split instead of explode and split on [ ]+ (one or more spaces). But I think in this case you could go with preg_match_all and capturing:

preg_match_all('/[ ]php[ ]+\S+[ ]+(\S+)/', $input, $matches);
$result = $matches[1];

The pattern matches a space, php, more spaces, a string of non-spaces (the path), more spaces, and then captures the next string of non-spaces. The first space is mostly to ensure that you don't match php as part of a user name but really only as a command.

An alternative to capturing is the "keep" feature of PCRE. If you use \K in the pattern, everything before it is discarded in the match:

preg_match_all('/[ ]php[ ]+\S+[ ]+\K\S+/', $input, $matches);
$result = $matches[0];

I would use preg_match(). I do something similar for many of my system management scripts. Here is an example:

$test = "user     12052  0.2  0.1 137184 13056 ?        Ss   10:00   0:00 php /home/user/public_html/utilities/runProcFile.php cust1 cron
user     12054  0.2  0.1 137184 13064 ?        Ss   10:00   0:00 php /home/user/public_html/utilities/runProcFile.php cust3 cron
user     12055  0.6  0.1 137844 14220 ?        Ss   10:00   0:00 php /home/user/public_html/utilities/runProcFile.php cust4 cron
user     12057  0.2  0.1 137184 13052 ?        Ss   10:00   0:00 php /home/user/public_html/utilities/runProcFile.php cust89 cron
user     12058  0.2  0.1 137184 13052 ?        Ss   10:00   0:00 php /home/user/public_html/utilities/runProcFile.php cust435 cron
user     12059  0.3  0.1 135112 13000 ?        Ss   10:00   0:00 php /home/user/public_html/utilities/runProcFile.php cust16 cron
root     12068  0.0  0.0 106088  1164 pts/1    S+   10:00   0:00 sh -c ps aux | grep utilities > /home/user/public_html/logs/dashboard/currentlyPosting.txt
root     12070  0.0  0.0 103240   828 pts/1    R+   10:00   0:00 grep utilities";

$lines = explode("\n", $test);

foreach($lines as $line){
        if(preg_match("/.php[\s+](cust[\d]+)[\s+]cron/i", $line, $matches)){
                print_r($matches);
        }

}

The above prints:

Array
(
    [0] => .php cust1 cron
    [1] => cust1
)
Array
(
    [0] => .php cust3 cron
    [1] => cust3
)
Array
(
    [0] => .php cust4 cron
    [1] => cust4
)
Array
(
    [0] => .php cust89 cron
    [1] => cust89
)
Array
(
    [0] => .php cust435 cron
    [1] => cust435
)
Array
(
    [0] => .php cust16 cron
    [1] => cust16
)

You can set $test to equal the output from exec. the values you are looking for would be in the if statement under the foreach. $matches[1] will have the custx value.

Dictionaries and default values

How to check if a std::thread is still running?

This simple mechanism you can use for detecting finishing of a thread without blocking in join method.

std::thread thread([&thread]() {
    sleep(3);
    thread.detach();
});

while(thread.joinable())
    sleep(1);

How to find and return a duplicate value in array

find_all() returns an array containing all elements of enum for which block is not false.

To get duplicate elements

>> arr = ["A", "B", "C", "B", "A"]
>> arr.find_all { |x| arr.count(x) > 1 }

=> ["A", "B", "B", "A"]

Or duplicate uniq elements

>> arr.find_all { |x| arr.count(x) > 1 }.uniq
=> ["A", "B"]

iOS - UIImageView - how to handle UIImage image orientation

here is a workable sample cod, considering the image orientation:

#define rad(angle) ((angle) / 180.0 * M_PI)
- (CGAffineTransform)orientationTransformedRectOfImage:(UIImage *)img
{
    CGAffineTransform rectTransform;
    switch (img.imageOrientation)
    {
        case UIImageOrientationLeft:
            rectTransform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(rad(90)), 0, -img.size.height);
            break;
        case UIImageOrientationRight:
            rectTransform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(rad(-90)), -img.size.width, 0);
            break;
        case UIImageOrientationDown:
            rectTransform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(rad(-180)), -img.size.width, -img.size.height);
            break;
        default:
            rectTransform = CGAffineTransformIdentity;
    };

    return CGAffineTransformScale(rectTransform, img.scale, img.scale);
}


- (UIImage *)croppedImage:(UIImage*)orignialImage InRect:(CGRect)visibleRect{
    //transform visible rect to image orientation
    CGAffineTransform rectTransform = [self orientationTransformedRectOfImage:orignialImage];
    visibleRect = CGRectApplyAffineTransform(visibleRect, rectTransform);

    //crop image
    CGImageRef imageRef = CGImageCreateWithImageInRect([orignialImage CGImage], visibleRect);
    UIImage *result = [UIImage imageWithCGImage:imageRef scale:orignialImage.scale orientation:orignialImage.imageOrientation];
    CGImageRelease(imageRef);
    return result;
}

Secure random token in Node.js

Simple function that gets you a token that is URL safe and has base64 encoding! It's a combination of 2 answers from above.

const randomToken = () => {
    crypto.randomBytes(64).toString('base64').replace(/\//g,'_').replace(/\+/g,'-');
}

Check if table exists without using "select from"

There are several issues to note with the answers here:

1) INFORMATION_SCHEMA.TABLES does not include TEMPORARY tables.

2) Using any type of SHOW query, i.e. SHOW TABLES LIKE 'test_table', will force the return of a resultset to the client, which is undesired behavior for checking if a table exists server-side, from within a stored procedure that also returns a resultset.

3) As some users mentioned, you have to be careful with how you use SELECT 1 FROM test_table LIMIT 1.

If you do something like:

SET @table_exists = 0;
SET @table_exists = (SELECT 1 FROM test_table LIMIT 1);

You will not get the expected result if the table has zero rows.

Below is a stored procedure that will work for all tables (even TEMPORARY).

It can be used like:

SET @test_table = 'test_table';
SET @test_db = NULL;
SET @does_table_exist = NULL;

CALL DoesTableExist(@test_table, @test_db, @does_table_exist);

SELECT @does_table_exist;

The code:

/*
    p_table_name is required
    p_database_name is optional
        if NULL is given for p_database_name, then it defaults to the currently selected database
    p_does_table_exist
        The @variable to save the result to

    This procedure attempts to
        SELECT NULL FROM `p_database_name`.`p_table_name` LIMIT 0;

    If [SQLSTATE '42S02'] is raised, then
        SET p_does_table_exist = 0
    Else
        SET p_does_table_exist = 1

    Info on SQLSTATE '42S02' at:
        https://dev.mysql.com/doc/refman/5.7/en/server-error-reference.html#error_er_no_such_table
*/

DELIMITER $$

DROP PROCEDURE IF EXISTS DoesTableExist
$$

CREATE PROCEDURE         DoesTableExist (
    IN p_table_name VARCHAR(64),
    IN p_database_name VARCHAR(64),
    OUT p_does_table_exist TINYINT(1) UNSIGNED
)
BEGIN
    /* 793441 is used in this procedure for ensuring that user variables have unique names */

    DECLARE EXIT HANDLER FOR SQLSTATE '42S02'
    BEGIN
        SET p_does_table_exist = 0
        ;
    END
    ;


    IF p_table_name IS NULL THEN
        SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'DoesTableExist received NULL for p_table_name.';
    END IF;


    /* redirect resultset to a dummy variable */

    SET @test_select_sql_793441 = CONCAT(
        "SET @dummy_var_793441 = ("
            " SELECT"
                " NULL"
            " FROM ",
                IF(
                    p_database_name IS NULL,
                    "",
                    CONCAT(
                        "`",
                        REPLACE(p_database_name, "`", "``"),
                        "`."
                    )
                ),
                "`",
                REPLACE(p_table_name, "`", "``"),
                "`"
            " LIMIT 0"
        ")"
    )
    ;

    PREPARE _sql_statement FROM @test_select_sql_793441
    ;
    SET @test_select_sql_793441 = NULL
    ;
    EXECUTE _sql_statement
    ;
    DEALLOCATE PREPARE _sql_statement
    ;

    SET p_does_table_exist = 1
    ;
END
$$

DELIMITER ;

How do you align left / right a div without using float?

It is dirty better use the overflow: hidden; hack:

<div class="container">
  <div style="float: left;">Left Div</div>
  <div style="float: right;">Right Div</div>
</div>

.container { overflow: hidden; }

Or if you are going to do some fancy CSS3 drop-shadow stuff and you get in trouble with the above solution:

http://web.archive.org/web/20120414135722/http://fordinteractive.com/2009/12/goodbye-overflow-clearing-hack

If you want to go for clean I would rather worry about that inline javascript rather than the overflow: hidden; hack :)

How to get active user's UserDetails

You can try this: By Using Authentication Object from Spring we can get User details from it in the controller method . Below is the example , by passing Authentication object in the controller method along with argument.Once user is authenticated the details are populated in the Authentication Object.

@GetMapping(value = "/mappingEndPoint") <ReturnType> methodName(Authentication auth) {
   String userName = auth.getName(); 
   return <ReturnType>;
}

How to check if a line has one of the strings in a list?

This still loops through the cartesian product of the two lists, but it does it one line:

>>> lines1 = ['soup', 'butter', 'venison']
>>> lines2 = ['prune', 'rye', 'turkey']
>>> search_strings = ['a', 'b', 'c']
>>> any(s in l for l in lines1 for s in search_strings)
True
>>> any(s in l for l in lines2 for s in search_strings)
False

This also have the advantage that any short-circuits, and so the looping stops as soon as a match is found. Also, this only finds the first occurrence of a string from search_strings in linesX. If you want to find multiple occurrences you could do something like this:

>>> lines3 = ['corn', 'butter', 'apples']
>>> [(s, l) for l in lines3 for s in search_strings if s in l]
[('c', 'corn'), ('b', 'butter'), ('a', 'apples')]

If you feel like coding something more complex, it seems the Aho-Corasick algorithm can test for the presence of multiple substrings in a given input string. (Thanks to Niklas B. for pointing that out.) I still think it would result in quadratic performance for your use-case since you'll still have to call it multiple times to search multiple lines. However, it would beat the above (cubic, on average) algorithm.

Find first element in a sequence that matches a predicate

You could use a generator expression with a default value and then next it:

next((x for x in seq if predicate(x)), None)

Although for this one-liner you need to be using Python >= 2.6.

This rather popular article further discusses this issue: Cleanest Python find-in-list function?.

MySQL - select data from database between two dates

Your problem is that the short version of dates uses midnight as the default. So your query is actually:

SELECT users.* FROM users 
WHERE created_at >= '2011-12-01 00:00:00' 
AND created_at <= '2011-12-06 00:00:00'

This is why you aren't seeing the record for 10:45.

Change it to:

SELECT users.* FROM users 
WHERE created_at >= '2011-12-01' 
AND created_at <= '2011-12-07'

You can also use:

SELECT users.* from users 
WHERE created_at >= '2011-12-01' 
AND created_at <= date_add('2011-12-01', INTERVAL 7 DAY)

Which will select all users in the same interval you are looking for.

You might also find the BETWEEN operator more readable:

SELECT users.* from users 
WHERE created_at BETWEEN('2011-12-01', date_add('2011-12-01', INTERVAL 7 DAY));

Elegant way to report missing values in a data.frame

My new favourite for (not too wide) data are methods from excellent naniar package. Not only you get frequencies but also patterns of missingness:

library(naniar)
library(UpSetR)

riskfactors %>%
  as_shadow_upset() %>%
  upset()

It's often useful to see where the missings are in relation to non missing which can be achieved by plotting scatter plot with missings:

ggplot(airquality,
       aes(x = Ozone,
           y = Solar.R)) +
 geom_miss_point()

Or for categorical variables:

gg_miss_fct(x = riskfactors, fct = marital)

These examples are from package vignette that lists other interesting visualizations.

What is the most elegant way to check if all values in a boolean array are true?

You can check all value items are true or false by compare your array with the other boolean array via Arrays.equal method like below example :

private boolean isCheckedAnswer(List<Answer> array) {
    boolean[] isSelectedChecks = new boolean[array.size()];
    for (int i = 0; i < array.size(); i++) {
        isSelectedChecks[i] = array.get(i).isChecked();
    }

    boolean[] isAllFalse = new boolean[array.size()];
    for (int i = 0; i < array.size(); i++) {
        isAllFalse[i] = false;
    }

    return !Arrays.equals(isSelectedChecks, isAllFalse);
}

How to convert currentTimeMillis to a date in Java?

My Solution

public class CalendarUtils {

    public static String dateFormat = "dd-MM-yyyy hh:mm";
    private static SimpleDateFormat simpleDateFormat = new SimpleDateFormat(dateFormat);

    public static String ConvertMilliSecondsToFormattedDate(String milliSeconds){
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(Long.parseLong(milliSeconds));
        return simpleDateFormat.format(calendar.getTime());
    }
}

Remove last characters from a string in C#. An elegant way?

String.Format("{0:0}", 123.4567);      // "123"

If your initial value is a decimal into a string, you will need to convert

String.Format("{0:0}", double.Parse("3.5", CultureInfo.InvariantCulture))  //3.5

In this example, I choose Invariant culture but you could use the one you want.

I prefer using the Formatting function because you never know if the decimal may contain 2 or 3 leading number in the future.

Edit: You can also use Truncate to remove all after the , or .

Console.WriteLine(Decimal.Truncate(Convert.ToDecimal("3,5")));

Uninstall all installed gems, in OSX?

gem list --no-version | grep -v -e 'psych' -e 'rdoc' -e 'openssl' -e 'json' -e 'io-console' -e 'bigdecimal' | xargs sudo gem uninstall -ax

grep here is excluding default gems. All other gems will be uninstalled. You can also precede it with sudo in case you get permission issues.

Conditional HTML Attributes using Razor MVC3

I guess a little more convenient and structured way is to use Html helper. In your view it can be look like:

@{
 var htmlAttr = new Dictionary<string, object>();
 htmlAttr.Add("id", strElementId);
 if (!CSSClass.IsEmpty())
 {
   htmlAttr.Add("class", strCSSClass);
 }
}

@* ... *@

@Html.TextBox("somename", "", htmlAttr)

If this way will be useful for you i recommend to define dictionary htmlAttr in your model so your view doesn't need any @{ } logic blocks (be more clear).

Python datetime to string without microsecond component

This is the way I do it. ISO format:

import datetime
datetime.datetime.now().replace(microsecond=0).isoformat()
# Returns: '2017-01-23T14:58:07'

You can replace the 'T' if you don't want ISO format:

datetime.datetime.now().replace(microsecond=0).isoformat(' ')
# Returns: '2017-01-23 15:05:27'

Jquery, checking if a value exists in array or not

    if ($.inArray('yourElement', yourArray) > -1)
    {
        //yourElement in yourArray
        //code here

    }

Reference: Jquery Array

The $.inArray() method is similar to JavaScript's native .indexOf() method in that it returns -1 when it doesn't find a match. If the first element within the array matches value, $.inArray() returns 0.

How to pass prepareForSegue: an object

In Swift 4.2 I would do something like that:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let yourVC = segue.destination as? YourViewController {
        yourVC.yourData = self.someData
    }
}

Unpacking a list / tuple of pairs into two lists / tuples

list1 = (x[0] for x in source_list)
list2 = (x[1] for x in source_list)

Switch between two frames in tkinter

Here is another simple answer, but without using classes.

from tkinter import *


def raise_frame(frame):
    frame.tkraise()

root = Tk()

f1 = Frame(root)
f2 = Frame(root)
f3 = Frame(root)
f4 = Frame(root)

for frame in (f1, f2, f3, f4):
    frame.grid(row=0, column=0, sticky='news')

Button(f1, text='Go to frame 2', command=lambda:raise_frame(f2)).pack()
Label(f1, text='FRAME 1').pack()

Label(f2, text='FRAME 2').pack()
Button(f2, text='Go to frame 3', command=lambda:raise_frame(f3)).pack()

Label(f3, text='FRAME 3').pack(side='left')
Button(f3, text='Go to frame 4', command=lambda:raise_frame(f4)).pack(side='left')

Label(f4, text='FRAME 4').pack()
Button(f4, text='Goto to frame 1', command=lambda:raise_frame(f1)).pack()

raise_frame(f1)
root.mainloop()

How to round up integer division and have int result in Java?

this might be helpfull,, Subtract the remainder to the legnth and make it a divisible number and then divide it with 153

int r=message.length()%153;       //Calculate the remainder by %153
return (message.length()-r)/153;  // find the pages by adding the remainder and 
                                  //then divide by 153

How do I deal with "signed/unsigned mismatch" warnings (C4018)?

If you can't/won't use iterators and if you can't/won't use std::size_t for the loop index, make a .size() to int conversion function that documents the assumption and does the conversion explicitly to silence the compiler warning.

#include <cassert>
#include <cstddef>
#include <limits>

// When using int loop indexes, use size_as_int(container) instead of
// container.size() in order to document the inherent assumption that the size
// of the container can be represented by an int.
template <typename ContainerType>
/* constexpr */ int size_as_int(const ContainerType &c) {
    const auto size = c.size();  // if no auto, use `typename ContainerType::size_type`
    assert(size <= static_cast<std::size_t>(std::numeric_limits<int>::max()));
    return static_cast<int>(size);
}

Then you write your loops like this:

for (int i = 0; i < size_as_int(things); ++i) { ... }

The instantiation of this function template will almost certainly be inlined. In debug builds, the assumption will be checked. In release builds, it won't be and the code will be as fast as if you called size() directly. Neither version will produce a compiler warning, and it's only a slight modification to the idiomatic loop.

If you want to catch assumption failures in the release version as well, you can replace the assertion with an if statement that throws something like std::out_of_range("container size exceeds range of int").

Note that this solves both the signed/unsigned comparison as well as the potential sizeof(int) != sizeof(Container::size_type) problem. You can leave all your warnings enabled and use them to catch real bugs in other parts of your code.

geom_smooth() what are the methods available?

The method argument specifies the parameter of the smooth statistic. You can see stat_smooth for the list of all possible arguments to the method argument.

How get the base URL via context path in JSF?

JSTL 1.2 variation leveraged from BalusC answer

<c:set var="baseURL" value="${pageContext.request.requestURL.substring(0, pageContext.request.requestURL.length() - pageContext.request.requestURI.length())}${pageContext.request.contextPath}/" />

<head>
  <base href="${baseURL}" />

Get the device width in javascript

I just had this idea, so maybe it's shortsighted, but it seems to work well and might be the most consistent between your CSS and JS.

In your CSS you set the max-width value for html based on the @media screen value:

@media screen and (max-width: 480px) and (orientation: portrait){

    html { 
        max-width: 480px;
    }

    ... more styles for max-width 480px screens go here

}

Then, using JS (probably via a framework like JQuery), you would just check the max-width value of the html tag:

maxwidth = $('html').css('max-width');

Now you can use this value to make conditional changes:

If (maxwidth == '480px') { do something }

If putting the max-width value on the html tag seems scary, then maybe you can put on a different tag, one that is only used for this purpose. For my purpose the html tag works fine and doesn't affect my markup.

Useful if you are using Sass, etc: To return a more abstract value, such as breakpoint name, instead of px value you can do something like:

Create an element that will store the breakpoint name, e.g. <div id="breakpoint-indicator" />
Using css media queries change the content property for this element, e. g. "large" or "mobile", etc (same basic media query approach as above, but setting css 'content' property instead of 'max-width').
Get the css content property value using js or jquery (jquery e.g. $('#breakpoint-indicator').css('content');), which returns "large", or "mobile", etc depending on what the content property is set to by the media query.
Act on the current value.

Now you can act on same breakpoint names as you do in sass, e.g. sass: @include respond-to(xs), and js if ($breakpoint = "xs) {}.

What I especially like about this is that I can define my breakpoint names all in css and in one place (likely a variables scss document) and my js can act on them independently.

Get a random boolean in python?

random.choice([True, False])

would also work.

Fast check for NaN in NumPy

Related to this is the question of how to find the first occurrence of NaN. This is the fastest way to handle that that I know of:

index = next((i for (i,n) in enumerate(iterable) if n!=n), None)

Is it possible to make an HTML anchor tag not clickable/linkable using CSS?

A more un-obtrusive way (assuming you use jQuery):

HTML:

<a id="my-link" href="page.html">page link</a>

Javascript:

$('#my-link').click(function(e)
{
    e.preventDefault();
});

The advantage of this is the clean separation between logic and presentation. If one day you decide that this link would do something else, you don't have to mess with the markup, just the JS.

calling java methods in javascript code

Java is a server side language, whereas javascript is a client side language. Both cannot communicate. If you have setup some server side script using Java you could use AJAX on the client in order to send an asynchronous request to it and thus invoke any possible Java functions. For example if you use jQuery as js framework you may take a look at the $.ajax() method. Or if you wanted to do it using plain javascript, here's a tutorial.

How to call an async method from a getter or setter?

I think that we can await for the value just returning first null and then get the real value, so in the case of Pure MVVM (PCL project for instance) I think the following is the most elegant solution:

private IEnumerable myList;
public IEnumerable MyList
{
  get
    { 
      if(myList == null)
         InitializeMyList();
      return myList;
     }
  set
     {
        myList = value;
        NotifyPropertyChanged();
     }
}

private async void InitializeMyList()
{
   MyList = await AzureService.GetMyList();
}

How to check if a string contains an element from a list in Python

Use a generator together with any, which short-circuits on the first True:

if any(ext in url_string for ext in extensionsToCheck):
    print(url_string)

EDIT: I see this answer has been accepted by OP. Though my solution may be "good enough" solution to his particular problem, and is a good general way to check if any strings in a list are found in another string, keep in mind that this is all that this solution does. It does not care WHERE the string is found e.g. in the ending of the string. If this is important, as is often the case with urls, you should look to the answer of @Wladimir Palant, or you risk getting false positives.

sql searching multiple words in a string

Oracle SQL:

There is the "IN" Operator in Oracle SQL which can be used for that:

select 
    namet.customerfirstname, addrt.city, addrt.postalcode
from schemax.nametable namet
join schemax.addresstable addrt on addrt.adtid = namet.natadtid
where namet.customerfirstname in ('David', 'Moses', 'Robi');

Using a SELECT statement within a WHERE clause

It's not bad practice at all. They are usually referred as SUBQUERY, SUBSELECT or NESTED QUERY.

It's a relatively expensive operation, but it's quite common to encounter a lot of subqueries when dealing with databases since it's the only way to perform certain kind of operations on data.

How to count certain elements in array?

Very simple:

var count = 0;
for(var i = 0; i < array.length; ++i){
    if(array[i] == 2)
        count++;
}

Excel VBA function to print an array to the workbook

You can define a Range, the size of your array and use it's value property:

Sub PrintArray(Data, SheetName As String, intStartRow As Integer, intStartCol As Integer)

    Dim oWorksheet As Worksheet
    Dim rngCopyTo As Range
    Set oWorksheet = ActiveWorkbook.Worksheets(SheetName)

    ' size of array
    Dim intEndRow As Integer
    Dim intEndCol As Integer
    intEndRow = UBound(Data, 1)
    intEndCol = UBound(Data, 2)

    Set rngCopyTo = oWorksheet.Range(oWorksheet.Cells(intStartRow, intStartCol), oWorksheet.Cells(intEndRow, intEndCol))
    rngCopyTo.Value = Data

End Sub

Elegant way to read file into byte[] array in Java

This will also work:

import java.io.*;

public class IOUtil {

    public static byte[] readFile(String file) throws IOException {
        return readFile(new File(file));
    }

    public static byte[] readFile(File file) throws IOException {
        // Open file
        RandomAccessFile f = new RandomAccessFile(file, "r");
        try {
            // Get and check length
            long longlength = f.length();
            int length = (int) longlength;
            if (length != longlength)
                throw new IOException("File size >= 2 GB");
            // Read file and return data
            byte[] data = new byte[length];
            f.readFully(data);
            return data;
        } finally {
            f.close();
        }
    }
}

Easy way to print Perl array? (with a little formatting)

You can use Data::Dump:

use Data::Dump qw(dump);
my @a = (1, [2, 3], {4 => 5});
dump(@a);

Produces:

"(1, [2, 3], { 4 => 5 })"

Execute bash script from URL

The best way to do it is

curl http://domain/path/to/script.sh | bash -s arg1 arg2

which is a slight change of answer by @user77115

Group list by values

>>> xs = [["A",0], ["B",1], ["C",0], ["D",2], ["E",2]]
>>> xs.sort(key=lambda x: x[1])
>>> reduce(lambda l, x: (l.append([x]) if l[-1][0][1] != x[1] else l[-1].append(x)) or l, xs[1:], [[xs[0]]]) if xs else []
[[['A', 0], ['C', 0]], [['B', 1]], [['D', 2], ['E', 2]]]

Basically, if the list is sorted, it is possible to reduce by looking at the last group constructed by the previous steps - you can tell if you need to start a new group, or modify an existing group. The ... or l bit is a trick that enables us to use lambda in Python. (append returns None. It is always better to return something more useful than None, but, alas, such is Python.)

How to check if an integer is in a given range?

For those using commons lang an option is to use Range:

Range<Integer> myRange = Range.between(100, 500);
if (myRange.contains(200)){
    // do something
}

Also see: how to construct a apache commons 3.1 Range<Integer> object

More elegant way of declaring multiple variables at the same time

Use a list/dictionary or define your own class to encapsulate the stuff you're defining, but if you need all those variables you can do:

a = b = c = d = e = g = h = i = j = True
f = False

How to get previous month and year relative to today, using strtotime and date?

If you want the previous year and month relative to a specific date and have DateTime available then you can do this:

$d = new DateTime('2013-01-01', new DateTimeZone('UTC')); 
$d->modify('first day of previous month');
$year = $d->format('Y'); //2012
$month = $d->format('m'); //12

What are the most-used vim commands/keypresses?

Have you run through Vim's built-in tutorial? If not, drop to the command-line and type vimtutor. It's a great way to learn the initial commands.

Vim has an incredible amount of flexibility and power and, if you're like most vim users, you'll learn a lot of new commands and forget old ones, then relearn them. The built-in help is good and worthy of periodic browsing to learn new stuff.

There are several good FAQs and cheatsheets for vim on the internet. I'd recommend searching for vim + faq and vim + cheatsheet. Cheat-Sheets.org#vim is a good source, as is Vim Tips wiki.

How to delete items from a dictionary while iterating over it?

You could also do it in two steps:

remove = [k for k in mydict if k == val]
for k in remove: del mydict[k]

My favorite approach is usually to just make a new dict:

# Python 2.7 and 3.x
mydict = { k:v for k,v in mydict.items() if k!=val }
# before Python 2.7
mydict = dict((k,v) for k,v in mydict.iteritems() if k!=val)

What is a elegant way in Ruby to tell if a variable is a Hash or an Array?

First of all, the best answer for the literal question is

Hash === @some_var

But the question really should have been answered by showing how to do duck-typing here. That depends a bit on what kind of duck you need.

@some_var.respond_to?(:each_pair)

@some_var.respond_to?(:has_key?)

or even

@some_var.respond_to?(:to_hash)

may be right depending on the application.

Extract subset of key-value pairs from Python dictionary object?

A bit shorter, at least:

wanted_keys = ['l', 'm', 'n'] # The keys you want
dict((k, bigdict[k]) for k in wanted_keys if k in bigdict)

How to set Bullet colors in UL/LI html lists via CSS without using any images or span tags

I tried this and things got weird for me. (css stopped working after the :after {content: "";} part of this tutorial. I found you can color the bullets by just using color:#ddd; on the li item itself.

Here's an example.

li{
    color:#ff0000;    
    list-style:square;                
}
a {
    text-decoration: none;
    color:#00ff00;
}

a:hover {
    background-color: #ddd;
}

How to sort an associative array by its values in Javascript?

No unnecessary complication required...

function sortMapByValue(map)
{
    var tupleArray = [];
    for (var key in map) tupleArray.push([key, map[key]]);
    tupleArray.sort(function (a, b) { return a[1] - b[1] });
    return tupleArray;
}

Mapping many-to-many association table with extra column(s)

As said before, with JPA, in order to have the chance to have extra columns, you need to use two OneToMany associations, instead of a single ManyToMany relationship. You can also add a column with autogenerated values; this way, it can work as the primary key of the table, if useful.

For instance, the implementation code of the extra class should look like that:

@Entity
@Table(name = "USER_SERVICES")
public class UserService{

    // example of auto-generated ID
    @Id
    @Column(name = "USER_SERVICES_ID", nullable = false)
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long userServiceID;



    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "USER_ID")
    private User user;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "SERVICE_ID")
    private Service service;



    // example of extra column
    @Column(name="VISIBILITY")    
    private boolean visibility;



    public long getUserServiceID() {
        return userServiceID;
    }


    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public Service getService() {
        return service;
    }

    public void setService(Service service) {
        this.service = service;
    }

    public boolean getVisibility() {
        return visibility;
    }

    public void setVisibility(boolean visibility) {
        this.visibility = visibility;
    }

}

git pull while not in a git directory

As some of my servers are on an old Ubuntu LTS versions, I can't easily upgrade git to the latest version (which supports the -C option as described in some answers).

This trick works well for me, especially because it does not have the side effect of some other answers that leave you in a different directory from where you started.

pushd /X/Y
git pull
popd

Or, doing it as a one-liner:

pushd /X/Y; git pull; popd

Both Linux and Windows have pushd and popd commands.

How to change the decimal separator of DecimalFormat from comma to dot/point?

String money = output.replace(',', '.');

C# - Insert a variable number of spaces into a string? (Formatting an output file)

I agree with Justin, and the WhiteSpace CHAR can be referenced using ASCII codes here Character number 32 represents a white space, Therefore:

string.Empty.PadRight(totalLength, (char)32);

An alternative approach: Create all spaces manually within a custom method and call it:

private static string GetSpaces(int totalLength)
    {
        string result = string.Empty;
        for (int i = 0; i < totalLength; i++)
        {
            result += " ";
        }
        return result;
    }

And call it in your code to create white spaces: GetSpaces(14);

Mapping object to dictionary and vice versa

I think you should use reflection. Something like this:

private T ConvertDictionaryTo<T>(IDictionary<string, object> dictionary) where T : new()
{
    Type type = typeof (T);
    T ret = new T();

    foreach (var keyValue in dictionary)
    {
        type.GetProperty(keyValue.Key).SetValue(ret, keyValue.Value, null);
    }

    return ret;
}

It takes your dictionary and loops through it and sets the values. You should make it better but it's a start. You should call it like this:

SomeClass someClass = ConvertDictionaryTo<SomeClass>(a);

PostgreSQL wildcard LIKE for any of a list of words

You can use Postgres' SIMILAR TO operator which supports alternations, i.e.

select * from table where lower(value) similar to '%(foo|bar|baz)%';

jQuery click / toggle between two functions

Micro jQuery Plugin

If you want your own chainable clickToggle jQuery Method you can do it like:

_x000D_

jQuery.fn.clickToggle = function(a, b) {_x000D_
  return this.on("click", function(ev) { [b, a][this.$_io ^= 1].call(this, ev) })_x000D_
};_x000D_
_x000D_
// TEST:_x000D_
$('button').clickToggle(function(ev) {_x000D_
  $(this).text("B"); _x000D_
}, function(ev) {_x000D_
  $(this).text("A");_x000D_
});

_x000D_

<button>A</button>_x000D_
<button>A</button>_x000D_
<button>A</button>_x000D_
_x000D_
<script src="//code.jquery.com/jquery-3.3.1.min.js"></script>

_x000D_

Simple Functions Toggler

LIVE DEMO

function a(){ console.log('a'); }
function b(){ console.log('b'); }

$("selector").click(function() { 
  return (this.tog = !this.tog) ? a() : b();
});

If you want it even shorter (why would one, right?!) you can use the Bitwise XOR ^*Docs operator like:
DEMO

  return (this.tog^=1) ? a() : b();

That's all.
_{The trick is to set to the this Object a boolean property tog, and toggle it using negation (tog = !tog)

and put the needed function calls
in a Conditional Operator ?:}

In OP's example (even with multiple elements) could look like:

function a(el){ $(el).animate({width: 260}, 1500); }
function b(el){ $(el).animate({width: 30}, 1500);  }

$("selector").click(function() {
  var el = this;
  return (el.t = !el.t) ? a(el) : b(el);
});

ALSO: You can also store-toggle like:
DEMO:

$("selector").click(function() {
  $(this).animate({width: (this.tog ^= 1) ? 260 : 30 });
});

_{but it was not the OP's exact request for he's looking for a way to have two separate operations / functions}

Using Array.prototype.reverse:

_{Note: this will not store the current Toggle state but just inverse our functions positions in Array (It has it's uses...)}

You simply store your a,b functions inside an array, onclick you simply reverse the array order and execute the array[1] function:

LIVE DEMO

function a(){ console.log("a"); }
function b(){ console.log("b"); }
var ab = [a,b];

$("selector").click(function(){
  ab.reverse()[1](); // Reverse and Execute! // >> "a","b","a","b"...
});

SOME MASHUP!

jQuery DEMO
JavaScript DEMO

Create a nice function toggleAB() that will contain your two functions, put them in Array, and at the end of the array you simply execute the function [0 // 1] respectively depending on the tog property that's passed to the function from the this reference:

function toggleAB(){
  var el = this; // `this` is the "button" Element Obj reference`
  return [
    function() { console.log("b"); },
    function() { console.log("a"); }
  ][el.tog^=1]();
}

$("selector").click( toggleAB );

Get the last element of a std::string

*(myString.end() - 1) maybe? That's not exactly elegant either.

A python-esque myString.at(-1) would be asking too much of an already-bloated class.

Create comma separated strings C#?

You can use the string.Join method to do something like string.Join(",", o.Number, o.Id, o.whatever, ...).

edit: As digEmAll said, string.Join is faster than StringBuilder. They use an external implementation for the string.Join.

Profiling code (of course run in release without debug symbols):

class Program
{
    static void Main(string[] args)
    {
        Stopwatch sw = new Stopwatch();
        string r;
        int iter = 10000;

        string[] values = { "a", "b", "c", "d", "a little bit longer please", "one more time" };

        sw.Restart();
        for (int i = 0; i < iter; i++)
            r = Program.StringJoin(",", values);
        sw.Stop();
        Console.WriteLine("string.Join ({0} times): {1}ms", iter, sw.ElapsedMilliseconds);

        sw.Restart();
        for (int i = 0; i < iter; i++)
            r = Program.StringBuilderAppend(",", values);
        sw.Stop();
        Console.WriteLine("StringBuilder.Append ({0} times): {1}ms", iter, sw.ElapsedMilliseconds);
        Console.ReadLine();
    }

    static string StringJoin(string seperator, params string[] values)
    {
        return string.Join(seperator, values);
    }

    static string StringBuilderAppend(string seperator, params string[] values)
    {
        StringBuilder builder = new StringBuilder();
        builder.Append(values[0]);
        for (int i = 1; i < values.Length; i++)
        {
            builder.Append(seperator);
            builder.Append(values[i]);
        }
        return builder.ToString();
    }
}

string.Join took 2ms on my machine and StringBuilder.Append 5ms. So there is noteworthy difference. Thanks to digAmAll for the hint.

Get a specific bit from byte

The method is to use another byte along with a bitwise AND to mask out the target bit.

I used convention from my classes here where "0" is the most significant bit and "7" is the least.

public static class ByteExtensions
{
    // Assume 0 is the MSB andd 7 is the LSB.
    public static bool GetBit(this byte byt, int index)
    {
        if (index < 0 || index > 7)
            throw new ArgumentOutOfRangeException();

        int shift = 7 - index;

        // Get a single bit in the proper position.
        byte bitMask = (byte)(1 << shift);

        // Mask out the appropriate bit.
        byte masked = (byte)(byt & bitMask);

        // If masked != 0, then the masked out bit is 1.
        // Otherwise, masked will be 0.
        return masked != 0;
    }
}

How can I open multiple files using "with open" in Python?

As of Python 2.7 (or 3.1 respectively) you can write

with open('a', 'w') as a, open('b', 'w') as b:
    do_something()

In earlier versions of Python, you can sometimes use contextlib.nested() to nest context managers. This won't work as expected for opening multiples files, though -- see the linked documentation for details.

In the rare case that you want to open a variable number of files all at the same time, you can use contextlib.ExitStack, starting from Python version 3.3:

with ExitStack() as stack:
    files = [stack.enter_context(open(fname)) for fname in filenames]
    # Do something with "files"

Most of the time you have a variable set of files, you likely want to open them one after the other, though.

Better way to shuffle two numpy arrays in unison

There is a well-known function that can handle this:

from sklearn.model_selection import train_test_split
X, _, Y, _ = train_test_split(X,Y, test_size=0.0)

Just setting test_size to 0 will avoid splitting and give you shuffled data. Though it is usually used to split train and test data, it does shuffle them too.
From documentation

Split arrays or matrices into random train and test subsets

Quick utility that wraps input validation and next(ShuffleSplit().split(X, y)) and application to input data into a single call for splitting (and optionally subsampling) data in a oneliner.

Split string in C every white space

For the fun of it here's an implementation based on the callback approach:

const char* find(const char* s,
                 const char* e,
                 int (*pred)(char))
{
    while( s != e && !pred(*s) ) ++s;
    return s;
}

void split_on_ws(const char* s,
                 const char* e,
                 void (*callback)(const char*, const char*))
{
    const char* p = s;
    while( s != e ) {
        s = find(s, e, isspace);
        callback(p, s);
        p = s = find(s, e, isnotspace);
    }
}

void handle_word(const char* s, const char* e)
{
    // handle the word that starts at s and ends at e
}

int main()
{
    split_on_ws(some_str, some_str + strlen(some_str), handle_word);
}

How to parse JSON to receive a Date object in JavaScript?

AngularJS couldn't parse .NET JSON date /Date(xxxxxxxxxxxxx)/ string either..

I side stepped this issue by formatting the date to its ISO 8601 string representation instead of dumping the Date object directly...

Here is a sample of ASP.NET MVC code..

return Json(new { 
  date : DateTime.Now.ToString("O") //ISO 8601 Angular understands this format
});

I tried RFC 1123 but it doesn't work.. Angular treats this as string instead of Date.

return Json(new { 
  date : DateTime.Now.ToString("R") //RFC 1123 Angular won't parse this
});

How to Deep clone in javascript

var newDate = new Date(this.oldDate); I was passing oldDate to function and generating newDate from this.oldDate, but it was changing this.oldDate also.So i used that solution and it worked.

In Python, is there an elegant way to print a list in a custom format without explicit looping?

from time import clock
from random import sample

n = 500
myList = sample(xrange(10000),n)
#print myList

A,B,C,D = [],[],[],[]

for i in xrange(100):
    t0 = clock()
    ecr =( '\n'.join('{}: {}'.format(*k) for k in enumerate(myList)) )
    A.append(clock()-t0)

    t0 = clock()
    ecr = '\n'.join(str(n) + ": " + str(entry) for (n, entry) in zip(range(0,len(myList)), myList))
    B.append(clock()-t0)

    t0 = clock()
    ecr = '\n'.join(map(lambda x: '%s: %s' % x, enumerate(myList)))
    C.append(clock()-t0)

    t0 = clock()
    ecr = '\n'.join('%s: %s' % x for x in enumerate(myList))
    D.append(clock()-t0)

print '\n'.join(('t1 = '+str(min(A))+'   '+'{:.1%}.'.format(min(A)/min(D)),
                 't2 = '+str(min(B))+'   '+'{:.1%}.'.format(min(B)/min(D)),
                 't3 = '+str(min(C))+'   '+'{:.1%}.'.format(min(C)/min(D)),
                 't4 = '+str(min(D))+'   '+'{:.1%}.'.format(min(D)/min(D))))

For n=500:

150.8%.
142.7%.
110.8%.
100.0%.

For n=5000:

153.5%.
176.2%.
109.7%.
100.0%.

Oh, I see now: only the solution 3 with map() fits with the title of the question.

How to do sed like text replace with python?

If I want something like sed, then I usually just call sed itself using the sh library.

from sh import sed

sed(['-i', 's/^# deb/deb/', '/etc/apt/sources.list'])

Sure, there are downsides. Like maybe the locally installed version of sed isn't the same as the one you tested with. In my cases, this kind of thing can be easily handled at another layer (like by examining the target environment beforehand, or deploying in a docker image with a known version of sed).

How to display a "busy" indicator with jQuery?

The jQuery documentation recommends doing something like the following:

$( document ).ajaxStart(function() {
  $( "#loading" ).show();
}).ajaxStop(function() {
  $( "#loading" ).hide();
});

Where #loading is the element with your busy indicator in it.

References:

http://api.jquery.com/ajaxStart/
http://api.jquery.com/ajaxStop/
In addition, jQuery.ajaxSetup API explicitly recommends avoiding jQuery.ajaxSetup for these:

Note: Global callback functions should be set with their respective global Ajax event handler methods—.ajaxStart(), .ajaxStop(), .ajaxComplete(), .ajaxError(), .ajaxSuccess(), .ajaxSend()—rather than within the options object for $.ajaxSetup().

How do I declare an array of undefined or no initial size?

Here's a sample program that reads stdin into a memory buffer that grows as needed. It's simple enough that it should give some insight in how you might handle this kind of thing. One thing that's would probably be done differently in a real program is how must the array grows in each allocation - I kept it small here to help keep things simpler if you wanted to step through in a debugger. A real program would probably use a much larger allocation increment (often, the allocation size is doubled, but if you're going to do that you should probably 'cap' the increment at some reasonable size - it might not make sense to double the allocation when you get into the hundreds of megabytes).

Also, I used indexed access to the buffer here as an example, but in a real program I probably wouldn't do that.

#include <stdlib.h>
#include <stdio.h>


void fatal_error(void);

int main( int argc, char** argv)
{
    int buf_size = 0;
    int buf_used = 0;

    char* buf = NULL;
    char* tmp = NULL;    

    char c;
    int i = 0;

    while ((c = getchar()) != EOF) {
        if (buf_used == buf_size) {
             //need more space in the array

             buf_size += 20;
             tmp = realloc(buf, buf_size); // get a new larger array
             if (!tmp) fatal_error();

             buf = tmp;
        }

        buf[buf_used] = c; // pointer can be indexed like an array
        ++buf_used;
    }

    puts("\n\n*** Dump of stdin ***\n");

    for (i = 0; i < buf_used; ++i) {
        putchar(buf[i]);
    }

    free(buf);

    return 0;
}

void fatal_error(void)
{
    fputs("fatal error - out of memory\n", stderr);
    exit(1);
}

This example combined with examples in other answers should give you an idea of how this kind of thing is handled at a low level.

PHP append one array to another (not array_push or +)

Another way to do this in PHP 5.6+ would be to use the ... token

$a = array('a', 'b');
$b = array('c', 'd');

array_push($a, ...$b);

// $a is now equals to array('a','b','c','d');

This will also work with any Traversable

$a = array('a', 'b');
$b = new ArrayIterator(array('c', 'd'));

array_push($a, ...$b);

// $a is now equals to array('a','b','c','d');

A warning though:

in PHP versions before 7.3 this will cause a fatal error if $b is an empty array or not traversable e.g. not an array
in PHP 7.3 a warning will be raised if $b is not traversable

More Pythonic Way to Run a Process X Times

The for loop is definitely more pythonic, as it uses Python's higher level built in functionality to convey what you're doing both more clearly and concisely. The overhead of range vs xrange, and assigning an unused i variable, stem from the absence of a statement like Verilog's repeat statement. The main reason to stick to the for range solution is that other ways are more complex. For instance:

from itertools import repeat

for unused in repeat(None, 10):
    del unused   # redundant and inefficient, the name is clear enough
    print "This is run 10 times"

Using repeat instead of range here is less clear because it's not as well known a function, and more complex because you need to import it. The main style guides if you need a reference are PEP 20 - The Zen of Python and PEP 8 - Style Guide for Python Code.

We also note that the for range version is an explicit example used in both the language reference and tutorial, although in that case the value is used. It does mean the form is bound to be more familiar than the while expansion of a C-style for loop.

Generating all permutations of a given string

/** Returns an array list containing all
 * permutations of the characters in s. */
public static ArrayList<String> permute(String s) {
    ArrayList<String> perms = new ArrayList<>();
    int slen = s.length();
    if (slen > 0) {
        // Add the first character from s to the perms array list.
        perms.add(Character.toString(s.charAt(0)));

        // Repeat for all additional characters in s.
        for (int i = 1;  i < slen;  ++i) {

            // Get the next character from s.
            char c = s.charAt(i);

            // For each of the strings currently in perms do the following:
            int size = perms.size();
            for (int j = 0;  j < size;  ++j) {

                // 1. remove the string
                String p = perms.remove(0);
                int plen = p.length();

                // 2. Add plen + 1 new strings to perms.  Each new string
                //    consists of the removed string with the character c
                //    inserted into it at a unique location.
                for (int k = 0;  k <= plen;  ++k) {
                    perms.add(p.substring(0, k) + c + p.substring(k));
                }
            }
        }
    }
    return perms;
}

Can CSS force a line break after each word in an element?

An alternative solution is described on Separate sentence to one word per line, by applying display:table-caption; to the element

Usage of sys.stdout.flush() method

As per my understanding sys.stdout.flush() pushes out all the data that has been buffered to that point to a file object. While using stdout, data is stored in buffer memory (for some time or until the memory gets filled) before it gets written to terminal. Using flush() forces to empty the buffer and write to terminal even before buffer has empty space.

Html5 Placeholders with .NET MVC 3 Razor EditorFor extension?

I think create a custom EditorTemplate is not good solution, beause you need to care about many possible tepmlates for different cases: strings, numsers, comboboxes and so on. Other solution is custom extention to HtmlHelper.

Model:

public class MyViewModel
{
    [PlaceHolder("Enter title here")]
    public string Title { get; set; }
}

Html helper extension:

   public static MvcHtmlString BsEditorFor<TModel, TValue>(this HtmlHelper<TModel> htmlHelper,
    Expression<Func<TModel, TValue>> expression, string htmlClass = "")
{
    var modelMetadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
    var metadata = modelMetadata;

    var viewData = new
    {
        HtmlAttributes = new
            {
                @class = htmlClass,
                placeholder = metadata.Watermark,
            }
    };
    return htmlHelper.EditorFor(expression, viewData);

}

A corresponding view:

@Html.BsEditorFor(x => x.Title)

Access parent URL from iframe

Try it:

document.referrer

When you change you are in a iframe your host is "referrer".

How to "perfectly" override a dict?

After trying out both of the top two suggestions, I've settled on a shady-looking middle route for Python 2.7. Maybe 3 is saner, but for me:

class MyDict(MutableMapping):
   # ... the few __methods__ that mutablemapping requires
   # and then this monstrosity
   @property
   def __class__(self):
       return dict

which I really hate, but seems to fit my needs, which are:

can override **my_dict
- if you inherit from dict, this bypasses your code. try it out.
- this makes #2 unacceptable for me at all times, as this is quite common in python code
masquerades as isinstance(my_dict, dict)
- rules out MutableMapping alone, so #1 is not enough
- I heartily recommend #1 if you don't need this, it's simple and predictable
fully controllable behavior
- so I cannot inherit from dict

If you need to tell yourself apart from others, personally I use something like this (though I'd recommend better names):

def __am_i_me(self):
  return True

@classmethod
def __is_it_me(cls, other):
  try:
    return other.__am_i_me()
  except Exception:
    return False

As long as you only need to recognize yourself internally, this way it's harder to accidentally call __am_i_me due to python's name-munging (this is renamed to _MyDict__am_i_me from anything calling outside this class). Slightly more private than _methods, both in practice and culturally.

So far I have no complaints, aside from the seriously-shady-looking __class__ override. I'd be thrilled to hear of any problems that others encounter with this though, I don't fully understand the consequences. But so far I've had no problems whatsoever, and this allowed me to migrate a lot of middling-quality code in lots of locations without needing any changes.

As evidence: https://repl.it/repls/TraumaticToughCockatoo

Basically: copy the current #2 option, add print 'method_name' lines to every method, and then try this and watch the output:

d = LowerDict()  # prints "init", or whatever your print statement said
print '------'
splatted = dict(**d)  # note that there are no prints here

You'll see similar behavior for other scenarios. Say your fake-dict is a wrapper around some other datatype, so there's no reasonable way to store the data in the backing-dict; **your_dict will be empty, regardless of what every other method does.

This works correctly for MutableMapping, but as soon as you inherit from dict it becomes uncontrollable.

Edit: as an update, this has been running without a single issue for almost two years now, on several hundred thousand (eh, might be a couple million) lines of complicated, legacy-ridden python. So I'm pretty happy with it :)

Edit 2: apparently I mis-copied this or something long ago. @classmethod __class__ does not work for isinstance checks - @property __class__ does: https://repl.it/repls/UnitedScientificSequence

What are the differences between C, C# and C++ in terms of real-world applications?

C is the bare-bones, simple, clean language that makes you do everything yourself. It doesn't hold your hand, it doesn't stop you from shooting yourself in the foot. But it has everything you need to do what you want.

C++ is C with classes added, and then a whole bunch of other things, and then some more stuff. It doesn't hold your hand, but it'll let you hold your own hand, with add-on GC, or RAII and smart-pointers. If there's something you want to accomplish, chances are there's a way to abuse the template system to give you a relatively easy syntax for it. (moreso with C++0x). This complexity also gives you the power to accidentally create a dozen instances of yourself and shoot them all in the foot.

C# is Microsoft's stab at improving on C++ and Java. Tons of syntactical features, but no where near the complexity of C++. It runs in a full managed environment, so memory management is done for you. It does let you "get dirty" and use unsafe code if you need to, but it's not the default, and you have to do some work to shoot yourself.

How can I get useful error messages in PHP?

error_reporting(E_ALL | E_STRICT);

And turn on display errors in php.ini

Select all DIV text with single mouse click

Niko Lay: How about this simple solution? :)

`<input style="background-color:white; border:1px white solid;" onclick="this.select();" id="selectable" value="http://example.com/page.htm">`

.....

Code before:

<textarea rows="20" class="codearea" style="padding:5px;" readonly="readonly">

Code after:

<textarea rows="20" class="codearea" style="padding:5px;" readonly="readonly" onclick="this.select();" id="selectable">

Just this part onclick="this.select();" id="selectable" in my code worked fine. Selects all in my code box with one mouse click.

Thanks for help Niko Lay!

How can I clear the input text after clicking

This worked for me:

    **//Click The Button**    
    $('#yourButton').click(function(){

         **//What you want to do with your button**
         //YOUR CODE COMES HERE

         **//CLEAR THE INPUT**
         $('#yourInput').val('');

});

So first, you select your button with jQuery:

$('#button').click(function((){ //Then you get the input element $('#input')
    //Then you clear the value by adding:
    .val(' '); });

Random integer in VB.NET

Dim rnd As Random = New Random
rnd.Next(n)

System.drawing namespace not found under console application

You need to add a reference to System.Drawing.dll.

As mentioned in the comments below this can be done as follows: In your Solution Explorer (Where all the files are shown with your project), right click the "References" folder and find System.Drawing on the .NET Tab.

Use dynamic variable names in JavaScript

Although this have an accepted answer I would like to add an observation:

In ES6 using let doesn't work:

_x000D_

/*this is NOT working*/_x000D_
let t = "skyBlue",_x000D_
    m = "gold",_x000D_
    b = "tomato";_x000D_
_x000D_
let color = window["b"];_x000D_
console.log(color);

_x000D_

However using var works

_x000D_

/*this IS working*/_x000D_
var t = "skyBlue",_x000D_
    m = "gold",_x000D_
    b = "tomato";_x000D_
_x000D_
let color = window["b"];_x000D_
console.log(color);

_x000D_

I hope this may be useful to some.

How to link a folder with an existing Heroku app

heroku login 

git init

heroku git:remote -a app-name123

then check the remote repo :

git remote -v

Remove final character from string

Simple:

st =  "abcdefghij"
st = st[:-1]

There is also another way that shows how it is done with steps:

list1 = "abcdefghij"
list2 = list(list1)
print(list2)
list3 = list2[:-1]
print(list3)

This is also a way with user input:

list1 = input ("Enter :")
list2 = list(list1)
print(list2)
list3 = list2[:-1]
print(list3)

To make it take away the last word in a list:

list1 = input("Enter :")
list2 = list1.split()
print(list2)
list3 = list2[:-1]
print(list3)

Can a WSDL indicate the SOAP version (1.1 or 1.2) of the web service?

Found transport-attribute in binding-element which tells us that this is the WSDL 1.1 binding for the SOAP 1.1 HTTP binding.

ex.

<wsdlsoap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>

What is the difference between Session.Abandon() and Session.Clear()

Existence of sessionid can cause the session fixation attack that is one of the point in PCI compliance. To remove the sessionid and overcome the session fixation attack, read this solution - How to avoid the Session fixation vulnerability in ASP.NET?.

Unnamed/anonymous namespaces vs. static functions

Having learned of this feature only just now while reading your question, I can only speculate. This seems to provide several advantages over a file-level static variable:

Anonymous namespaces can be nested within one another, providing multiple levels of protection from which symbols can not escape.
Several anonymous namespaces could be placed in the same source file, creating in effect different static-level scopes within the same file.

I'd be interested in learning if anyone has used anonymous namespaces in real code.

error, string or binary data would be truncated when trying to insert

In one of the INSERT statements you are attempting to insert a too long string into a string (varchar or nvarchar) column.

If it's not obvious which INSERT is the offender by a mere look at the script, you could count the <1 row affected> lines that occur before the error message. The obtained number plus one gives you the statement number. In your case it seems to be the second INSERT that produces the error.

How exactly does <script defer="defer"> work?

The real answer is: Because you cannot trust defer.

In concept, defer and async differ as follows:

async allows the script to be downloaded in the background without blocking. Then, the moment it finishes downloading, rendering is blocked and that script executes. Render resumes when the script has executed.

defer does the same thing, except claims to guarantee that scripts execute in the order they were specified on the page, and that they will be executed after the document has finished parsing. So, some scripts may finish downloading then sit and wait for scripts that downloaded later but appeared before them.

Unfortunately, due to what is really a standards cat fight, defer's definition varies spec to spec, and even in the most recent specs doesn't offer a useful guarantee. As answers here and this issue demonstrate, browsers implement defer differently:

In certain situations some browsers have a bug that causes defer scripts to run out of order.
Some browsers delay the DOMContentLoaded event until after the defer scripts have loaded, and some don't.
Some browsers obey defer on <script> elements with inline code and without a src attribute, and some ignore it.

Fortunately the spec does at least specify that async overrides defer. So you can treat all scripts as async and get a wide swath of browser support like so:

<script defer async src="..."></script>

98% of browsers in use worldwide and 99% in the US will avoid blocking with this approach.

(If you need to wait until the document has finished parsing, listen to the event DOMContentLoaded event or use jQuery's handy .ready() function. You'd want to do this anyway to fall back gracefully on browsers that don't implement defer at all.)

How do I multiply each element in a list by a number?

Since I think you are new with Python, lets do the long way, iterate thru your list using for loop and multiply and append each element to a new list.

using for loop

lst = [5, 20 ,15]
product = []
for i in lst:
    product.append(i*5)
print product

using list comprehension, this is also same as using for-loop but more 'pythonic'

lst = [5, 20 ,15]

prod = [i * 5 for i in lst]
print prod

Array from dictionary keys in swift

extension Array {
    public func toDictionary<Key: Hashable>(with selectKey: (Element) -> Key) -> [Key:Element] {
        var dict = [Key:Element]()
        for element in self {
            dict[selectKey(element)] = element
        }
        return dict
    }
}

How to send email from localhost WAMP Server to send email Gmail Hotmail or so forth?

Configuring a working email client from localhost is quite a chore, I have spent hours of frustration attempting it. At last I have found this way to send mails (using WAMP, XAMPP, etc.):

Install hMailServer

Configure this hMailServer setting:

Open hMailServer Administrator.
Click the "Add domain ..." button to create a new domain.
Under the domain text field, enter your computer's localhost IP.
- Example: 127.0.0.1 is your localhost IP.
Click the "Save" button.
Now go to Settings > Protocols > SMTP and select the "Delivery of Email" tab.
Find the localhost field enter "localhost".
Click the Save button.

Configure your Gmail account, perform following modification:

Go to Settings > Protocols > SMTP and select "Delivery of Email" tab.
Enter "smtp.gmail.com" in the Remote Host name field.
Enter "465" as the port number.
Check "Server requires authentication".
Enter your Google Mail address in the Username field.
Enter your Google Mail password in the password field.
Check mark "Use SSL"
Save all changes.

Optional

If you want to send email from another computer you need to allow deliveries from External to External accounts by following steps:

Go to Settings > Advanced > IP Ranges and double click on "My Computer" which should have IP address of 127.0.0.1
Check the Allow Deliveries from External to External accounts Checkbox.
Save settings using Save button.

Using lambda expressions for event handlers

EventHandler handler = (s, e) => MessageBox.Show("Woho");

button.Click += handler;
button.Click -= handler;

How to return data from promise

One of the fundamental principles behind a promise is that it's handled asynchronously. This means that you cannot create a promise and then immediately use its result synchronously in your code (e.g. it's not possible to return the result of a promise from within the function that initiated the promise).

What you likely want to do instead is to return the entire promise itself. Then whatever function needs its result can call .then() on the promise, and the result will be there when the promise has been resolved.

Here is a resource from HTML5Rocks that goes over the lifecycle of a promise, and how its output is resolved asynchronously:
http://www.html5rocks.com/en/tutorials/es6/promises/

How to change UINavigationBar background color from the AppDelegate

In Swift 4.2 and Xcode 10.1

You can change your navigation bar colour from your AppDelegate directly to your entire project.

In didFinishLaunchingWithOptions launchOptions: write below to lines of code

UINavigationBar.appearance().tintColor = UIColor.white
UINavigationBar.appearance().barTintColor = UIColor(red: 2/255, green: 96/255, blue: 130/255, alpha: 1.0)

Here

tintColor is for to set background images like back button & menu lines images etc. (See below left and right menu image)

barTintColor is for navigation bar background colour

If you want to set specific view controller navigation bar colour, write below code in viewDidLoad()

//Add navigation bar colour
navigationController?.navigationBar.barTintColor = UIColor(red: 2/255, green: 96/255, blue: 130/255, alpha: 1.0)
navigationController?.navigationBar.tintColor = UIColor.white

How do I format currencies in a Vue component?

With vuejs 2, you could use vue2-filters which does have other goodies as well.

npm install vue2-filters


import Vue from 'vue'
import Vue2Filters from 'vue2-filters'

Vue.use(Vue2Filters)

Then use it like so:

{{ amount | currency }} // 12345 => $12,345.00

Ref: https://www.npmjs.com/package/vue2-filters

'mat-form-field' is not a known element - Angular 5 & Material2

I had this problem too. It turned out I forgot to include one of the components in app.module.ts

Filtering a spark dataframe based on date

In PySpark(python) one of the option is to have the column in unix_timestamp format.We can convert string to unix_timestamp and specify the format as shown below. Note we need to import unix_timestamp and lit function

from pyspark.sql.functions import unix_timestamp, lit

df.withColumn("tx_date", to_date(unix_timestamp(df_cast["date"], "MM/dd/yyyy").cast("timestamp")))

Now we can apply the filters

df_cast.filter(df_cast["tx_date"] >= lit('2017-01-01')) \
       .filter(df_cast["tx_date"] <= lit('2017-01-31')).show()

remove / reset inherited css from an element

Only set the relevant / important CSS properties.

Example (only change the attributes which may cause your div to look completely different):

background: #FFF;
border: none;
color: #000;
display: block;
font: initial;
height: auto;
letter-spacing: normal;
line-height: normal;
margin: 0;
padding: 0;
text-transform: none;
visibility: visible;
width: auto;
word-spacing: normal;
z-index: auto;

Choose a very specific selector, such as div#donttouchme, <div id="donttouchme"></div>. Additionally, you can add `!important before every semicolon in the declaration. Your customers are deliberately trying to mess up your lay-out when this option fails.

Detect URLs in text with JavaScript

Based on Crescent Fresh answer

if you want to detect links with http:// OR without http:// and by www. you can use the following

function urlify(text) {
    var urlRegex = /(((https?:\/\/)|(www\.))[^\s]+)/g;
    //var urlRegex = /(https?:\/\/[^\s]+)/g;
    return text.replace(urlRegex, function(url,b,c) {
        var url2 = (c == 'www.') ?  'http://' +url : url;
        return '<a href="' +url2+ '" target="_blank">' + url + '</a>';
    }) 
}

SQL Switch/Case in 'where' clause

declare @locationType varchar(50);
declare @locationID int;

SELECT column1, column2
FROM viewWhatever
WHERE
@locationID = 
  CASE @locationType
      WHEN 'location' THEN account_location
      WHEN 'area' THEN xxx_location_area 
      WHEN 'division' THEN xxx_location_division 
  END

When do I need to use AtomicBoolean in Java?

The AtomicBoolean class gives you a boolean value that you can update atomically. Use it when you have multiple threads accessing a boolean variable.

The java.util.concurrent.atomic package overview gives you a good high-level description of what the classes in this package do and when to use them. I'd also recommend the book Java Concurrency in Practice by Brian Goetz.

Java : Cannot format given Object as a Date

You have one DateFormat, but you need two: one for the input, and another for the output.

You've got one for the output, but I don't see anything that would match your input. When you give the input string to the output format, it's no surprise that you see that exception.

DateFormat inputDateFormat = new SimpleDateFormat("yyyy-MM-ddhh:mm:ss.SSS-Z");

JavaScript CSS how to add and remove multiple CSS classes to an element

ClassList add

_x000D_

var dynamic=document.getElementById("dynamic");
dynamic.classList.add("red");
dynamic.classList.add("size");
dynamic.classList.add("bold");

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.red{
color:red;
}
.size{
font-size:40px;
}
.bold{
font-weight:800;
}

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<div id="dynamic">dynamic css</div>

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TypeError: tuple indices must be integers, not str

I think you should do

for index, row in result:

If you wanna access by name.

Iterate over a Javascript associative array in sorted order

You can use the keys function from the underscore.js library to get the keys, then the sort() array method to sort them:

var sortedKeys = _.keys(dict).sort();

The keys function in the underscore's source code:

// Retrieve the names of an object's properties.
// Delegates to **ECMAScript 5**'s native `Object.keys`
_.keys = nativeKeys || function(obj) {
    if (obj !== Object(obj)) throw new TypeError('Invalid object');
    var keys = [];
    for (var key in obj) if (_.has(obj, key)) keys.push(key);
    return keys;
};    

// Shortcut function for checking if an object has a given property directly
// on itself (in other words, not on a prototype).
_.has = function(obj, key) {
    return hasOwnProperty.call(obj, key);
};

Remove a specific character using awk or sed

tr can be more concise for removing characters than sed or awk, especially when you want to remove different characters from a string.

Removing double quotes:

echo '"Hi"' | tr -d \"
# Produces Hi without quotes

Removing different kinds of brackets:

echo '[{Hi}]' | tr -d {}[]
# Produces Hi without brackets

-d stands for "delete".

Centering in CSS Grid

Try using flex:

Plunker demo : https://plnkr.co/edit/nk02ojKuXD2tAqZiWvf9

/* Styles go here */

html,
body {
  margin: 0;
  padding: 0;
}

.container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 100vh;
  grid-gap: 0px 0px;
}

.left_bg {
  background-color: #3498db;
  grid-column: 1 / 1;
  grid-row: 1 / 1;
  z-index: 0;
  display: flex;
  justify-content: center;
  align-items: center;

}

.right_bg {
  background-color: #ecf0f1;
  grid-column: 2 / 2;
  grid_row: 1 / 1;
  z-index: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.text {
  font-family: Raleway;
  font-size: large;
  text-align: center;
}

HTML

    <div class="container">
  <!--everything on the page-->

  <div class="left_bg">
    <!--left background color of the page-->
    <div class="text">
      <!--left side text content-->
      <p>Review my stuff</p>
    </div>
  </div>

  <div class="right_bg">
    <!--right background color of the page-->
    <div class="text">
      <!--right side text content-->
      <p>Hire me!</p>
    </div>
  </div>
</div>

Change an image with onclick()

How about this? It doesn't require so much coding.

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$(".plus").click(function(){
 $(this).toggleClass("minus")  ; 
})

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.plus{
    background-image: url("https://cdn0.iconfinder.com/data/icons/ie_Bright/128/plus_add_blue.png");
    width:130px;
    height:130px;
    background-repeat:no-repeat;
}

.plus.minus{
    background-image: url("https://cdn0.iconfinder.com/data/icons/ie_Bright/128/plus_add_minus.png");
    width:130px;
    height:130px;
    background-repeat:no-repeat;
}

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<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<a href="#"><div class="plus">CHANGE</div></a>

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How can I tell jackson to ignore a property for which I don't have control over the source code?

Annotation based approach is better. But sometimes manual operation is needed. For this purpose you can use without method of ObjectWriter.

ObjectMapper mapper   = new ObjectMapper().configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
ObjectWriter writer   = mapper.writer().withoutAttribute("property1").withoutAttribute("property2");
String       jsonText = writer.writeValueAsString(sourceObject);

How do I do multiple CASE WHEN conditions using SQL Server 2008?

This can be an efficient way of performing different tests on a single statement

select
case colour_txt 
  when 'red' then 5 
  when 'green' then 4 
  when 'orange' then 3
else 0 
end as Pass_Flag

this only works on equality comparisons!

efficient way to implement paging

The approach that I am giving is the fastest pagination that SQL server can achieve. I have tested this on 5 million records. This approach is far better than "OFFSET 10 ROWS FETCH NEXT 10 ROWS ONLY" provided by SQL Server.

-- The below given code computes the page numbers and the max row of previous page
-- Replace <<>> with the correct table data.
-- Eg. <<IdentityColumn of Table>> can be EmployeeId and <<Table>> will be dbo.Employees

DECLARE @PageNumber int=1; --1st/2nd/nth page. In stored proc take this as input param.
DECLARE @NoOfRecordsPerPage int=1000;

 DECLARE @PageDetails TABLE
       (
        <<IdentityColumn of Table>> int,
        rownum int,
        [PageNumber] int
       )           
       INSERT INTO @PageDetails values(0, 0, 0)
       ;WITH CTE AS
       (
       SELECT <<IdentityColumn of Table>>, ROW_NUMBER() OVER(ORDER BY <<IdentityColumn of Table>>) rownum FROM <<Table>>
       )
       Insert into @PageDetails 
       SELECT <<IdentityColumn of Table>>, CTE.rownum, ROW_NUMBER() OVER (ORDER BY rownum) as [PageNumber] FROM CTE WHERE CTE.rownum%@NoOfRecordsPerPage=0


--SELECT * FROM @PageDetails 

-- Actual pagination
SELECT TOP (@NoOfRecordsPerPage)
FROM <<Table>> AS <<Table>>
WHERE <<IdentityColumn of Table>> > (SELECT <<IdentityColumn of Table>> FROM 
@PageDetails WHERE PageNumber=@PageNumber)
ORDER BY <<Identity Column of Table>>

SQL: Insert all records from one table to another table without specific the columns

Per this other post: Insert all values of a..., you can do the following:

INSERT INTO new_table (Foo, Bar, Fizz, Buzz)
SELECT Foo, Bar, Fizz, Buzz
FROM initial_table

It's important to specify the column names as indicated by the other answers.

Convert text into number in MySQL query

if your primary key is a string in a format like

ABC/EFG/EE/13/123(sequence number)
this sort of string can be easily used for sorting with the delimiter("/")

we can use the following query to order a table with this type of key

SELECT * FROM `TABLE_NAME` ORDER BY 
CONVERT(REVERSE(SUBSTRING(REVERSE(`key_column_name`), 1, LOCATE('/', REVERSE(`key_column_name`)) - 1)) , UNSIGNED INTEGER) DESC

Angular 2 - Checking for server errors from subscribe

As stated in the relevant RxJS documentation, the .subscribe() method can take a third argument that is called on completion if there are no errors.

For reference:

[onNext] (Function): Function to invoke for each element in the observable sequence.

[onError] (Function): Function to invoke upon exceptional termination of the observable sequence.

[onCompleted] (Function): Function to invoke upon graceful termination of the observable sequence.

Therefore you can handle your routing logic in the onCompleted callback since it will be called upon graceful termination (which implies that there won't be any errors when it is called).

this.httpService.makeRequest()
    .subscribe(
      result => {
        // Handle result
        console.log(result)
      },
      error => {
        this.errors = error;
      },
      () => {
        // 'onCompleted' callback.
        // No errors, route to new page here
      }
    );

As a side note, there is also a .finally() method which is called on completion regardless of the success/failure of the call. This may be helpful in scenarios where you always want to execute certain logic after an HTTP request regardless of the result (i.e., for logging purposes or for some UI interaction such as showing a modal).

Rx.Observable.prototype.finally(action)

Invokes a specified action after the source observable sequence terminates gracefully or exceptionally.

For instance, here is a basic example:

import { Observable } from 'rxjs/Rx';
import 'rxjs/add/operator/finally';

// ...

this.httpService.getRequest()
    .finally(() => {
      // Execute after graceful or exceptionally termination
      console.log('Handle logging logic...');
    })
    .subscribe (
      result => {
        // Handle result
        console.log(result)
      },
      error => {
        this.errors = error;
      },
      () => {
        // No errors, route to new page
      }
    );

Python string prints as [u'String']

encode("latin-1") helped me in my case:

facultyname[0].encode("latin-1")

Where is body in a nodejs http.get response?

Just an improved version to nkron responce.

const httpGet = url => {
  return new Promise((resolve, reject) => {
    http.get(url, res => {
      res.setEncoding('utf8');
      const body = [];
      res.on('data', chunk => body.push(chunk));
      res.on('end', () => resolve(body.join('')));
    }).on('error', reject);
  });
};

Appending chunks in an string[] is better for memory usage, the join(''), will allocate new memory only once.

How to add Date Picker Bootstrap 3 on MVC 5 project using the Razor engine?

Simple:

[DataType(DataType.Date)]
Public DateTime Ldate {get;set;}

How can I set the request header for curl?

To pass multiple headers in a curl request you simply add additional -H or --header to your curl command.

Example

//Simplified
$ curl -v -H 'header1:val' -H 'header2:val' URL

//Explanatory
$ curl -v -H 'Connection: keep-alive' -H 'Content-Type: application/json'  https://www.example.com

Going Further

For standard HTTP header fields such as User-Agent, Cookie, Host, there is actually another way to setting them. The curl command offers designated options for setting these header fields:

-A (or --user-agent): set "User-Agent" field.
-b (or --cookie): set "Cookie" field.
-e (or --referer): set "Referer" field.
-H (or --header): set "Header" field

For example, the following two commands are equivalent. Both of them change "User-Agent" string in the HTTP header.

    $ curl -v -H "Content-Type: application/json" -H "User-Agent: UserAgentString" https://www.example.com
    $ curl -v -H "Content-Type: application/json" -A "UserAgentString" https://www.example.com

error: expected declaration or statement at end of input in c

For me this problem was caused by a missing ) at the end of an if statement in a function called by the function the error was reported as from. Try scrolling up in the output to find the first error reported by the compiler. Fixing that error may fix this error.

GitLab git user password

For my case, it turns out the gitlab was runnign in docker, and has port mapping 4022/22.

Thus I have to edit ~/.ssh/config to specify the port via Port 4022, e.g:

Host gitlab-local
    Hostname        192.168.1.101
    User git
    Port 4022
    IdentityFile    ~/.ssh/id_rsa.pub
    # LogLevel DEBUG3

Remove scroll bar track from ScrollView in Android

To remove a scrollbar from a view (and its subclass) via xml:

android:scrollbars="none"

http://developer.android.com/reference/android/view/View.html#attr_android:scrollbars

What's the common practice for enums in Python?

I've seen this pattern several times:

>>> class Enumeration(object):
        def __init__(self, names):  # or *names, with no .split()
            for number, name in enumerate(names.split()):
                setattr(self, name, number)

>>> foo = Enumeration("bar baz quux")
>>> foo.quux
2

You can also just use class members, though you'll have to supply your own numbering:

>>> class Foo(object):
        bar  = 0
        baz  = 1
        quux = 2

>>> Foo.quux
2

If you're looking for something more robust (sparse values, enum-specific exception, etc.), try this recipe.

Hide html horizontal but not vertical scrollbar

For me:

.ui-jqgrid .ui-jqgrid-bdiv {
   position: relative;
   margin: 0;
   padding: 0;
   overflow-y: auto;  <------
   overflow-x: hidden; <-----
   text-align: left;
}

Of course remove the arrows

difference between throw and throw new Exception()

throw re-throws the caught exception, retaining the stack trace, while throw new Exception loses some of the details of the caught exception.

You would normally use throw by itself to log an exception without fully handling it at that point.

BlackWasp has a good article sufficiently titled Throwing Exceptions in C#.

VBA copy rows that meet criteria to another sheet

After formatting the previous answer to my own code, I have found an efficient way to copy all necessary data if you are attempting to paste the values returned via AutoFilter to a separate sheet.

With .Range("A1:A" & LastRow)
    .Autofilter Field:=1, Criteria1:="=*" & strSearch & "*"
    .Offset(1,0).SpecialCells(xlCellTypeVisible).Cells.Copy
    Sheets("Sheet2").activate
    DestinationRange.PasteSpecial
End With

In this block, the AutoFilter finds all of the rows that contain the value of strSearch and filters out all of the other values. It then copies the cells (using offset in case there is a header), opens the destination sheet and pastes the values to the specified range on the destination sheet.

Type datetime for input parameter in procedure

In this part of your SP:

IF @DateFirst <> '' and @DateLast <> ''
   set @FinalSQL  = @FinalSQL
       + '  or convert (Date,DateLog) >=     ''' + @DateFirst
       + ' and convert (Date,DateLog) <=''' + @DateLast

you are trying to concatenate strings and datetimes.

As the datetime type has higher priority than varchar/nvarchar, the + operator, when it happens between a string and a datetime, is interpreted as addition, not as concatenation, and the engine then tries to convert your string parts (' or convert (Date,DateLog) >= ''' and others) to datetime or numeric values. And fails.

That doesn't happen if you omit the last two parameters when invoking the procedure, because the condition evaluates to false and the offending statement isn't executed.

To amend the situation, you need to add explicit casting of your datetime variables to strings:

set @FinalSQL  = @FinalSQL
    + '  or convert (Date,DateLog) >=     ''' + convert(date, @DateFirst)
    + ' and convert (Date,DateLog) <=''' + convert(date, @DateLast)

You'll also need to add closing single quotes:

set @FinalSQL  = @FinalSQL
    + '  or convert (Date,DateLog) >=     ''' + convert(date, @DateFirst) + ''''
    + ' and convert (Date,DateLog) <=''' + convert(date, @DateLast) + ''''

Passing a dictionary to a function as keyword parameters

In[1]: def myfunc(a=1, b=2):
In[2]:    print(a, b)

In[3]: mydict = {'a': 100, 'b': 200}

In[4]: myfunc(**mydict)
100 200

A few extra details that might be helpful to know (questions I had after reading this and went and tested):

The function can have parameters that are not included in the dictionary
You can not override a parameter that is already in the dictionary
The dictionary can not have parameters that aren't in the function.

Examples:

Number 1: The function can have parameters that are not included in the dictionary

In[5]: mydict = {'a': 100}
In[6]: myfunc(**mydict)
100 2

Number 2: You can not override a parameter that is already in the dictionary

In[7]: mydict = {'a': 100, 'b': 200}
In[8]: myfunc(a=3, **mydict)

TypeError: myfunc() got multiple values for keyword argument 'a'

Number 3: The dictionary can not have parameters that aren't in the function.

In[9]:  mydict = {'a': 100, 'b': 200, 'c': 300}
In[10]: myfunc(**mydict)

TypeError: myfunc() got an unexpected keyword argument 'c'

As requested in comments, a solution to Number 3 is to filter the dictionary based on the keyword arguments available in the function:

In[11]: import inspect
In[12]: mydict = {'a': 100, 'b': 200, 'c': 300}
In[13]: filtered_mydict = {k: v for k, v in mydict.items() if k in [p.name for p in inspect.signature(myfunc).parameters.values()]}
In[14]: myfunc(**filtered_mydict)
100 200

Another option is to accept (and ignore) additional kwargs in your function:

In[15]: def myfunc2(a=None, **kwargs):
In[16]:    print(a)

In[17]: mydict = {'a': 100, 'b': 200, 'c': 300}

In[18]: myfunc2(**mydict)
100

Notice further than you can use positional arguments and lists or tuples in effectively the same way as kwargs, here's a more advanced example incorporating both positional and keyword args:

In[19]: def myfunc3(a, *posargs, b=2, **kwargs):
In[20]:    print(a, b)
In[21]:    print(posargs)
In[22]:    print(kwargs)

In[23]: mylist = [10, 20, 30]
In[24]: mydict = {'b': 200, 'c': 300}

In[25]: myfunc3(*mylist, **mydict)
10 200
(20, 30)
{'c': 300}

How can I pass some data from one controller to another peer controller

In one controller, you can do:

$rootScope.$broadcast('eventName', data);

and listen to the event in another:

$scope.$on('eventName', function (event, data) {...});

Are Git forks actually Git clones?

I think fork is a copy of other repository but with your account modification. for example, if you directly clone other repository locally, the remote object origin is still using the account who you clone from. You can't commit and contribute your code. It is just a pure copy of codes. Otherwise, If you fork a repository, it will clone the repo with the update of your account setting in you github account. And then cloning the repo in the context of your account, you can commit your codes.

How to implement debounce in Vue2?

If you are using Vue you can also use v.model.lazy instead of debounce but remember v.model.lazy will not always work as Vue limits it for custom components.

For custom components you should use :value along with @change.native

<b-input :value="data" @change.native="data = $event.target.value" ></b-input>

Avoid Adding duplicate elements to a List C#

use HashSet it's better

take a look here : http://www.dotnetperls.com/hashset

Qt Creator color scheme

In newer versions of Qt Creator (Currently using 4.4.1), you can follow these simple steps:
Tools > Options > Environment > Interface

Here you can change the theme to Flat Dark.

It will change the whole Qt Creator theme, not just the editor window.

Is it possible to set a number to NaN or infinity?

Is it possible to set a number to NaN or infinity?

Yes, in fact there are several ways. A few work without any imports, while others require import, however for this answer I'll limit the libraries in the overview to standard-library and NumPy (which isn't standard-library but a very common third-party library).

The following table summarizes the ways how one can create a not-a-number or a positive or negative infinity float:

+-------------------------------------------------------------------+
¦   result ¦ NaN          ¦ Infinity           ¦ -Infinity          ¦
¦ module   ¦              ¦                    ¦                    ¦
¦----------+--------------+--------------------+--------------------¦
¦ built-in ¦ float("nan") ¦ float("inf")       ¦ -float("inf")      ¦
¦          ¦              ¦ float("infinity")  ¦ -float("infinity") ¦
¦          ¦              ¦ float("+inf")      ¦ float("-inf")      ¦
¦          ¦              ¦ float("+infinity") ¦ float("-infinity") ¦
+----------+--------------+--------------------+--------------------¦
¦ math     ¦ math.nan     ¦ math.inf           ¦ -math.inf          ¦
+----------+--------------+--------------------+--------------------¦
¦ cmath    ¦ cmath.nan    ¦ cmath.inf          ¦ -cmath.inf         ¦
+----------+--------------+--------------------+--------------------¦
¦ numpy    ¦ numpy.nan    ¦ numpy.PINF         ¦ numpy.NINF         ¦
¦          ¦ numpy.NaN    ¦ numpy.inf          ¦ -numpy.inf         ¦
¦          ¦ numpy.NAN    ¦ numpy.infty        ¦ -numpy.infty       ¦
¦          ¦              ¦ numpy.Inf          ¦ -numpy.Inf         ¦
¦          ¦              ¦ numpy.Infinity     ¦ -numpy.Infinity    ¦
+-------------------------------------------------------------------+

A couple remarks to the table:

The float constructor is actually case-insensitive, so you can also use float("NaN") or float("InFiNiTy").
The cmath and numpy constants return plain Python float objects.
The numpy.NINF is actually the only constant I know of that doesn't require the -.

It is possible to create complex NaN and Infinity with complex and cmath:

+------------------------------------------------------------------------------------------+
¦   result ¦ NaN+0j         ¦ 0+NaNj          ¦ Inf+0j              ¦ 0+Infj               ¦
¦ module   ¦                ¦                 ¦                     ¦                      ¦
¦----------+----------------+-----------------+---------------------+----------------------¦
¦ built-in ¦ complex("nan") ¦ complex("nanj") ¦ complex("inf")      ¦ complex("infj")      ¦
¦          ¦                ¦                 ¦ complex("infinity") ¦ complex("infinityj") ¦
+----------+----------------+-----------------+---------------------+----------------------¦
¦ cmath    ¦ cmath.nan ¹    ¦ cmath.nanj      ¦ cmath.inf ¹         ¦ cmath.infj           ¦
+------------------------------------------------------------------------------------------+

The options with ¹ return a plain float, not a complex.

is there any function to check whether a number is infinity or not?

Yes there is - in fact there are several functions for NaN, Infinity, and neither Nan nor Inf. However these predefined functions are not built-in, they always require an import:

+--------------------------------------------------------------+
¦      for ¦ NaN         ¦ Infinity or    ¦ not NaN and        ¦
¦          ¦             ¦ -Infinity      ¦ not Infinity and   ¦
¦ module   ¦             ¦                ¦ not -Infinity      ¦
¦----------+-------------+----------------+--------------------¦
¦ math     ¦ math.isnan  ¦ math.isinf     ¦ math.isfinite      ¦
+----------+-------------+----------------+--------------------¦
¦ cmath    ¦ cmath.isnan ¦ cmath.isinf    ¦ cmath.isfinite     ¦
+----------+-------------+----------------+--------------------¦
¦ numpy    ¦ numpy.isnan ¦ numpy.isinf    ¦ numpy.isfinite     ¦
+--------------------------------------------------------------+

Again a couple of remarks:

The cmath and numpy functions also work for complex objects, they will check if either real or imaginary part is NaN or Infinity.
The numpy functions also work for numpy arrays and everything that can be converted to one (like lists, tuple, etc.)
There are also functions that explicitly check for positive and negative infinity in NumPy: numpy.isposinf and numpy.isneginf.
Pandas offers two additional functions to check for NaN: pandas.isna and pandas.isnull (but not only NaN, it matches also None and NaT)

Even though there are no built-in functions, it would be easy to create them yourself (I neglected type checking and documentation here):

def isnan(value):
    return value != value  # NaN is not equal to anything, not even itself

infinity = float("infinity")

def isinf(value):
    return abs(value) == infinity 

def isfinite(value):
    return not (isnan(value) or isinf(value))

To summarize the expected results for these functions (assuming the input is a float):

+----------------------------------------------------------------------+
¦          input ¦ NaN   ¦ Infinity   ¦ -Infinity   ¦ something else   ¦
¦ function       ¦       ¦            ¦             ¦                  ¦
¦----------------+-------+------------+-------------+------------------¦
¦ isnan          ¦ True  ¦ False      ¦ False       ¦ False            ¦
+----------------+-------+------------+-------------+------------------¦
¦ isinf          ¦ False ¦ True       ¦ True        ¦ False            ¦
+----------------+-------+------------+-------------+------------------¦
¦ isfinite       ¦ False ¦ False      ¦ False       ¦ True             ¦
+----------------------------------------------------------------------+

Is it possible to set an element of an array to NaN in Python?

In a list it's no problem, you can always include NaN (or Infinity) there:

>>> [math.nan, math.inf, -math.inf, 1]  # python list
[nan, inf, -inf, 1]

However if you want to include it in an array (for example array.array or numpy.array) then the type of the array must be float or complex because otherwise it will try to downcast it to the arrays type!

>>> import numpy as np
>>> float_numpy_array = np.array([0., 0., 0.], dtype=float)
>>> float_numpy_array[0] = float("nan")
>>> float_numpy_array
array([nan,  0.,  0.])

>>> import array
>>> float_array = array.array('d', [0, 0, 0])
>>> float_array[0] = float("nan")
>>> float_array
array('d', [nan, 0.0, 0.0])

>>> integer_numpy_array = np.array([0, 0, 0], dtype=int)
>>> integer_numpy_array[0] = float("nan")
ValueError: cannot convert float NaN to integer

Markdown open a new window link

It is very dependent of the engine that you use for generating html files. If you are using Hugo for generating htmls you have to write down like this:

<a href="https://example.com" target="_blank" rel="noopener"><span>Example Text</span> </a>.

Get selected option from select element

Given this HTML:

<select>
    <option value="0">One</option>
    <option value="1">Two</option>
</select>

Select by description for jQuery v1.6+:

var text1 = 'Two';
$("select option").filter(function() {
    //may want to use $.trim in here
    return $(this).text() == text1; 
}).prop('selected', true);

Want custom title / image / description in facebook share link from a flash app

I had this same problem a week ago.

First of all I noticed your URL has an ampersand preceding the parameter string, but it probably needs to have a question mark instead to begin the parameter string, followed by an ampersand between each additional parameter.

Now, you do need to escape your URL but also double-escape the URL parameters (title or other content you need to provide content in the Share) you are passing to the URL, as follows:

var myParams = 't=' + escape('Some title here.') + '&id=' + escape('some content ID or any other value I want to load');
var fooBar = 'http://www.facebook.com/share.php?u=' + escape('http://foobar.com/superDuperSharingPage.php?' + myParams);

Now, you need to create the above-linked superDuperSharingPage.php, which should provide the dynamic title, description, and image content you desire. Something like this should suffice:

<?php
    // get our URL query parameters
    $title = $_GET['t'];
    $id = $_GET['id'];
    // maybe we want to load some content with the id I'll pretend we loaded a
    // description from some database in the sky which is magically arranged thusly:
    $desciption = $databaseInTheSky[$id]['description'];
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title><?php echo $title;?></title>
  <meta http-equiv="content-type" content="text/html; charset=utf-8" />
  <meta name="title" content="<?php echo $title;?>" />
  <meta name="description" content="<?php echo $desciption;?>" />
  <!-- the following line redirects to wherever we want the USER to land -->
  <!-- Facebook won't follow it. you may or may not actually want || need this. -->
  <meta http-equiv="refresh" content="1;URL=http://foobar.com" />
</head>
<body>
  <p><?php echo $desciption;?></p>
  <p><img src="image_a_<?php echo $id;?>.jpg" alt="Alt tags are always a good idea." /></p>
  <p><img src="image_b_<?php echo $id;?>.jpg" alt="Make the web more accessible to the blind!" /></p>
</body>
</html>

Let me know if this works for you, it's essentially what did for me :)

Check if checkbox is NOT checked on click - jQuery

The answer already posted will work. If you want to use the jQuery :not you can do this:

if ($(this).is(':not(:checked)'))

if ($(this).attr('checked') == false)

unix sort descending order

The presence of the n option attached to the -k5 causes the global -r option to be ignored for that field. You have to specify both n and r at the same level (globally or locally).

sort -t $'\t' -k5,5rn

sort -rn -t $'\t' -k5,5

SQL Server® 2016, 2017 and 2019 Express full download

Once you start the web installer there's an option to download media, that being the full installation package. There's even download options for what kind of package to download.

node.js - how to write an array to file

We can simply write the array data to the filesystem but this will raise one error in which ',' will be appended to the end of the file. To handle this below code can be used:

var fs = require('fs');

var file = fs.createWriteStream('hello.txt');
file.on('error', function(err) { Console.log(err) });
data.forEach(value => file.write(`${value}\r\n`));
file.end();

\r\n

is used for the new Line.

\n

won't help. Please refer this

Programmatically shut down Spring Boot application

This will make sure that the SpringBoot application is closed properly and the resources are released back to the operating system,

@Autowired
private ApplicationContext context;

@GetMapping("/shutdown-app")
public void shutdownApp() {

    int exitCode = SpringApplication.exit(context, (ExitCodeGenerator) () -> 0);
    System.exit(exitCode);
}

How do I create a pause/wait function using Qt?

To use the standard sleep function add the following in your .cpp file:

#include <unistd.h>

As of Qt version 4.8, the following sleep functions are available:

void QThread::msleep(unsigned long msecs)
void QThread::sleep(unsigned long secs)
void QThread::usleep(unsigned long usecs)

To use them, simply add the following in your .cpp file:

#include <QThread>

Reference: QThread (via Qt documentation): http://doc.qt.io/qt-4.8/qthread.html

Otherwise, perform these steps...

Modify the project file as follows:

CONFIG += qtestlib

Note that in newer versions of Qt you will get the following error:

Project WARNING: CONFIG+=qtestlib is deprecated. Use QT+=testlib instead.

... so, instead modify the project file as follows:

QT += testlib

Then, in your .cpp file, be sure to add the following:

#include <QtTest>

And then use one of the sleep functions like so:

usleep(100);

How to restart a windows service using Task Scheduler

Instead of using a bat file, you can simply create a Scheduled Task. Most of the time you define just one action. In this case, create two actions with the NET command. The first one to stop the service, the second one to start the service. Give them a STOP and START argument, followed by the service name.

In this example we restart the Printer Spooler service.

NET STOP "Print Spooler" 
NET START "Print Spooler"

Note: unfortunately NET RESTART <service name> does not exist.

vue.js 'document.getElementById' shorthand

If you're attempting to get an element you can use Vue.util.query which is really just a wrapper around document.querySelector but at 14 characters vs 22 characters (respectively) it is technically shorter. It also has some error handling in case the element you're searching for doesn't exist.

There isn't any official documentation on Vue.util, but this is the entire source of the function:

function query(el) {
  if (typeof el === 'string') {
    var selector = el;
    el = document.querySelector(el);
    if (!el) {
      ({}).NODE_ENV !== 'production' && warn('Cannot find element: ' + selector);
    }
  }
  return el;
}

Repo link: Vue.util.query

jQuery Set Cursor Position in Text Area

I'm using this: http://plugins.jquery.com/project/jCaret

Python Requests and persistent sessions

The documentation says that get takes in an optional cookies argument allowing you to specify cookies to use:

from the docs:

>>> url = 'http://httpbin.org/cookies'
>>> cookies = dict(cookies_are='working')

>>> r = requests.get(url, cookies=cookies)
>>> r.text
'{"cookies": {"cookies_are": "working"}}'

http://docs.python-requests.org/en/latest/user/quickstart/#cookies

How to call a method after a delay in Android

You can use this for Simplest Solution:

new Handler().postDelayed(new Runnable() {
    @Override
    public void run() {
        //Write your code here
    }
}, 5000); //Timer is in ms here.

Else, Below can be another clean useful solution:

new Handler().postDelayed(() -> 
{/*Do something here*/}, 
5000); //time in ms

Can CSS detect the number of children an element has?

Clarification:

Because of a previous phrasing in the original question, a few SO citizens have raised concerns that this answer could be misleading. Note that, in CSS3, styles cannot be applied to a parent node based on the number of children it has. However, styles can be applied to the children nodes based on the number of siblings they have.

Original answer:

Incredibly, this is now possible purely in CSS3.

/* one item */
li:first-child:nth-last-child(1) {
/* -or- li:only-child { */
    width: 100%;
}

/* two items */
li:first-child:nth-last-child(2),
li:first-child:nth-last-child(2) ~ li {
    width: 50%;
}

/* three items */
li:first-child:nth-last-child(3),
li:first-child:nth-last-child(3) ~ li {
    width: 33.3333%;
}

/* four items */
li:first-child:nth-last-child(4),
li:first-child:nth-last-child(4) ~ li {
    width: 25%;
}

The trick is to select the first child when it's also the nth-from-the-last child. This effectively selects based on the number of siblings.

Credit for this technique goes to André Luís (discovered) & Lea Verou (refined).

Don't you just love CSS3?

CodePen Example:

https://codepen.io/mattlubner-the-decoder/pen/ExaQZQR

Sources:

http://andr3.net/blog/post/142 (André Luís)
http://lea.verou.me/2011/01/styling-children-based-on-their-number-with-css3/ (Lea Verou)

How to select rows with NaN in particular column?

@qbzenker provided the most idiomatic method IMO

Here are a few alternatives:

In [28]: df.query('Col2 != Col2') # Using the fact that: np.nan != np.nan
Out[28]:
   Col1  Col2  Col3
1     0   NaN   0.0

In [29]: df[np.isnan(df.Col2)]
Out[29]:
   Col1  Col2  Col3
1     0   NaN   0.0

Change Circle color of radio button

For those who want to change disable, checked and enabled states you cat do the following steps:

<!-- Or androidX radio button or material design radio button -->
<android.support.v7.widget.AppCompatRadioButton
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:buttonTint="@color/black"
                    android:text="Radiobutton1"
                    app:buttonTint="@color/radio_button_color" />

then in color res folder make a file named "radio_button_color.xml":

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="@color/yellow900" android:state_selected="true" />
    <item android:color="@color/yellow800" android:state_checked="true" />
    <item android:color="@color/gray800" android:state_enabled="false" />
    <item android:color="@color/yellow800" android:state_enabled="true" />
</selector>

Mongoose: Get full list of users

My Solution

User.find()
        .exec()
        .then(users => {
            const response = {
                count: users.length,
                users: users.map(user => {

                    return {
                        _id: user._id,
                        // other property
                    }

                })

            };
            res.status(200).json(response);
        }).catch(err => {
        console.log(err);
        res.status(500).json({
            success: false
        })
    })

How to make div go behind another div?

To answer the question in a general manner:

Using z-index will allow you to control this. see z-index at csstricks.

The element of higher z-index will be displayed on top of elements of lower z-index.

For instance, take the following HTML:

<div id="first">first</div>
<div id="second">second</div>

If I have the following CSS:

#first {
    position: fixed;
    z-index: 2;
}

#second {
    position: fixed;
    z-index: 1;
}

#first wil be on top of #second.

But specifically in your case:

The div element is a child of the div that you wish to put in front. This is not logically possible.

How to read from input until newline is found using scanf()?

Sounds like a homework problem. scanf() is the wrong function to use for the problem. I'd recommend getchar() or getch().

Note: I'm purposefully not solving the problem since this seems like homework, instead just pointing you in the right direction.

Spring Data JPA and Exists query

Spring Data JPA 1.11 now supports the exists projection in repository query derivation.

See documentation here.

In your case the following will work:

public interface MyEntityRepository extends CrudRepository<MyEntity, String> {  
    boolean existsByFoo(String foo);
}

how to fix the issue "Command /bin/sh failed with exit code 1" in iphone

Target -> Build-Phases -> update examples

Click On Run checkbox if not selected.

How does one extract each folder name from a path?

There are a few ways that a file path can be represented. You should use the System.IO.Path class to get the separators for the OS, since it can vary between UNIX and Windows. Also, most (or all if I'm not mistaken) .NET libraries accept either a '\' or a '/' as a path separator, regardless of OS. For this reason, I'd use the Path class to split your paths. Try something like the following:

string originalPath = "\\server\\folderName1\\another\ name\\something\\another folder\\";
string[] filesArray = originalPath.Split(Path.AltDirectorySeparatorChar,
                              Path.DirectorySeparatorChar);

This should work regardless of the number of folders or the names.

What should be in my .gitignore for an Android Studio project?

To get a better idea, all you need are the following files

app
build.gradle
settings.gradle

You could put everything else in the .gitignore file. All your app changes lies mostly in these files and folders. The rest you see in a basic project are gradle build files or Android Studio configuration files.

If you are using Android Studio, you can use "Import project" to successfully build the project. Alternatively you can build using command line, follow Building Android Projects with Gradle.

In R, dealing with Error: ggplot2 doesn't know how to deal with data of class numeric

The error happens because of you are trying to map a numeric vector to data in geom_errorbar: GVW[1:64,3]. ggplot only works with data.frame.

In general, you shouldn't subset inside ggplot calls. You are doing so because your standard errors are stored in four separate objects. Add them to your original data.frame and you will be able to plot everything in one call.

Here with a dplyr solution to summarise the data and compute the standard error beforehand.

library(dplyr)
d <- GVW %>% group_by(Genotype,variable) %>%
    summarise(mean = mean(value),se = sd(value) / sqrt(n()))

ggplot(d, aes(x = variable, y = mean, fill = Genotype)) + 
  geom_bar(position = position_dodge(), stat = "identity", 
      colour="black", size=.3) +
  geom_errorbar(aes(ymin = mean - se, ymax = mean + se), 
      size=.3, width=.2, position=position_dodge(.9)) +
  xlab("Time") +
  ylab("Weight [g]") +
  scale_fill_hue(name = "Genotype", breaks = c("KO", "WT"), 
      labels = c("Knock-out", "Wild type")) +
  ggtitle("Effect of genotype on weight-gain") +
  scale_y_continuous(breaks = 0:20*4) +
  theme_bw()

Extract subset of key-value pairs from Python dictionary object?

You could try:

dict((k, bigdict[k]) for k in ('l', 'm', 'n'))

... or in ~~Python 3~~ Python versions 2.7 or later (thanks to Fábio Diniz for pointing that out that it works in 2.7 too):

{k: bigdict[k] for k in ('l', 'm', 'n')}

Update: As Håvard S points out, I'm assuming that you know the keys are going to be in the dictionary - see his answer if you aren't able to make that assumption. Alternatively, as timbo points out in the comments, if you want a key that's missing in bigdict to map to None, you can do:

{k: bigdict.get(k, None) for k in ('l', 'm', 'n')}

If you're using Python 3, and you only want keys in the new dict that actually exist in the original one, you can use the fact to view objects implement some set operations:

{k: bigdict[k] for k in bigdict.keys() & {'l', 'm', 'n'}}

Create Log File in Powershell

function WriteLog
{
    Param ([string]$LogString)
    $LogFile = "C:\$(gc env:computername).log"
    $DateTime = "[{0:MM/dd/yy} {0:HH:mm:ss}]" -f (Get-Date)
    $LogMessage = "$Datetime $LogString"
    Add-content $LogFile -value $LogMessage
}

WriteLog "This is my log message"

How can I tell when a MySQL table was last updated?

For a list of recent table changes use this:

SELECT UPDATE_TIME, TABLE_SCHEMA, TABLE_NAME
FROM information_schema.tables
ORDER BY UPDATE_TIME DESC, TABLE_SCHEMA, TABLE_NAME

What is the difference between the remap, noremap, nnoremap and vnoremap mapping commands in Vim?

One difference is that:

:map does nvo == normal + (visual + select) + operator pending
:map! does ic == insert + command-line mode

as stated on help map-modes tables.

So: map does not map to all modes.

To map to all modes you need both :map and :map!.

How to retrieve current workspace using Jenkins Pipeline Groovy script?

There is no variable included for that yet, so you have to use shell-out-read-file method:

sh 'pwd > workspace'
workspace = readFile('workspace').trim()

Or (if running on master node):

workspace = pwd()

Converting Java file:// URL to File(...) path, platform independent, including UNC paths

Based on the hint and link provided in Simone Giannis answer, this is my hack to fix this.

I am testing on uri.getAuthority(), because UNC path will report an Authority. This is a bug - so I rely on the existence of a bug, which is evil, but it apears as if this will stay forever (since Java 7 solves the problem in java.nio.Paths).

Note: In my context I will receive absolute paths. I have tested this on Windows and OS X.

(Still looking for a better way to do it)

package com.christianfries.test;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;

public class UNCPathTest {

    public static void main(String[] args) throws MalformedURLException, URISyntaxException {
        UNCPathTest upt = new UNCPathTest();

        upt.testURL("file://server/dir/file.txt");  // Windows UNC Path

        upt.testURL("file:///Z:/dir/file.txt");     // Windows drive letter path

        upt.testURL("file:///dir/file.txt");        // Unix (absolute) path
    }

    private void testURL(String urlString) throws MalformedURLException, URISyntaxException {
        URL url = new URL(urlString);
        System.out.println("URL is: " + url.toString());

        URI uri = url.toURI();
        System.out.println("URI is: " + uri.toString());

        if(uri.getAuthority() != null && uri.getAuthority().length() > 0) {
            // Hack for UNC Path
            uri = (new URL("file://" + urlString.substring("file:".length()))).toURI();
        }

        File file = new File(uri);
        System.out.println("File is: " + file.toString());

        String parent = file.getParent();
        System.out.println("Parent is: " + parent);

        System.out.println("____________________________________________________________");
    }

}

Formula to determine brightness of RGB color

The "Accepted" Answer is Incorrect and Incomplete

The only answers that are accurate are the @jive-dadson and @EddingtonsMonkey answers, and in support @nils-pipenbrinck. The other answers (including the accepted) are linking to or citing sources that are either wrong, irrelevant, obsolete, or broken.

Briefly:

sRGB must be LINEARIZED before applying the coefficients.
Luminance (L or Y) is linear as is light.
Perceived lightness (L*) is nonlinear as is human perception.
HSV and HSL are not even remotely accurate in terms of perception.
The IEC standard for sRGB specifies a threshold of 0.04045 it is NOT 0.03928 (that was from an obsolete early draft).
The be useful (i.e. relative to perception), Euclidian distances require a perceptually uniform Cartesian vector space such as CIELAB. sRGB is not one.

What follows is a correct and complete answer:

Because this thread appears highly in search engines, I am adding this answer to clarify the various misconceptions on the subject.

Luminance is a linear measure of light, spectrally weighted for normal vision but not adjusted for the non-linear perception of lightness. It can be a relative measure, Y as in CIEXYZ, or as L, an absolute measure in cd/m² (not to be confused with L*).

Perceived lightness is used by some vision models such as CIELAB, here L* (Lstar) is a value of perceptual lightness, and is non-linear to approximate the human vision non-linear response curve.

Brightness is a perceptual attribute, it does not have a "physical" measure. However some color appearance models do have a value, usualy denoted as "Q" for perceived brightness, which is different than perceived lightness.

Luma (Y´ prime) is a gamma encoded, weighted signal used in some video encodings (Y´I´Q´). It is not to be confused with linear luminance.

Gamma or transfer curve (TRC) is a curve that is often similar to the perceptual curve, and is commonly applied to image data for storage or broadcast to reduce perceived noise and/or improve data utilization (and related reasons).

To determine perceived lightness, first convert gamma encoded R´G´B´ image values to linear luminance (L or Y ) and then to non-linear perceived lightness (L*)

TO FIND LUMINANCE:

...Because apparently it was lost somewhere...

Step One:

Convert all sRGB 8 bit integer values to decimal 0.0-1.0

  vR = sR / 255;
  vG = sG / 255;
  vB = sB / 255;

Step Two:

Convert a gamma encoded RGB to a linear value. sRGB (computer standard) for instance requires a power curve of approximately V^2.2, though the "accurate" transform is:

Where V´ is the gamma-encoded R, G, or B channel of sRGB.
Pseudocode:

function sRGBtoLin(colorChannel) {
        // Send this function a decimal sRGB gamma encoded color value
        // between 0.0 and 1.0, and it returns a linearized value.

    if ( colorChannel <= 0.04045 ) {
            return colorChannel / 12.92;
        } else {
            return pow((( colorChannel + 0.055)/1.055),2.4));
        }
    }

Step Three:

To find Luminance (Y) apply the standard coefficients for sRGB:

Pseudocode using above functions:

Y = (0.2126 * sRGBtoLin(vR) + 0.7152 * sRGBtoLin(vG) + 0.0722 * sRGBtoLin(vB))

TO FIND PERCEIVED LIGHTNESS:

Step Four:

Take luminance Y from above, and transform to L*

Pseudocode:

function YtoLstar(Y) {
        // Send this function a luminance value between 0.0 and 1.0,
        // and it returns L* which is "perceptual lightness"

    if ( Y <= (216/24389) {       // The CIE standard states 0.008856 but 216/24389 is the intent for 0.008856451679036
            return Y * (24389/27);  // The CIE standard states 903.3, but 24389/27 is the intent, making 903.296296296296296
        } else {
            return pow(Y,(1/3)) * 116 - 16;
        }
    }

L* is a value from 0 (black) to 100 (white) where 50 is the perceptual "middle grey". L* = 50 is the equivalent of Y = 18.4, or in other words an 18% grey card, representing the middle of a photographic exposure (Ansel Adams zone V).

References:

IEC 61966-2-1:1999 Standard
Wikipedia sRGB
Wikipedia CIELAB
Wikipedia CIEXYZ
Charles Poynton's Gamma FAQ

Getting one value from a tuple

General

Single elements of a tuple a can be accessed -in an indexed array-like fashion-

via a[0], a[1], ... depending on the number of elements in the tuple.

Example

If your tuple is a=(3,"a")

a[0] yields 3,
a[1] yields "a"

Concrete answer to question

def tup():
  return (3, "hello")

tup() returns a 2-tuple.

In order to "solve"

i = 5 + tup()  # I want to add just the three

you select the 3 by

tup()[0|    #first element

so in total

i = 5 + tup()[0]

Alternatives

Go with namedtuple that allows you to access tuple elements by name (and by index). Details at https://docs.python.org/3/library/collections.html#collections.namedtuple

>>> import collections
>>> MyTuple=collections.namedtuple("MyTuple", "mynumber, mystring")
>>> m = MyTuple(3, "hello")
>>> m[0]
3
>>> m.mynumber
3
>>> m[1]
'hello'
>>> m.mystring
'hello'

How to use greater than operator with date?

Try this.

SELECT * FROM la_schedule WHERE `start_date` > '2012-11-18';

Preloading @font-face fonts?

Since 2017 you have preload

MDN: The preload value of the element's rel attribute allows you to write declarative fetch requests in your HTML , specifying resources that your pages will need very soon after loading, which you therefore want to start preloading early in the lifecycle of a page load, before the browser's main rendering machinery kicks in. This ensures that they are made available earlier and are less likely to block the page's first render, leading to performance improvements.

<link rel="preload" href="/fonts/myfont.eot" as="font" crossorigin="anonymous" />

Always check browser compatibility.

It is most useful for font preloading (not waiting for the browser to find it in some CSS). You can also preload some logos, icons and scripts.

Other techniques pro/cons are discussed here (not my blog).
Also see prefetch (similar) and SO question about preload vs prefetch.

Capturing multiple line output into a Bash variable

How about this, it will read each line to a variable and that can be used subsequently ! say myscript output is redirected to a file called myscript_output

awk '{while ( (getline var < "myscript_output") >0){print var;} close ("myscript_output");}'

How to open this .DB file?

I don't think there is a way to tell which program to use from just the .db extension. It could even be an encrypted database which can't be opened. You can MS Access, or a sqlite manager.

Edit: Try to rename the file to .txt and open it with a text editor. The first couple of words in the file could tell you the DB Type.

If it is a SQLite database, it will start with "SQLite format 3"

Vertically align text to top within a UILabel

for anyone reading this because the text inside your label is not vertically centered, keep in mind that some font types are not designed equally. for example, if you create a label with zapfino size 16, you will see the text is not perfectly centered vertically.

however, working with helvetica will vertically center your text.

Shortcuts in Objective-C to concatenate NSStrings

NSNumber *lat = [NSNumber numberWithDouble:destinationMapView.camera.target.latitude];
NSNumber *lon = [NSNumber numberWithDouble:destinationMapView.camera.target.longitude];
NSString *DesconCatenated = [NSString stringWithFormat:@"%@|%@",lat,lon];

Xcode 9 Swift Language Version (SWIFT_VERSION)

I just click on latest swift convert button and set App target build setting-> Swift language version: swift 4.0,

Hope this will help.

Lightweight XML Viewer that can handle large files

I like Microsoft's XML Notepad 2007, but I don't know how it handles very large files, sorry.

How to import and use image in a Vue single file component?

As simple as:

<template>
    <div id="app">
        <img src="./assets/logo.png">
    </div>
</template>
    
<script>
    export default {
    }
</script>
    
<style lang="css">
</style>

Taken from the project generated by vue cli.

If you want to use your image as a module, do not forget to bind data to your Vuejs component:

<template>
    <div id="app">
        <img :src="image"/>
    </div>
</template>
    
<script>
    import image from "./assets/logo.png"
    
    export default {
        data: function () {
            return {
                image: image
            }
        }
    }
</script>
    
<style lang="css">
</style>

And a shorter version:

<template>
    <div id="app">
        <img :src="require('./assets/logo.png')"/>
    </div>
</template>
    
<script>
    export default {
    }
</script>
    
<style lang="css">
</style>

How to properly create composite primary keys - MYSQL

CREATE  TABLE `mom`.`sec_subsection` (

  `idsec_sub` INT(11) NOT NULL ,

  `idSubSections` INT(11) NOT NULL ,

  PRIMARY KEY (`idsec_sub`, `idSubSections`) 

);

How to read a HttpOnly cookie using JavaScript

The whole point of HttpOnly cookies is that they can't be accessed by JavaScript.

The only way (except for exploiting browser bugs) for your script to read them is to have a cooperating script on the server that will read the cookie value and echo it back as part of the response content. But if you can and would do that, why use HttpOnly cookies in the first place?

A tool to convert MATLAB code to Python

There's also oct2py which can call .m files within python

https://pypi.python.org/pypi/oct2py

It requires GNU Octave, which is highly compatible with MATLAB.

https://www.gnu.org/software/octave/

Adding to an ArrayList Java

Array list can be implemented by the following code:

Arraylist<String> list = new ArrayList<String>();
list.add(value1);
list.add(value2);
list.add(value3);
list.add(value4);

Convert int to char in java

int a = 1;
char b = (char) a;
System.out.println(b);

will print out the char with Unicode code point 1 (start-of-heading char, which isn't printable; see this table: C0 Controls and Basic Latin, same as ASCII)

int a = '1';
char b = (char) a;
System.out.println(b);

will print out the char with Unicode code point 49 (one corresponding to '1')

If you want to convert a digit (0-9), you can add 48 to it and cast, or something like Character.forDigit(a, 10);.

If you want to convert an int seen as a Unicode code point, you can use Character.toChars(48) for example.

How to use QTimer

mytimer.h:

    #ifndef MYTIMER_H
    #define MYTIMER_H

    #include <QTimer>

    class MyTimer : public QObject
    {
        Q_OBJECT
    public:
        MyTimer();
        QTimer *timer;

    public slots:
        void MyTimerSlot();
    };

    #endif // MYTIME

mytimer.cpp:

#include "mytimer.h"
#include <QDebug>

MyTimer::MyTimer()
{
    // create a timer
    timer = new QTimer(this);

    // setup signal and slot
    connect(timer, SIGNAL(timeout()),
          this, SLOT(MyTimerSlot()));

    // msec
    timer->start(1000);
}

void MyTimer::MyTimerSlot()
{
    qDebug() << "Timer...";
}

main.cpp:

#include <QCoreApplication>
#include "mytimer.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    // Create MyTimer instance
    // QTimer object will be created in the MyTimer constructor
    MyTimer timer;

    return a.exec();
}

If we run the code:

Timer...
Timer...
Timer...
Timer...
Timer...
...

resources

Pass a simple string from controller to a view MVC3

To pass a string to the view as the Model, you can do:

public ActionResult Index()
{
    string myString = "This is my string";
    return View((object)myString);
}

You must cast it to an object so that MVC doesn't try to load the string as the view name, but instead pass it as the model. You could also write:

return View("Index", myString);

.. which is a bit more verbose.

Then in your view, just type it as a string:

@model string

<p>Value: @Model</p>

Then you can manipulate Model how you want.

For accessing it from a Layout page, it might be better to create an HtmlExtension for this:

public static string GetThemePath(this HtmlHelper helper)
{
    return "/path-to-theme";
}

Then inside your layout page:

<p>Value: @Html.GetThemePath()</p>

Hopefully you can apply this to your own scenario.

Edit: explicit HtmlHelper code:

namespace <root app namespace>
{
    public static class Helpers
    {
        public static string GetThemePath(this HtmlHelper helper)
        {
            return System.Web.Hosting.HostingEnvironment.MapPath("~") + "/path-to-theme";
        }
    }
}

Then in your view:

@{
    var path = Html.GetThemePath();
    // .. do stuff
}

Or: <p>Path: @Html.GetThemePath()</p>

Edit 2:

As discussed, the Helper will work if you add a @using statement to the top of your view, with the namespace pointing to the one that your helper is in.

Android: How to change the ActionBar "Home" Icon to be something other than the app icon?

The ActionBar will use the android:logo attribute of your manifest, if one is provided. That lets you use separate drawable resources for the icon (Launcher) and the logo (ActionBar, among other things).

How exactly does the python any() function work?

Simply saying, any() does this work : according to the condition even if it encounters one fulfilling value in the list, it returns true, else it returns false.

list = [2,-3,-4,5,6]

a = any(x>0 for x in lst)

print a:
True


list = [2,3,4,5,6,7]

a = any(x<0 for x in lst)

print a:
False

How to center horizontally div inside parent div

I am assuming the parent div has no width or a wide width, and the child div has a smaller width. The following will set the margin for the top and bottom to zero, and the sides to automatically fit. This centers the div.

div#child {
    margin: 0 auto;
}

Getting the parent div of element

var parentDiv = pDoc.parentElement

edit: this is sometimes parentNode in some cases.

https://developer.mozilla.org/en-US/docs/Web/API/Node/parentElement

How do I convert special UTF-8 chars to their iso-8859-1 equivalent using javascript?

Since the question on how to convert from ISO-8859-1 to UTF-8 is closed because of this one I'm going to post my solution here.

The problem is when you try to GET anything by using XMLHttpRequest, if the XMLHttpRequest.responseType is "text" or empty, the XMLHttpRequest.response is transformed to a DOMString and that's were things break up. After, it's almost impossible to reliably work with that string.

Now, if the content from the server is ISO-8859-1 you'll have to force the response to be of type "Blob" and later convert this to DOMSTring. For example:

var ajax = new XMLHttpRequest();
ajax.open('GET', url, true);
ajax.responseType = 'blob';
ajax.onreadystatechange = function(){
    ...
    if(ajax.responseType === 'blob'){
        // Convert the blob to a string
        var reader = new window.FileReader();
        reader.addEventListener('loadend', function() {
           // For ISO-8859-1 there's no further conversion required
           Promise.resolve(reader.result);
        });
        reader.readAsBinaryString(ajax.response);
    }
}

Seems like the magic is happening on readAsBinaryString so maybe someone can shed some light on why this works.

Wordpress - Images not showing up in the Media Library

check .htaccess file in root of wordpress, maybe there is a rule for /uploads directory. if so, remove it. but be careful and check which plugin did it, so disable the plugin, first.

How to pass data to all views in Laravel 5?

Laravel 5.6 method: https://laravel.com/docs/5.6/views#passing-data-to-views

Example, with sharing a model collection to all views (AppServiceProvider.php):

use Illuminate\Support\Facades\View;
use App\Product;

public function boot()
{
    $products = Product::all();
    View::share('products', $products);

}

How do I log errors and warnings into a file?

Take a look at the log_errors configuration option in php.ini. It seems to do just what you want to. I think you can use the error_log option to set your own logging file too.

When the log_errors directive is set to On, any errors reported by PHP would be logged to the server log or the file specified with error_log. You can set these options with ini_set too, if you need to.

(Please note that display_errors should be disabled in php.ini if this option is enabled)

db.collection is not a function when using MongoClient v3.0

Piggy backing on @MikkaS answer for Mongo Client v3.x, I just needed the async / await format, which looks slightly modified as this:

const myFunc = async () => {

     // Prepping here...


    // Connect
    let client = await MongoClient.connect('mongodb://localhost');
    let db = await client.db();

    // Run the query
    let cursor = await db.collection('customers').find({});

    // Do whatever you want on the result.
}

How to make a div center align in HTML

how about something along these lines

<style type="text/css">
  #container {
    margin: 0 auto;
    text-align: center; /* for IE */
  }

  #yourdiv {
    width: 400px;
    border: 1px solid #000;
  }
</style>

....

<div id="container">
  <div id="yourdiv">
    weee
  </div>
</div>

Regex Match all characters between two strings

I landed here on my search for regex to convert this print syntax between print "string", in Python2 in old scripts with: print("string"), for Python3. Works well, otherwise use 2to3.py for additional conversions. Here is my solution for others:

Try it out on Regexr.com (doesn't work in NP++ for some reason):

find:     (?<=print)( ')(.*)(')
replace: ('$2')

for variables:

(?<=print)( )(.*)(\n)
('$2')\n

for label and variable:

(?<=print)( ')(.*)(',)(.*)(\n)
('$2',$4)\n

How to replace all print "string" in Python2 with print("string") for Python3?

WebDriver - wait for element using Java

You can use Explicit wait or Fluent Wait

Example of Explicit Wait -

WebDriverWait wait = new WebDriverWait(WebDriverRefrence,20);
WebElement aboutMe;
aboutMe= wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("about_me")));

Example of Fluent Wait -

Wait<WebDriver> wait = new FluentWait<WebDriver>(driver)                            
.withTimeout(20, TimeUnit.SECONDS)          
.pollingEvery(5, TimeUnit.SECONDS)          
.ignoring(NoSuchElementException.class);    

  WebElement aboutMe= wait.until(new Function<WebDriver, WebElement>() {       
public WebElement apply(WebDriver driver) { 
return driver.findElement(By.id("about_me"));     
 }  
});

Check this TUTORIAL for more details.

'this' vs $scope in AngularJS controllers

I recommend you to read the following post: AngularJS: "Controller as" or "$scope"?

It describes very well the advantages of using "Controller as" to expose variables over "$scope".

I know you asked specifically about methods and not variables, but I think that it's better to stick to one technique and be consistent with it.

So for my opinion, because of the variables issue discussed in the post, it's better to just use the "Controller as" technique and also apply it to the methods.

Which is the best Linux C/C++ debugger (or front-end to gdb) to help teaching programming?

Perhaps it is indirect to gdb (because it's an IDE), but my recommendations would be KDevelop. Being quite spoiled with Visual Studio's debugger (professionally at work for many years), I've so far felt the most comfortable debugging in KDevelop (as hobby at home, because I could not afford Visual Studio for personal use - until Express Edition came out). It does "look something similar to" Visual Studio compared to other IDE's I've experimented with (including Eclipse CDT) when it comes to debugging step-through, step-in, etc (placing break points is a bit awkward because I don't like to use mouse too much when coding, but it's not difficult).

Font size relative to the user's screen resolution?

I've created a variant of https://stackoverflow.com/a/17845473/189411

where you can set min and max text size in relation of min and max size of box that you want "check" size. In addition you can check size of dom element different than box where you want apply text size.

You resize text between 19px and 25px on #size-2 element, based on 500px and 960px width of #size-2 element

resizeTextInRange(500,960,19,25,'#size-2');

You resize text between 13px and 20px on #size-1 element, based on 500px and 960px width of body element

resizeTextInRange(500,960,13,20,'#size-1','body');

complete code are there https://github.com/kiuz/sandbox-html-js-css/tree/gh-pages/text-resize-in-range-of-text-and-screen/src

function inRange (x,min,max) {
    return Math.min(Math.max(x, min), max);
}

function resizeTextInRange(minW,maxW,textMinS,textMaxS, elementApply, elementCheck=0) {

    if(elementCheck==0){elementCheck=elementApply;}

    var ww = $(elementCheck).width();
    var difW = maxW-minW;
    var difT = textMaxS- textMinS;
    var rapW = (ww-minW);
    var out=(difT/100)*(rapW/(difW/100))+textMinS;
    var normalizedOut = inRange(out, textMinS, textMaxS);
    $(elementApply).css('font-size',normalizedOut+'px');

    console.log(normalizedOut);

}

$(function () {
    resizeTextInRange(500,960,19,25,'#size-2');
    resizeTextInRange(500,960,13,20,'#size-1','body');
    $(window).resize(function () {
        resizeTextInRange(500,960,19,25,'#size-2');
        resizeTextInRange(500,960,13,20,'#size-1','body');
    });
});

How do I start my app on startup?

The Sean's solution didn't work for me initially (Android 4.2.2). I had to add a dummy activity to the same Android project and run the activity manually on the device at least once. Then the Sean's solution started to work and the BroadcastReceiver was notified after subsequent reboots.

Redeploy alternatives to JRebel

Take a look at DCEVM, it's a modification of the HotSpot VM that allows unlimited class redefinitions at runtime. You can add/remove fields and methods and change the super types of a class at runtime.

The binaries available on the original site are limited to Java 6u25 and to early versions of Java 7. The project has been forked on Github and supports recent versions of Java 7 and 8. The maintainer provides binaries for 32/64 bits VMs on Windows/Linux. Starting with Java 11 the project moved to a new GitHub repository and now also provides binaries for OS X.

DCEVM is packaged for Debian and Ubuntu, it's conveniently integrated with OpenJDK and can be invoked with java -dcevm. The name of the package depends on the version of the default JDK:

Debian 7&8 and Ubuntu 15.04 : openjdk-7-jre-dcevm
Debian 9 and Ubuntu 16.04 : openjdk-8-jre-dcevm
Debian 10 and Ubuntu 19.04 : openjdk-11-jre-dcevm

how to break the _.each function in underscore.js

You can have a look to _.some instead of _.each. _.some stops traversing the list once a predicate is true. Result(s) can be stored in an external variable.

_.some([1, 2, 3], function(v) {
    if (v == 2) return true;
})

See http://underscorejs.org/#some

Directory.GetFiles of certain extension

If you would like to do your filtering in LINQ, you can do it like this:

var ext = new List<string> { "jpg", "gif", "png" };
var myFiles = Directory
    .EnumerateFiles(dir, "*.*", SearchOption.AllDirectories)
    .Where(s => ext.Contains(Path.GetExtension(s).TrimStart(".").ToLowerInvariant()));

Now ext contains a list of allowed extensions; you can add or remove items from it as necessary for flexible filtering.

C# difference between == and Equals()

When we create any object there are two parts to the object one is the content and the other is reference to that content. == compares both content and reference; equals() compares only content

http://www.codeproject.com/Articles/584128/What-is-the-difference-between-equalsequals-and-Eq

Is there a way I can retrieve sa password in sql server 2005

MSSQL have its own database management tool called as "MSSQL Server Management Studio (SSMS)". Here are steps to reset SA password using SSMS :

1] Open SSMS management console, it will prompt for authentication details,

Select Server Type : "Database Engine", Server name : IP / hostname of your MSSQL server Authentication : Windows Authentication

Once you select Authentication type as "Windows Authentication", the user name and password fields will be grayed out and it will allow you to login SQL server without entering login details. Windows Authentication is possible only when you are logged on same server in RDP on which SQL service is present.

2] once you are in, under "Object Explorer" expand Security and then Logins 3] locate and right click on user SA and select Properties 4] under General section enter desired password in front of "Password:" and "Confirm Password:" 5] hit OK at bottom.

This is the easiest and secure way to reset SA password instead of using any third party non secure tools

Using JQuery to open a popup window and print

Got it! I found an idea here

http://www.mail-archive.com/[email protected]/msg18410.html

In this example, they loaded a blank popup window into an object, cloned the contents of the element to be displayed, and appended it to the body of the object. Since I already knew what the contents of view-details (or any page I load in the lightbox), I just had to clone that content instead and load it into an object. Then, I just needed to print that object. The final outcome looks like this:

$('.printBtn').bind('click',function() {
    var thePopup = window.open( '', "Customer Listing", "menubar=0,location=0,height=700,width=700" );
    $('#popup-content').clone().appendTo( thePopup.document.body );
    thePopup.print();
});

I had one small drawback in that the style sheet I was using in view-details.php was using a relative link. I had to change it to an absolute link. The reason being that the window didn't have a URL associated with it, so it had no relative position to draw on.

Works in Firefox. I need to test it in some other major browsers too.

I don't know how well this solution works when you're dealing with images, videos, or other process intensive solutions. Although, it works pretty well in my case, since I'm just loading tables and text values.

Thanks for the input! You gave me some ideas of how to get around this.

Download a file by jQuery.Ajax

Use window.open https://developer.mozilla.org/en-US/docs/Web/API/Window/open

For example, you can put this line of code in a click handler:

window.open('/file.txt', '_blank');

It will open a new tab (because of the '_blank' window-name) and that tab will open the URL.

Your server-side code should also have something like this:

res.set('Content-Disposition', 'attachment; filename=file.txt');

And that way, the browser should prompt the user to save the file to disk, instead of just showing them the file. It will also automatically close the tab that it just opened.

Python Flask, how to set content type

Use the make_response method to get a response with your data. Then set the mimetype attribute. Finally return this response:

@app.route('/ajax_ddl')
def ajax_ddl():
    xml = 'foo'
    resp = app.make_response(xml)
    resp.mimetype = "text/xml"
    return resp

If you use Response directly, you lose the chance to customize the responses by setting app.response_class. The make_response method uses the app.responses_class to make the response object. In this you can create your own class, add make your application uses it globally:

class MyResponse(app.response_class):
    def __init__(self, *args, **kwargs):
        super(MyResponse, self).__init__(*args, **kwargs)
        self.set_cookie("last-visit", time.ctime())

app.response_class = MyResponse

The target ... overrides the `OTHER_LDFLAGS` build setting defined in `Pods/Pods.xcconfig

I've seen these 3 errors for pod command in terminal

pod install

[!] The MY_APP [Debug/Release] target overrides the HEADER_SEARCH_PATHS ...
[!] The MY_APP [Debug/Release] target overrides the OTHER_LDFLAGS ...
[!] The MY_APP [Debug/Release] target overrides the GCC_PREPROCESSOR_DEFINITIONS ...

All these 3 errors would be gone by adding $(inherited) to

Header Search Paths
Other Linker Flags
Preprocessor Macros

in Project -> Target -> Build Settings

And now the command would run without giving any errors

pod install

How do you find what version of libstdc++ library is installed on your linux machine?

What exactly do you want to know?

The shared library soname? That's part of the filename, libstdc++.so.6, or shown by readelf -d /usr/lib64/libstdc++.so.6 | grep soname.

The minor revision number? You should be able to get that by simply checking what the symlink points to:

$ ls -l  /usr/lib/libstdc++.so.6
lrwxrwxrwx. 1 root root 19 Mar 23 09:43 /usr/lib/libstdc++.so.6 -> libstdc++.so.6.0.16

That tells you it's 6.0.16, which is the 16th revision of the libstdc++.so.6 version, which corresponds to the GLIBCXX_3.4.16 symbol versions.

Or do you mean the release it comes from? It's part of GCC so it's the same version as GCC, so unless you've screwed up your system by installing unmatched versions of g++ and libstdc++.so you can get that from:

$ g++ -dumpversion
4.6.3

Or, on most distros, you can just ask the package manager. On my Fedora host that's

$ rpm -q libstdc++
libstdc++-4.6.3-2.fc16.x86_64
libstdc++-4.6.3-2.fc16.i686

As other answers have said, you can map releases to library versions by checking the ABI docs

How do I check if the Java JDK is installed on Mac?

If you are on Mac OS Big Sur, then you probably have a messed up java installation. I found info on how to fix the issue with this article: https://knasmueller.net/how-to-install-java-openjdk-15-on-macos-big-sur

Download the .tar.gz file of the JDK on https://jdk.java.net/15/
Navigate to the download folder, and run these commands (move the .tar.gz file, extract it and remove it after extraction):

sudo mv openjdk-15.0.2_osx-x64_bin.tar.gz /Library/Java/JavaVirtualMachines/
cd /Library/Java/JavaVirtualMachines/
sudo tar -xzf openjdk-15.0.2_osx-x64_bin.tar.gz
sudo rm openjdk-15.0.2_osx-x64_bin.tar.gz

Note: it might be 15.0.3 or higher, depending on the date of your download.

run /usr/libexec/java_home -v15 and copy the output
add this line to your .bash_profile or .zshrc file, depending on which shell you are using. You will probably have only one of these files existing in your home directory (~/.bash_profile or ~/.zshrc).

JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk-15.0.2.jdk/Contents/Home

save the changes and make them effective right away by running: source ~/.bash_profile or source ~/.zshrc
check that java is working - run java -v

R programming: How do I get Euler's number?

SQL statement to get column type

In vb60 you can do this:

Public Cn As ADODB.Connection
'open connection
Dim Rs As ADODB.Recordset
 Set Rs = Cn.OpenSchema(adSchemaColumns, Array(Empty, Empty, UCase("Table"), UCase("field")))

'and sample (valRs is my function for rs.fields("CHARACTER_MAXIMUM_LENGTH").value):

 RT_Charactar_Maximum_Length = (ValRS(Rs, "CHARACTER_MAXIMUM_LENGTH"))
        rt_Tipo = (ValRS(Rs, "DATA_TYPE"))

SqlBulkCopy - The given value of type String from the data source cannot be converted to type money of the specified target column

Not going to be everyone's fix, but it was for me:

So, i ran across this exact issue. The problem I seemed to have was when my DataTable didnt have an ID column, but the target destination had one with a primary key.

When i adapted my DataTable to have an id, the copy worked perfectly.

In my scenario, the Id column isnt very important to have the primary key so i deleted this column from the target destination table and the SqlBulkCopy is working without issue.

How to create a shared library with cmake?

Always specify the minimum required version of cmake

cmake_minimum_required(VERSION 3.9)

You should declare a project. cmake says it is mandatory and it will define convenient variables PROJECT_NAME, PROJECT_VERSION and PROJECT_DESCRIPTION (this latter variable necessitate cmake 3.9):

project(mylib VERSION 1.0.1 DESCRIPTION "mylib description")

Declare a new library target. Please avoid the use of file(GLOB ...). This feature does not provide attended mastery of the compilation process. If you are lazy, copy-paste output of ls -1 sources/*.cpp :

add_library(mylib SHARED
    sources/animation.cpp
    sources/buffers.cpp
    [...]
)

Set VERSION property (optional but it is a good practice):

set_target_properties(mylib PROPERTIES VERSION ${PROJECT_VERSION})

You can also set SOVERSION to a major number of VERSION. So libmylib.so.1 will be a symlink to libmylib.so.1.0.0.

set_target_properties(mylib PROPERTIES SOVERSION 1)

Declare public API of your library. This API will be installed for the third-party application. It is a good practice to isolate it in your project tree (like placing it include/ directory). Notice that, private headers should not be installed and I strongly suggest to place them with the source files.

set_target_properties(mylib PROPERTIES PUBLIC_HEADER include/mylib.h)

If you work with subdirectories, it is not very convenient to include relative paths like "../include/mylib.h". So, pass a top directory in included directories:

target_include_directories(mylib PRIVATE .)

target_include_directories(mylib PRIVATE include)
target_include_directories(mylib PRIVATE src)

Create an install rule for your library. I suggest to use variables CMAKE_INSTALL_*DIR defined in GNUInstallDirs:

include(GNUInstallDirs)

And declare files to install:

install(TARGETS mylib
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
    PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})

You may also export a pkg-config file. This file allows a third-party application to easily import your library:

with Makefile, see pkg-config
with Autotools, see PKG_CHECK_MODULES
with cmake, see pkg_check_modules

Create a template file named mylib.pc.in (see pc(5) manpage for more information):

prefix=@CMAKE_INSTALL_PREFIX@
exec_prefix=@CMAKE_INSTALL_PREFIX@
libdir=${exec_prefix}/@CMAKE_INSTALL_LIBDIR@
includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@

Name: @PROJECT_NAME@
Description: @PROJECT_DESCRIPTION@
Version: @PROJECT_VERSION@

Requires:
Libs: -L${libdir} -lmylib
Cflags: -I${includedir}

In your CMakeLists.txt, add a rule to expand @ macros (@ONLY ask to cmake to not expand variables of the form ${VAR}):

configure_file(mylib.pc.in mylib.pc @ONLY)

And finally, install generated file:

install(FILES ${CMAKE_BINARY_DIR}/mylib.pc DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/pkgconfig)

You may also use cmake EXPORT feature. However, this feature is only compatible with cmake and I find it difficult to use.

Finally the entire CMakeLists.txt should looks like:

cmake_minimum_required(VERSION 3.9)
project(mylib VERSION 1.0.1 DESCRIPTION "mylib description")
include(GNUInstallDirs)
add_library(mylib SHARED src/mylib.c)
set_target_properties(mylib PROPERTIES
    VERSION ${PROJECT_VERSION}
    SOVERSION 1
    PUBLIC_HEADER api/mylib.h)
configure_file(mylib.pc.in mylib.pc @ONLY)
target_include_directories(mylib PRIVATE .)
install(TARGETS mylib
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
    PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
install(FILES ${CMAKE_BINARY_DIR}/mylib.pc
    DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/pkgconfig)

How do you delete all text above a certain line

:1,.d deletes lines 1 to current.
:1,.-1d deletes lines 1 to above current.

(Personally I'd use dgg or kdgg like the other answers, but TMTOWTDI.)

jump to line X in nano editor

I am using Linux raspi 4.19.118+ #1311 via ssh Powershell on Win 10 Pro 1909 with German keyboard. nano shortcut Goto Line with "Crtl + Shift + -" was not working Solution: Step 1 - Do Current Position with "Crtl + C" Step 2 - Goto Line with "Crtl + Shift + -" IS working!

I dont know what effects it. But now its working without step 1!

How to align matching values in two columns in Excel, and bring along associated values in other columns

Skip all of this. Download Microsoft FUZZY LOOKUP add in. Create tables using your columns. Create a new worksheet. INPUT tables into the tool. Click all corresponding columns check boxes. Use slider for exact matches. HIT go and wait for the magic.

How to show loading spinner in jQuery?

You can always use Block UI jQuery plugin which does everything for you, and it even blocks the page of any input while the ajax is loading. In case that the plugin seems to not been working, you can read about the right way to use it in this answer. Check it out.

OS X cp command in Terminal - No such file or directory

In my case, I had accidentally named a folder 'samples '. I couldn't see the space when I did 'ls -la'.

Eventually I realized this when I tried tabbing to autocomplete and saw 'samples\ /'.

To fix this I ran

mv samples\  samples

Error:Conflict with dependency 'com.google.code.findbugs:jsr305'

The accepted answer is one way of fixing the issue, because it will just apply some strategy for the problematic dependency (com.google.code.findbugs:jsr305) and it will resolve the problem around the project, using some version of this dependency. Basically it will align the versions of this library inside the whole project.
There is an answer from @Santhosh (and couple of other people) who suggests to exclude the same dependency for espresso, which should work by the same way, but if the project has some other dependencies who depend on the same library (com.google.code.findbugs:jsr305), again we will have the same issue. So in order to use this approach you will need to exclude the same group from all project dependencies, who depend on com.google.code.findbugs:jsr305. I personally found that Espresso Contrib and Espresso Intents also use com.google.code.findbugs:jsr305.

I hope this thoughts will help somebody to realise what exactly is happening here and how things work (not just copy paste some code) :).

how to split the ng-repeat data with three columns using bootstrap

The most reliable and technically correct approach is to transform the data in the controller. Here's a simple chunk function and usage.

function chunk(arr, size) {
  var newArr = [];
  for (var i=0; i<arr.length; i+=size) {
    newArr.push(arr.slice(i, i+size));
  }
  return newArr;
}

$scope.chunkedData = chunk(myData, 3);

Then your view would look like this:

<div class="row" ng-repeat="rows in chunkedData">
  <div class="span4" ng-repeat="item in rows">{{item}}</div>
</div>

If you have any inputs within the ng-repeat, you will probably want to unchunk/rejoin the arrays as the data is modified or on submission. Here's how this would look in a $watch, so that the data is always available in the original, merged format:

$scope.$watch('chunkedData', function(val) {
  $scope.data = [].concat.apply([], val);
}, true); // deep watch

Many people prefer to accomplish this in the view with a filter. This is possible, but should only be used for display purposes! If you add inputs within this filtered view, it will cause problems that can be solved, but are not pretty or reliable.

The problem with this filter is that it returns new nested arrays each time. Angular is watching the return value from the filter. The first time the filter runs, Angular knows the value, then runs it again to ensure it is done changing. If both values are the same, the cycle is ended. If not, the filter will fire again and again until they are the same, or Angular realizes an infinite digest loop is occurring and shuts down. Because new nested arrays/objects were not previously tracked by Angular, it always sees the return value as different from the previous. To fix these "unstable" filters, you must wrap the filter in a memoize function. lodash has a memoize function and the latest version of lodash also includes a chunk function, so we can create this filter very simply using npm modules and compiling the script with browserify or webpack.

Remember: display only! Filter in the controller if you're using inputs!

Install lodash:

npm install lodash-node

Create the filter:

var chunk = require('lodash-node/modern/array/chunk');
var memoize = require('lodash-node/modern/function/memoize');

angular.module('myModule', [])
.filter('chunk', function() {
  return memoize(chunk);
});

And here's a sample with this filter:

<div ng-repeat="row in ['a','b','c','d','e','f'] | chunk:3">
  <div class="column" ng-repeat="item in row">
    {{($parent.$index*row.length)+$index+1}}. {{item}}
  </div>
</div>

Order items vertically

1  4
2  5
3  6

Regarding vertical columns (list top to bottom) rather than horizontal (left to right), the exact implementation depends on the desired semantics. Lists that divide up unevenly can be distributed different ways. Here's one way:

<div ng-repeat="row in columns">
  <div class="column" ng-repeat="item in row">
    {{item}}
  </div>
</div>

var data = ['a','b','c','d','e','f','g'];
$scope.columns = columnize(data, 3);
function columnize(input, cols) {
  var arr = [];
  for(i = 0; i < input.length; i++) {
    var colIdx = i % cols;
    arr[colIdx] = arr[colIdx] || [];
    arr[colIdx].push(input[i]);
  }
  return arr;
}

However, the most direct and just plainly simple way to get columns is to use CSS columns:

.columns {
  columns: 3;
}

<div class="columns">
  <div ng-repeat="item in ['a','b','c','d','e','f','g']">
    {{item}}
  </div>
</div>

What is the difference between _tmain() and main() in C++?

Ok, the question seems to have been answered fairly well, the UNICODE overload should take a wide character array as its second parameter. So if the command line parameter is "Hello" that would probably end up as "H\0e\0l\0l\0o\0\0\0" and your program would only print the 'H' before it sees what it thinks is a null terminator.

So now you may wonder why it even compiles and links.

Well it compiles because you are allowed to define an overload to a function.

Linking is a slightly more complex issue. In C, there is no decorated symbol information so it just finds a function called main. The argc and argv are probably always there as call-stack parameters just in case even if your function is defined with that signature, even if your function happens to ignore them.

Even though C++ does have decorated symbols, it almost certainly uses C-linkage for main, rather than a clever linker that looks for each one in turn. So it found your wmain and put the parameters onto the call-stack in case it is the int wmain(int, wchar_t*[]) version.

Android Studio gradle takes too long to build

I had issues like this especially when debugging actively through my phone; at times it took 27 minutes. I did the following things and take note of the explanation under each - one may work for you:

Changed my gradle.properties file (under Gradle scripts if you have the project file view under Android option OR inside your project folder). I added this because my computer has some memory to spare - you can assign different values at the end depending on your computer specifications and android studio minimum requirements (Xmx8000m -XX:MaxPermSize=5000m) :

org.gradle.daemon=true

org.gradle.configureondemand=true

org.gradle.parallel=true

android.enableBuildCache=true

org.gradle.caching=true

org.gradle.jvmargs=-Xmx8000m -XX:MaxPermSize=5000m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8

This did not completely solve my issue in my case. Therefore I also did as others had suggested before - to make my builds process offline:

File -> Settings/Preferences -> Build, Execution, Deployment -> Gradle

Global Gradle Settings (at the bottom)

Mark the checkbox named: Offline Work.

This reduced time substantially but it was erratic; at times took longer. Therefore I made some changes on Instant Run:

File -> Settings/Preferences -> Build, Execution, Deployment -> Instant Run

Checked : Enable Instant Run to hot swap code...

Checked: restart activity on code changes ...

The move above was erratic also and therefore I sought to find out if the problem may be the processes/memory that ran directly on either my phone and computer. Here I freed up a little memory space in my phone and storage (which was at 98% utilized - down to 70%) and also on task manager (Windows), increased the priority of both Android Studio and Java.exe to High. Take this step cautiously; depends on your computer's memory.
After all this my build time while debugging actively on my phone at times went down to 1 ~ 2 minutes but at times spiked. I decided to do a hack which surprised me by taking it down to seconds best yet on the same project that gave me 22 - 27 minutes was 12 seconds!:

Connect phone for debugging then click RUN

After it starts, unplug the phone - the build should continue faster and raise an error at the end indicating this : Session 'app': Error Installing APKs

Reconnect back the phone and click on RUN again...

ALTERNATIVELY

If the script/function/method I'm debugging is purely JAVA, not JAVA-android e.g. testing an API with JSONArrays/JSONObjects, I test my java functions/methods on Netbeans which can compile a single file and show the output faster then make necessary changes on my Android Studio files. This also saves me a lot of time.

EDIT

I tried creating a new android project in local storage and copied all my files from the previous project into the new one - java, res, manifest, gradle app and gradle project (with latest gradle classpath dependency). And now I can build on my phone in less than 15 seconds.

Can you style html form buttons with css?

You might want to add:

-webkit-appearance: none;

if you need it looking consistent on Mobile Safari...

Facebook Architecture

Well Facebook has undergone MANY many changes and it wasn't originally designed to be efficient. It was designed to do it's job. I have absolutely no idea what the code looks like and you probably won't find much info about it (for obvious security and copyright reasons), but just take a look at the API. Look at how often it changes and how much of it doesn't work properly, anymore, or at all.

I think the biggest ace up their sleeve is the Hiphop. http://developers.facebook.com/blog/post/358 You can use HipHop yourself: https://github.com/facebook/hiphop-php/wiki

But if you ask me it's a very ambitious and probably time wasting task. Hiphop only supports so much, it can't simply convert everything to C++. So what does this tell us? Well, it tells us that Facebook is NOT fully taking advantage of the PHP language. It's not using the latest 5.3 and I'm willing to bet there's still a lot that is PHP 4 compatible. Otherwise, they couldn't use HipHop. HipHop IS A GOOD IDEA and needs to grow and expand, but in it's current state it's not really useful for that many people who are building NEW PHP apps.

There's also PHP to JAVA via things like Resin/Quercus. Again, it doesn't support everything...

Another thing to note is that if you use any non-standard PHP module, you aren't going to be able to convert that code to C++ or Java either. However...Let's take a look at PHP modules. They are ARE compiled in C++. So if you can build PHP modules that do things (like parse XML, etc.) then you are basically (minus some interaction) working at the same speed. Of course you can't just make a PHP module for every possible need and your entire app because you would have to recompile and it would be much more difficult to code, etc.

However...There are some handy PHP modules that can help with speed concerns. Though at the end of the day, we have this awesome thing known as "the cloud" and with it, we can scale our applications (PHP included) so it doesn't matter as much anymore. Hardware is becoming cheaper and cheaper. Amazon just lowered it's prices (again) speaking of.

So as long as you code your PHP app around the idea that it will need to one day scale...Then I think you're fine and I'm not really sure I'd even look at Facebook and what they did because when they did it, it was a completely different world and now trying to hold up that infrastructure and maintain it...Well, you get things like HipHop.

Now how is HipHop going to help you? It won't. It can't. You're starting fresh, you can use PHP 5.3. I'd highly recommend looking into PHP 5.3 frameworks and all the new benefits that PHP 5.3 brings to the table along with the SPL libraries and also think about your database too. You're most likely serving up content from a database, so check out MongoDB and other types of databases that are schema-less and document-oriented. They are much much faster and better for the most "common" type of web site/app.

Look at NEW companies like Foursquare and Smugmug and some other companies that are utilizing NEW technology and HOW they are using it. For as successful as Facebook is, I honestly would not look at them for "how" to build an efficient web site/app. I'm not saying they don't have very (very) talented people that work there that are solving (their) problems creatively...I'm also not saying that Facebook isn't a great idea in general and that it's not successful and that you shouldn't get ideas from it....I'm just saying that if you could view their entire source code, you probably wouldn't benefit from it.

Can Windows' built-in ZIP compression be scripted?

Yes, this can be scripted with VBScript. For example the following code can create a zip from a directory:

Dim fso, winShell, MyTarget, MySource, file
Set fso = CreateObject("Scripting.FileSystemObject")
Set winShell = createObject("shell.application")


MyTarget = Wscript.Arguments.Item(0)
MySource = Wscript.Arguments.Item(1)

Wscript.Echo "Adding " & MySource & " to " & MyTarget

'create a new clean zip archive
Set file = fso.CreateTextFile(MyTarget, True)
file.write("PK" & chr(5) & chr(6) & string(18,chr(0)))
file.close

winShell.NameSpace(MyTarget).CopyHere winShell.NameSpace(MySource).Items

do until winShell.namespace(MyTarget).items.count = winShell.namespace(MySource).items.count
    wscript.sleep 1000 
loop

Set winShell = Nothing
Set fso = Nothing

You may also find http://www.naterice.com/blog/template_permalink.asp?id=64 helpful as it includes a full Unzip/Zip implementation in VBScript.

If you do a size check every 500 ms rather than a item count it works better for large files. Win 7 writes the file instantly although it's not finished compressing:

set fso=createobject("scripting.filesystemobject")
Set h=fso.getFile(DestZip)
do
    wscript.sleep 500
    max = h.size
loop while h.size > max

Works great for huge amounts of log files.

Using 24 hour time in bootstrap timepicker

Use capitals letter for hours HH = 24 hour format an hh = 12 hour format

_x000D_

$('#fecha').datetimepicker({_x000D_
   format : 'DD/MM/YYYY HH:mm'_x000D_
});

_x000D_

How to add screenshot to READMEs in github repository?

Add ![ScreenShot](screenshot.png) in the readme markdown as mentioned by many above. Replace screenshot.png with the name of the image you uploaded in your repository.

But here is a newbie tip when you upload the image (as I made this mistake myself):

ensure that your image name does not contain spaces. My original image was saved as "Screenshot day month year id.png". If you don't change the name to something like contentofimage.png, it won't appear as an image in your readme file.

Best way to create unique token in Rails?

def generate_token
    self.token = Digest::SHA1.hexdigest("--#{ BCrypt::Engine.generate_salt }--")
end

Angular2 RC5: Can't bind to 'Property X' since it isn't a known property of 'Child Component'

I fixed it with adding the prefix (attr.) :

<create-report-card-form [attr.currentReportCardCount]="expression" ...

Unfortunately this haven't documented properly yet.

more detail here

How to include !important in jquery

var tabsHeight = 650;

$("tabs").attr('style', 'height: '+ tabsHeight +'px !important');

#CSS
.myclass{height:650px !important;}

then

$("tabs").addClass("myclass");

Check list of words in another string

If your list of words is of substantial length, and you need to do this test many times, it may be worth converting the list to a set and using set intersection to test (with the added benefit that you wil get the actual words that are in both lists):

>>> long_word_list = 'some one long two phrase three about above along after against'
>>> long_word_set = set(long_word_list.split())
>>> set('word along river'.split()) & long_word_set
set(['along'])

How to convert password into md5 in jquery?

Get the field value through the id and send with ajax

var field = $("#field").val();
$.ajax({
    type: "POST",
    url: "db.php",
    data: {variable_name:field},
    async:false,
    dataType:"json",
    success: function(response) {
       alert(response);
    }
 });

At db.php file get the variable name

$variable_name = $_GET['variable_name'];
mysql_query("SELECT password FROM table_name WHERE password='".md5($variable_name)."'");

What is the most efficient way to get first and last line of a text file?

Here is an extension of @Trasp's answer that has additional logic for handling the corner case of a file that has only one line. It may be useful to handle this case if you repeatedly want to read the last line of a file that is continuously being updated. Without this, if you try to grab the last line of a file that has just been created and has only one line, IOError: [Errno 22] Invalid argument will be raised.

def tail(filepath):
    with open(filepath, "rb") as f:
        first = f.readline()      # Read the first line.
        f.seek(-2, 2)             # Jump to the second last byte.
        while f.read(1) != b"\n": # Until EOL is found...
            try:
                f.seek(-2, 1)     # ...jump back the read byte plus one more.
            except IOError:
                f.seek(-1, 1)
                if f.tell() == 0:
                    break
        last = f.readline()       # Read last line.
    return last

How do I keep Python print from adding newlines or spaces?

In Python 3, use

print('h', end='')

to suppress the endline terminator, and

print('a', 'b', 'c', sep='')

to suppress the whitespace separator between items. See the documentation for print

nodejs vs node on ubuntu 12.04

Adding to @randunel's correct answer (can't yet comment on SO):

I also had to symlink /usr/local/bin/node to /usr/bin/nodejs as well.

sudo ln -s /usr/bin/nodejs /usr/local/bin/node

Apparently, this was overriding the /usr/bin/ node command.

No idea how that got set, but hope it helps someone else as it was a pain to figure out why the above wasn't working for me.

Getting values from JSON using Python

There's a Py library that has a module that facilitates access to Json-like dictionary key-values as attributes: https://github.com/asuiu/pyxtension You can use it as:

j = Json('{"lat":444, "lon":555}')
j.lat + ' ' + j.lon

How To Run PHP From Windows Command Line in WAMPServer

In windows, put your php.exe file in windows/system32 or any other system executable folders and then go to command line and type php and hit enter following it, if it doesnt generate any error then you are ready to use PHP on command line. If you have set your php.exe somewhere else than default system folders then you need to set the path of it in the environment variables! You can get there in following path....

control panel -> System -> Edith the environment variables of your account -> Environment Vaiables -> path -> edit then set the absolute path of your php.exe there and follow the same procedure as in first paragraph, if nothing in the error department, then you are ready to use php from command line!

I don't understand -Wl,-rpath -Wl,

The -Wl,xxx option for gcc passes a comma-separated list of tokens as a space-separated list of arguments to the linker. So

gcc -Wl,aaa,bbb,ccc

eventually becomes a linker call

ld aaa bbb ccc

In your case, you want to say "ld -rpath .", so you pass this to gcc as -Wl,-rpath,. Alternatively, you can specify repeat instances of -Wl:

gcc -Wl,aaa -Wl,bbb -Wl,ccc

Note that there is no comma between aaa and the second -Wl.

Or, in your case, -Wl,-rpath -Wl,..

"Cannot evaluate expression because the code of the current method is optimized" in Visual Studio 2010

When you see the "Cannot evaluate expression because the code of the current method is optimized." message after issuing a Debugger.Break() statement then please make sure you press F10 to step to the next statement.

Once stepped to the next statement, and assuming you are running a Debug build, this message should disappear.

Should I use alias or alias_method?

I think there is an unwritten rule (something like a convention) that says to use 'alias' just for registering a method-name alias, means if you like to give the user of your code one method with more than one name:

class Engine
  def start
    #code goes here
  end
  alias run start
end

If you need to extend your code, use the ruby meta alternative.

class Engine
  def start
    puts "start me"
  end
end

Engine.new.start() # => start me

Engine.class_eval do
  unless method_defined?(:run)
    alias_method :run, :start
    define_method(:start) do
      puts "'before' extension"
      run()
      puts "'after' extension"
    end
  end
end

Engine.new.start
# => 'before' extension
# => start me
# => 'after' extension

Engine.new.run # => start me

What is considered a good response time for a dynamic, personalized web application?

We strive for response times of 20 milliseconds, while some complex pages take up to 100 milliseconds. For the most complex pages, we break the page down into smaller pieces, and use the progressive display pattern to load each section. This way, some portions load quickly, even if the page takes 1 to 2 seconds to load, keeping the user engaged while the rest of the page is loading.

Composer Update Laravel

You can use :

composer self-update --2

To update to 2.0.8 version (Latest stable version)

What exactly does the T and Z mean in timestamp?

The T doesn't really stand for anything. It is just the separator that the ISO 8601 combined date-time format requires. You can read it as an abbreviation for Time.

The Z stands for the Zero timezone, as it is offset by 0 from the Coordinated Universal Time (UTC).

Both characters are just static letters in the format, which is why they are not documented by the datetime.strftime() method. You could have used Q or M or Monty Python and the method would have returned them unchanged as well; the method only looks for patterns starting with % to replace those with information from the datetime object.

Subscript out of range error in this Excel VBA script

Private Sub CommandButton1_Click()

    Dim Data As Object, Employee As Object

    Application.ScreenUpdating = False

    Set Data = ThisWorkbook.Sheets("Data")

    Set Employee = ThisWorkbook.Sheets("Employee Names")

    Data.Range("AK1").Value = "Lookup"

    Data.Range("AK2:AK" & Data.Range("A1").End(xlDown).Row).Formula = "=VLOOKUP(E2,'Employee Names'!$A:$A,1,0)"

    Data.Range("AK2:AK" & Data.Range("A1").End(xlDown).Row).Value = Data.Range("AK2:AK" & Data.Range("A1").End(xlDown).Row).Value

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=5, Criteria1:="<>"

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=37, Criteria1:="#N/A"

    Application.DisplayAlerts = False

    Data.AutoFilter.Range.Offset(1, 0).Rows.SpecialCells(xlCellTypeVisible).Delete (xlShiftUp)

    Data.Range("AK:AK").Delete

    Data.AutoFilterMode = False

    'Selection.AutoFilter

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=7, Criteria1:="="

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=12, Criteria1:="<>"

    Worksheets("Data").Range("A1:AK" & Data.Range("A1").End(xlDown).Row).Copy

    Sheets.Add(After:=Sheets(Sheets.Count)).Name = "DrfeeRequested"

    Set Dr = ThisWorkbook.Worksheets("DrfeeRequested")

    Dr.Range("A1").PasteSpecial Paste:=xlPasteValues

    Application.CutCopyMode = False

    Data.AutoFilterMode = False

    'DrfeeRequested.AutoFilterMode = False

    Selection.AutoFilter

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=13, Criteria1:="<>"

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).Copy

    Sheets.Add(After:=Sheets(Sheets.Count)).Name = "RateLockfollowup"
    Set Ratefolup = ThisWorkbook.Worksheets("RateLockfollowup")

    Ratefolup.Range("A1").PasteSpecial Paste:=xlPasteValues

    Application.CutCopyMode = False

    Data.AutoFilterMode = False

    Selection.AutoFilter

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=19, Criteria1:="="

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=13, Criteria1:="<>"

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).Copy

    Sheets.Add(After:=Sheets(Sheets.Count)).Name = "Lockedlefollowup"
    Set Lockfolup = ThisWorkbook.Worksheets("Lockedlefollowup")

    Lockfolup.Range("A1").PasteSpecial Paste:=xlPasteValues

    Application.CutCopyMode = False

    Data.AutoFilterMode = False

    Selection.AutoFilter

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=19, Criteria1:="="

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).Copy

    Sheets.Add(After:=Sheets(Sheets.Count)).Name = "Hoifollowup"

    Set Hoifolup = ThisWorkbook.Worksheets("Hoifollowup")

    Hoifolup.Range("A1").PasteSpecial Paste:=xlPasteValues

    Application.CutCopyMode = False

    Data.AutoFilterMode = False

    Selection.AutoFilter

    TodayDT = Format(Now())

    Weekdy = Weekday(Now())

    If Weekdy = 2 Then
       LastTwoDays = Now() - Weekday(Now(), 3)
    ElseIf Weekdy = 3 Then
       LastTwoDays = Now() - Weekday(Now(), 3)
    ElseIf Weekdy = 4 Then
       LastTwoDays = Now() - Weekday(Now(), 3)
    ElseIf Weekdy = 5 Then
       LastTwoDays = Now() - Weekday(Now(), 3)
    ElseIf Weekdy = 6 Then
       LastTwoDays = Now() - Weekday(Now(), 3)
    Else
       MsgBox "Today Satuarday OR Sunday Data is not Available"
    End If

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=12, Criteria1:="="

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=11, Criteria1:="<>"

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=11, Criteria1:=" TodayDT", Operator:=xlAnd, Criteria2:="LastTwoDays"

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).Copy

    Sheets.Add(After:=Sheets(Sheets.Count)).Name = "DRfeefollowup"

    Set Drfreefolup = ThisWorkbook.Worksheets("DRfeefollowup")

    Drfreefolup.Range("A1").PasteSpecial Paste:=xlPasteValues

    Application.CutCopyMode = False

    Data.AutoFilterMode = False

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=15, Criteria1:="yes"

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=19, Criteria1:="x"

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=12, Criteria1:="<>"

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=13, Criteria1:="<>"

    'Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).AutoFilter Field:=14, criterial:="<>"

    Data.Range("A1:AK" & Data.Range("A1").End(xlDown).Row).Copy

    Sheets.Add(After:=Sheets(Sheets.Count)).Name = "Drworkblefiles"

    Set Drworkblefiles = ThisWorkbook.Worksheets("Drworkblefiles")

    Drworkblefiles.Range("A1").PasteSpecial Paste:=xlPasteValues

    Application.CutCopyMode = False

    Data.Range("A1").AutoFilter

   End Sub

 Private Sub CommandButton2_Click()


    Sheets("Data").Range("A1:AJ" & Sheets("Data").Range("A1").End(xlDown).Row).Clear

    MsgBox "Please paste new data in data sheet"


End Sub

Axios get in url works but with second parameter as object it doesn't

axios.get accepts a request config as the second parameter (not query string params).

You can use the params config option to set query string params as follows:

axios.get('/api', {
  params: {
    foo: 'bar'
  }
});

Scatter plot and Color mapping in Python

Here is an example

import numpy as np
import matplotlib.pyplot as plt

x = np.random.rand(100)
y = np.random.rand(100)
t = np.arange(100)

plt.scatter(x, y, c=t)
plt.show()

Here you are setting the color based on the index, t, which is just an array of [1, 2, ..., 100]. enter image description here

Perhaps an easier-to-understand example is the slightly simpler

import numpy as np
import matplotlib.pyplot as plt

x = np.arange(100)
y = x
t = x
plt.scatter(x, y, c=t)
plt.show()

enter image description here

Note that the array you pass as c doesn't need to have any particular order or type, i.e. it doesn't need to be sorted or integers as in these examples. The plotting routine will scale the colormap such that the minimum/maximum values in c correspond to the bottom/top of the colormap.

Colormaps

You can change the colormap by adding

import matplotlib.cm as cm
plt.scatter(x, y, c=t, cmap=cm.cmap_name)

Importing matplotlib.cm is optional as you can call colormaps as cmap="cmap_name" just as well. There is a reference page of colormaps showing what each looks like. Also know that you can reverse a colormap by simply calling it as cmap_name_r. So either

plt.scatter(x, y, c=t, cmap=cm.cmap_name_r)
# or
plt.scatter(x, y, c=t, cmap="cmap_name_r")

will work. Examples are "jet_r" or cm.plasma_r. Here's an example with the new 1.5 colormap viridis:

import numpy as np
import matplotlib.pyplot as plt

x = np.arange(100)
y = x
t = x
fig, (ax1, ax2) = plt.subplots(1, 2)
ax1.scatter(x, y, c=t, cmap='viridis')
ax2.scatter(x, y, c=t, cmap='viridis_r')
plt.show()

Colorbars

You can add a colorbar by using

plt.scatter(x, y, c=t, cmap='viridis')
plt.colorbar()
plt.show()

Note that if you are using figures and subplots explicitly (e.g. fig, ax = plt.subplots() or ax = fig.add_subplot(111)), adding a colorbar can be a bit more involved. Good examples can be found here for a single subplot colorbar and here for 2 subplots 1 colorbar.

Import JavaScript file and call functions using webpack, ES6, ReactJS

Named exports:

Let's say you create a file called utils.js, with utility functions that you want to make available for other modules (e.g. a React component). Then you would make each function a named export:

export function add(x, y) {
  return x + y
}

export function mutiply(x, y) {
  return x * y
}

Assuming that utils.js is located in the same directory as your React component, you can use its exports like this:

import { add, multiply } from './utils.js';
...
add(2, 3) // Can be called wherever in your component, and would return 5.

Or if you prefer, place the entire module's contents under a common namespace:

import * as utils from './utils.js'; 
...
utils.multiply(2,3)

Default exports:

If you on the other hand have a module that only does one thing (could be a React class, a normal function, a constant, or anything else) and want to make that thing available to others, you can use a default export. Let's say we have a file log.js, with only one function that logs out whatever argument it's called with:

export default function log(message) {
  console.log(message);
}

This can now be used like this:

import log from './log.js';
...
log('test') // Would print 'test' in the console.

You don't have to call it log when you import it, you could actually call it whatever you want:

import logToConsole from './log.js';
...
logToConsole('test') // Would also print 'test' in the console.

Combined:

A module can have both a default export (max 1), and named exports (imported either one by one, or using * with an alias). React actually has this, consider:

import React, { Component, PropTypes } from 'react';

How to use FormData for AJAX file upload?

I can't add a comment above as I do not have enough reputation, but the above answer was nearly perfect for me, except I had to add

type: "POST"

to the .ajax call. I was scratching my head for a few minutes trying to figure out what I had done wrong, that's all it needed and works a treat. So this is the whole snippet:

Full credit to the answer above me, this is just a small tweak to that. This is just in case anyone else gets stuck and can't see the obvious.

  $.ajax({
    url: 'Your url here',
    data: formData,
    type: "POST", //ADDED THIS LINE
    // THIS MUST BE DONE FOR FILE UPLOADING
    contentType: false,
    processData: false,
    // ... Other options like success and etc
})

How to build and run Maven projects after importing into Eclipse IDE

1.Update project

Right Click on your project maven > update project

2.Build project

Right Click on your project again. run as > Maven build

If you have not created a “Run configuration” yet, it will open a new configuration with some auto filled values.

You can change the name. "Base directory" will be a auto filled value for you. Keep it as it is. Give maven command to ”Goals” fields.

i.e, “clean install” for building purpose

Click apply

Click run.

3.Run project on tomcat

Right Click on your project again. run as > Run-Configuration. It will open Run-Configuration window for you.

Right Click on “Maven Build” from the right side column and Select “New”. It will open a blank configuration for you.

Change the name as you want. For the base directory field you can choose values using 3 buttons(workspace,FileSystem,Variables). You can also copy and paste the auto generated value from previously created Run-configuration. Give the Goals as “tomcat:run”. Click apply. Click run.

If you want to get more clear idea with snapshots use the following link.

Build and Run Maven project in Eclipse

(I hope this answer will help someone come after the topic of the question)

How can I erase all inline styles with javascript and leave only the styles specified in the css style sheet?

I was using the $('div').attr('style', ''); technique and it wasn't working in IE8.

I outputted the style attribute using alert() and it was not stripping out inline styles.

.removeAttr ended up doing the trick in IE8.

bootstrap popover not showing on top of all elements

Problem solved with data-container="body" and z-index
1->
<div class="button btn-align"
data-container="body"  
data-toggle="popover"
data-placement="top"
title="Top"
data-trigger="hover"
data-title-backcolor="#fff"
data-content="A top aligned popover is a really boring thing in the real 
life.">Top</div>
2->
.ggpopover.in {
z-index: 9999 !important;
}

Passing a method as a parameter in Ruby

The normal Ruby way to do this is to use a block.

So it would be something like:

def weightedknn( data, vec1, k = 5 )
  foo
  weight = yield( dist )
  foo
end

And used like:

weightenknn( data, vec1 ) { |dist| gaussian( dist ) }

This pattern is used extensively in Ruby.

Compiling with g++ using multiple cores

GNU parallel

I was making a synthetic compilation benchmark and couldn't be bothered to write a Makefile, so I used:

sudo apt-get install parallel
ls | grep -E '\.c$' | parallel -t --will-cite "gcc -c -o '{.}.o' '{}'"

Explanation:

{.} takes the input argument and removes its extension
-t prints out the commands being run to give us an idea of progress
--will-cite removes the request to cite the software if you publish results using it...

parallel is so convenient that I could even do a timestamp check myself:

ls | grep -E '\.c$' | parallel -t --will-cite "\
  if ! [ -f '{.}.o' ] || [ '{}' -nt '{.}.o' ]; then
    gcc -c -o '{.}.o' '{}'
  fi
"

xargs -P can also run jobs in parallel, but it is a bit less convenient to do the extension manipulation or run multiple commands with it: Calling multiple commands through xargs

Parallel linking was asked at: Can gcc use multiple cores when linking?

TODO: I think I read somewhere that compilation can be reduced to matrix multiplication, so maybe it is also possible to speed up single file compilation for large files. But I can't find a reference now.

Tested in Ubuntu 18.10.

MySQL, Check if a column exists in a table with SQL

I am using this simple script:

mysql_query("select $column from $table") or mysql_query("alter table $table add $column varchar (20)");

It works if you are already connected to the database.

Save multiple sheets to .pdf

I recommend adding the following line after the export to PDF:

ThisWorkbook.Sheets("Sheet1").Select

(where eg. Sheet1 is the single sheet you want to be active afterwards)

Leaving multiple sheets in a selected state may cause problems executing some code. (eg. unprotect doesn't function properly when multiple sheets are actively selected.)

Need table of key codes for android and presenter

Complete list of key codes

Some of the other lists here are incomplete. The complete list can be found in the KeyEvent source code or documentation. The source code is ordered by integer value so I will use that here.

(Repetitive text removed to save space, all key codes are public static final int.)

/** Unknown key code. */
KEYCODE_UNKNOWN = 0;
/** Soft Left key.
 * Usually situated below the display on phones and used as a multi-function
 * feature key for selecting a software defined function shown on the bottom left
 * of the display. */
KEYCODE_SOFT_LEFT = 1;
/** Soft Right key.
 * Usually situated below the display on phones and used as a multi-function
 * feature key for selecting a software defined function shown on the bottom right
 * of the display. */
KEYCODE_SOFT_RIGHT = 2;
/** Home key.
 * This key is handled by the framework and is never delivered to applications. */
KEYCODE_HOME = 3;
/** Back key. */
KEYCODE_BACK = 4;
/** Call key. */
KEYCODE_CALL = 5;
/** End Call key. */
KEYCODE_ENDCALL = 6;
/** '0' key. */
KEYCODE_0 = 7;
/** '1' key. */
KEYCODE_1 = 8;
/** '2' key. */
KEYCODE_2 = 9;
/** '3' key. */
KEYCODE_3 = 10;
/** '4' key. */
KEYCODE_4 = 11;
/** '5' key. */
KEYCODE_5 = 12;
/** '6' key. */
KEYCODE_6 = 13;
/** '7' key. */
KEYCODE_7 = 14;
/** '8' key. */
KEYCODE_8 = 15;
/** '9' key. */
KEYCODE_9 = 16;
/** '*' key. */
KEYCODE_STAR = 17;
/** '#' key. */
KEYCODE_POUND = 18;
/** Directional Pad Up key.
 * May also be synthesized from trackball motions. */
KEYCODE_DPAD_UP = 19;
/** Directional Pad Down key.
 * May also be synthesized from trackball motions. */
KEYCODE_DPAD_DOWN = 20;
/** Directional Pad Left key.
 * May also be synthesized from trackball motions. */
KEYCODE_DPAD_LEFT = 21;
/** Directional Pad Right key.
 * May also be synthesized from trackball motions. */
KEYCODE_DPAD_RIGHT = 22;
/** Directional Pad Center key.
 * May also be synthesized from trackball motions. */
KEYCODE_DPAD_CENTER = 23;
/** Volume Up key.
 * Adjusts the speaker volume up. */
KEYCODE_VOLUME_UP = 24;
/** Volume Down key.
 * Adjusts the speaker volume down. */
KEYCODE_VOLUME_DOWN = 25;
/** Power key. */
KEYCODE_POWER = 26;
/** Camera key.
 * Used to launch a camera application or take pictures. */
KEYCODE_CAMERA = 27;
/** Clear key. */
KEYCODE_CLEAR = 28;
/** 'A' key. */
KEYCODE_A = 29;
/** 'B' key. */
KEYCODE_B = 30;
/** 'C' key. */
KEYCODE_C = 31;
/** 'D' key. */
KEYCODE_D = 32;
/** 'E' key. */
KEYCODE_E = 33;
/** 'F' key. */
KEYCODE_F = 34;
/** 'G' key. */
KEYCODE_G = 35;
/** 'H' key. */
KEYCODE_H = 36;
/** 'I' key. */
KEYCODE_I = 37;
/** 'J' key. */
KEYCODE_J = 38;
/** 'K' key. */
KEYCODE_K = 39;
/** 'L' key. */
KEYCODE_L = 40;
/** 'M' key. */
KEYCODE_M = 41;
/** 'N' key. */
KEYCODE_N = 42;
/** 'O' key. */
KEYCODE_O = 43;
/** 'P' key. */
KEYCODE_P = 44;
/** 'Q' key. */
KEYCODE_Q = 45;
/** 'R' key. */
KEYCODE_R = 46;
/** 'S' key. */
KEYCODE_S = 47;
/** 'T' key. */
KEYCODE_T = 48;
/** 'U' key. */
KEYCODE_U = 49;
/** 'V' key. */
KEYCODE_V = 50;
/** 'W' key. */
KEYCODE_W = 51;
/** 'X' key. */
KEYCODE_X = 52;
/** 'Y' key. */
KEYCODE_Y = 53;
/** 'Z' key. */
KEYCODE_Z = 54;
/** ',' key. */
KEYCODE_COMMA = 55;
/** '.' key. */
KEYCODE_PERIOD = 56;
/** Left Alt modifier key. */
KEYCODE_ALT_LEFT = 57;
/** Right Alt modifier key. */
KEYCODE_ALT_RIGHT = 58;
/** Left Shift modifier key. */
KEYCODE_SHIFT_LEFT = 59;
/** Right Shift modifier key. */
KEYCODE_SHIFT_RIGHT = 60;
/** Tab key. */
KEYCODE_TAB = 61;
/** Space key. */
KEYCODE_SPACE = 62;
/** Symbol modifier key.
 * Used to enter alternate symbols. */
KEYCODE_SYM = 63;
/** Explorer special function key.
 * Used to launch a browser application. */
KEYCODE_EXPLORER = 64;
/** Envelope special function key.
 * Used to launch a mail application. */
KEYCODE_ENVELOPE = 65;
/** Enter key. */
KEYCODE_ENTER = 66;
/** Backspace key.
 * Deletes characters before the insertion point, unlike {@link #KEYCODE_FORWARD_DEL}. */
KEYCODE_DEL = 67;
/** '`' (backtick) key. */
KEYCODE_GRAVE = 68;
/** '-'. */
KEYCODE_MINUS = 69;
/** '=' key. */
KEYCODE_EQUALS = 70;
/** '[' key. */
KEYCODE_LEFT_BRACKET = 71;
/** ']' key. */
KEYCODE_RIGHT_BRACKET = 72;
/** '\' key. */
KEYCODE_BACKSLASH = 73;
/** ';' key. */
KEYCODE_SEMICOLON = 74;
/** ''' (apostrophe) key. */
KEYCODE_APOSTROPHE = 75;
/** '/' key. */
KEYCODE_SLASH = 76;
/** '@' key. */
KEYCODE_AT = 77;
/** Number modifier key.
 * Used to enter numeric symbols.
 * This key is not Num Lock; it is more like {@link #KEYCODE_ALT_LEFT} and is
 * interpreted as an ALT key by {@link android.text.method.MetaKeyKeyListener}. */
KEYCODE_NUM = 78;
/** Headset Hook key.
 * Used to hang up calls and stop media. */
KEYCODE_HEADSETHOOK = 79;
/** Camera Focus key.
 * Used to focus the camera. */
KEYCODE_FOCUS = 80; // *Camera* focus
/** '+' key. */
KEYCODE_PLUS = 81;
/** Menu key. */
KEYCODE_MENU = 82;
/** Notification key. */
KEYCODE_NOTIFICATION = 83;
/** Search key. */
KEYCODE_SEARCH = 84;
/** Play/Pause media key. */
KEYCODE_MEDIA_PLAY_PAUSE= 85;
/** Stop media key. */
KEYCODE_MEDIA_STOP = 86;
/** Play Next media key. */
KEYCODE_MEDIA_NEXT = 87;
/** Play Previous media key. */
KEYCODE_MEDIA_PREVIOUS = 88;
/** Rewind media key. */
KEYCODE_MEDIA_REWIND = 89;
/** Fast Forward media key. */
KEYCODE_MEDIA_FAST_FORWARD = 90;
/** Mute key.
 * Mutes the microphone, unlike {@link #KEYCODE_VOLUME_MUTE}. */
KEYCODE_MUTE = 91;
/** Page Up key. */
KEYCODE_PAGE_UP = 92;
/** Page Down key. */
KEYCODE_PAGE_DOWN = 93;
/** Picture Symbols modifier key.
 * Used to switch symbol sets (Emoji, Kao-moji). */
KEYCODE_PICTSYMBOLS = 94; // switch symbol-sets (Emoji,Kao-moji)
/** Switch Charset modifier key.
 * Used to switch character sets (Kanji, Katakana). */
KEYCODE_SWITCH_CHARSET = 95; // switch char-sets (Kanji,Katakana)
/** A Button key.
 * On a game controller, the A button should be either the button labeled A
 * or the first button on the bottom row of controller buttons. */
KEYCODE_BUTTON_A = 96;
/** B Button key.
 * On a game controller, the B button should be either the button labeled B
 * or the second button on the bottom row of controller buttons. */
KEYCODE_BUTTON_B = 97;
/** C Button key.
 * On a game controller, the C button should be either the button labeled C
 * or the third button on the bottom row of controller buttons. */
KEYCODE_BUTTON_C = 98;
/** X Button key.
 * On a game controller, the X button should be either the button labeled X
 * or the first button on the upper row of controller buttons. */
KEYCODE_BUTTON_X = 99;
/** Y Button key.
 * On a game controller, the Y button should be either the button labeled Y
 * or the second button on the upper row of controller buttons. */
KEYCODE_BUTTON_Y = 100;
/** Z Button key.
 * On a game controller, the Z button should be either the button labeled Z
 * or the third button on the upper row of controller buttons. */
KEYCODE_BUTTON_Z = 101;
/** L1 Button key.
 * On a game controller, the L1 button should be either the button labeled L1 (or L)
 * or the top left trigger button. */
KEYCODE_BUTTON_L1 = 102;
/** R1 Button key.
 * On a game controller, the R1 button should be either the button labeled R1 (or R)
 * or the top right trigger button. */
KEYCODE_BUTTON_R1 = 103;
/** L2 Button key.
 * On a game controller, the L2 button should be either the button labeled L2
 * or the bottom left trigger button. */
KEYCODE_BUTTON_L2 = 104;
/** R2 Button key.
 * On a game controller, the R2 button should be either the button labeled R2
 * or the bottom right trigger button. */
KEYCODE_BUTTON_R2 = 105;
/** Left Thumb Button key.
 * On a game controller, the left thumb button indicates that the left (or only)
 * joystick is pressed. */
KEYCODE_BUTTON_THUMBL = 106;
/** Right Thumb Button key.
 * On a game controller, the right thumb button indicates that the right
 * joystick is pressed. */
KEYCODE_BUTTON_THUMBR = 107;
/** Start Button key.
 * On a game controller, the button labeled Start. */
KEYCODE_BUTTON_START = 108;
/** Select Button key.
 * On a game controller, the button labeled Select. */
KEYCODE_BUTTON_SELECT = 109;
/** Mode Button key.
 * On a game controller, the button labeled Mode. */
KEYCODE_BUTTON_MODE = 110;
/** Escape key. */
KEYCODE_ESCAPE = 111;
/** Forward Delete key.
 * Deletes characters ahead of the insertion point, unlike {@link #KEYCODE_DEL}. */
KEYCODE_FORWARD_DEL = 112;
/** Left Control modifier key. */
KEYCODE_CTRL_LEFT = 113;
/** Right Control modifier key. */
KEYCODE_CTRL_RIGHT = 114;
/** Caps Lock key. */
KEYCODE_CAPS_LOCK = 115;
/** Scroll Lock key. */
KEYCODE_SCROLL_LOCK = 116;
/** Left Meta modifier key. */
KEYCODE_META_LEFT = 117;
/** Right Meta modifier key. */
KEYCODE_META_RIGHT = 118;
/** Function modifier key. */
KEYCODE_FUNCTION = 119;
/** System Request / Print Screen key. */
KEYCODE_SYSRQ = 120;
/** Break / Pause key. */
KEYCODE_BREAK = 121;
/** Home Movement key.
 * Used for scrolling or moving the cursor around to the start of a line
 * or to the top of a list. */
KEYCODE_MOVE_HOME = 122;
/** End Movement key.
 * Used for scrolling or moving the cursor around to the end of a line
 * or to the bottom of a list. */
KEYCODE_MOVE_END = 123;
/** Insert key.
 * Toggles insert / overwrite edit mode. */
KEYCODE_INSERT = 124;
/** Forward key.
 * Navigates forward in the history stack. Complement of {@link #KEYCODE_BACK}. */
KEYCODE_FORWARD = 125;
/** Play media key. */
KEYCODE_MEDIA_PLAY = 126;
/** Pause media key. */
KEYCODE_MEDIA_PAUSE = 127;
/** Close media key.
 * May be used to close a CD tray, for example. */
KEYCODE_MEDIA_CLOSE = 128;
/** Eject media key.
 * May be used to eject a CD tray, for example. */
KEYCODE_MEDIA_EJECT = 129;
/** Record media key. */
KEYCODE_MEDIA_RECORD = 130;
/** F1 key. */
KEYCODE_F1 = 131;
/** F2 key. */
KEYCODE_F2 = 132;
/** F3 key. */
KEYCODE_F3 = 133;
/** F4 key. */
KEYCODE_F4 = 134;
/** F5 key. */
KEYCODE_F5 = 135;
/** F6 key. */
KEYCODE_F6 = 136;
/** F7 key. */
KEYCODE_F7 = 137;
/** F8 key. */
KEYCODE_F8 = 138;
/** F9 key. */
KEYCODE_F9 = 139;
/** F10 key. */
KEYCODE_F10 = 140;
/** F11 key. */
KEYCODE_F11 = 141;
/** F12 key. */
KEYCODE_F12 = 142;
/** Num Lock key.
 * This is the Num Lock key; it is different from {@link #KEYCODE_NUM}.
 * This key alters the behavior of other keys on the numeric keypad. */
KEYCODE_NUM_LOCK = 143;
/** Numeric keypad '0' key. */
KEYCODE_NUMPAD_0 = 144;
/** Numeric keypad '1' key. */
KEYCODE_NUMPAD_1 = 145;
/** Numeric keypad '2' key. */
KEYCODE_NUMPAD_2 = 146;
/** Numeric keypad '3' key. */
KEYCODE_NUMPAD_3 = 147;
/** Numeric keypad '4' key. */
KEYCODE_NUMPAD_4 = 148;
/** Numeric keypad '5' key. */
KEYCODE_NUMPAD_5 = 149;
/** Numeric keypad '6' key. */
KEYCODE_NUMPAD_6 = 150;
/** Numeric keypad '7' key. */
KEYCODE_NUMPAD_7 = 151;
/** Numeric keypad '8' key. */
KEYCODE_NUMPAD_8 = 152;
/** Numeric keypad '9' key. */
KEYCODE_NUMPAD_9 = 153;
/** Numeric keypad '/' key (for division). */
KEYCODE_NUMPAD_DIVIDE = 154;
/** Numeric keypad '*' key (for multiplication). */
KEYCODE_NUMPAD_MULTIPLY = 155;
/** Numeric keypad '-' key (for subtraction). */
KEYCODE_NUMPAD_SUBTRACT = 156;
/** Numeric keypad '+' key (for addition). */
KEYCODE_NUMPAD_ADD = 157;
/** Numeric keypad '.' key (for decimals or digit grouping). */
KEYCODE_NUMPAD_DOT = 158;
/** Numeric keypad ',' key (for decimals or digit grouping). */
KEYCODE_NUMPAD_COMMA = 159;
/** Numeric keypad Enter key. */
KEYCODE_NUMPAD_ENTER = 160;
/** Numeric keypad '=' key. */
KEYCODE_NUMPAD_EQUALS = 161;
/** Numeric keypad '(' key. */
KEYCODE_NUMPAD_LEFT_PAREN = 162;
/** Numeric keypad ')' key. */
KEYCODE_NUMPAD_RIGHT_PAREN = 163;
/** Volume Mute key.
 * Mutes the speaker, unlike {@link #KEYCODE_MUTE}.
 * This key should normally be implemented as a toggle such that the first press
 * mutes the speaker and the second press restores the original volume. */
KEYCODE_VOLUME_MUTE = 164;
/** Info key.
 * Common on TV remotes to show additional information related to what is
 * currently being viewed. */
KEYCODE_INFO = 165;
/** Channel up key.
 * On TV remotes, increments the television channel. */
KEYCODE_CHANNEL_UP = 166;
/** Channel down key.
 * On TV remotes, decrements the television channel. */
KEYCODE_CHANNEL_DOWN = 167;
/** Zoom in key. */
KEYCODE_ZOOM_IN = 168;
/** Zoom out key. */
KEYCODE_ZOOM_OUT = 169;
/** TV key.
 * On TV remotes, switches to viewing live TV. */
KEYCODE_TV = 170;
/** Window key.
 * On TV remotes, toggles picture-in-picture mode or other windowing functions. */
KEYCODE_WINDOW = 171;
/** Guide key.
 * On TV remotes, shows a programming guide. */
KEYCODE_GUIDE = 172;
/** DVR key.
 * On some TV remotes, switches to a DVR mode for recorded shows. */
KEYCODE_DVR = 173;
/** Bookmark key.
 * On some TV remotes, bookmarks content or web pages. */
KEYCODE_BOOKMARK = 174;
/** Toggle captions key.
 * Switches the mode for closed-captioning text, for example during television shows. */
KEYCODE_CAPTIONS = 175;
/** Settings key.
 * Starts the system settings activity. */
KEYCODE_SETTINGS = 176;
/** TV power key.
 * On TV remotes, toggles the power on a television screen. */
KEYCODE_TV_POWER = 177;
/** TV input key.
 * On TV remotes, switches the input on a television screen. */
KEYCODE_TV_INPUT = 178;
/** Set-top-box power key.
 * On TV remotes, toggles the power on an external Set-top-box. */
KEYCODE_STB_POWER = 179;
/** Set-top-box input key.
 * On TV remotes, switches the input mode on an external Set-top-box. */
KEYCODE_STB_INPUT = 180;
/** A/V Receiver power key.
 * On TV remotes, toggles the power on an external A/V Receiver. */
KEYCODE_AVR_POWER = 181;
/** A/V Receiver input key.
 * On TV remotes, switches the input mode on an external A/V Receiver. */
KEYCODE_AVR_INPUT = 182;
/** Red "programmable" key.
 * On TV remotes, acts as a contextual/programmable key. */
KEYCODE_PROG_RED = 183;
/** Green "programmable" key.
 * On TV remotes, actsas a contextual/programmable key. */
KEYCODE_PROG_GREEN = 184;
/** Yellow "programmable" key.
 * On TV remotes, acts as a contextual/programmable key. */
KEYCODE_PROG_YELLOW = 185;
/** Blue "programmable" key.
 * On TV remotes, acts as a contextual/programmable key. */
KEYCODE_PROG_BLUE = 186;
/** App switch key.
 * Should bring up the application switcher dialog. */
KEYCODE_APP_SWITCH = 187;
/** Generic Game Pad Button #1.*/
KEYCODE_BUTTON_1 = 188;
/** Generic Game Pad Button #2.*/
KEYCODE_BUTTON_2 = 189;
/** Generic Game Pad Button #3.*/
KEYCODE_BUTTON_3 = 190;
/** Generic Game Pad Button #4.*/
KEYCODE_BUTTON_4 = 191;
/** Generic Game Pad Button #5.*/
KEYCODE_BUTTON_5 = 192;
/** Generic Game Pad Button #6.*/
KEYCODE_BUTTON_6 = 193;
/** Generic Game Pad Button #7.*/
KEYCODE_BUTTON_7 = 194;
/** Generic Game Pad Button #8.*/
KEYCODE_BUTTON_8 = 195;
/** Generic Game Pad Button #9.*/
KEYCODE_BUTTON_9 = 196;
/** Generic Game Pad Button #10.*/
KEYCODE_BUTTON_10 = 197;
/** Generic Game Pad Button #11.*/
KEYCODE_BUTTON_11 = 198;
/** Generic Game Pad Button #12.*/
KEYCODE_BUTTON_12 = 199;
/** Generic Game Pad Button #13.*/
KEYCODE_BUTTON_13 = 200;
/** Generic Game Pad Button #14.*/
KEYCODE_BUTTON_14 = 201;
/** Generic Game Pad Button #15.*/
KEYCODE_BUTTON_15 = 202;
/** Generic Game Pad Button #16.*/
KEYCODE_BUTTON_16 = 203;
/** Language Switch key.
 * Toggles the current input language such as switching between English and Japanese on
 * a QWERTY keyboard. On some devices, the same function may be performed by
 * pressing Shift+Spacebar. */
KEYCODE_LANGUAGE_SWITCH = 204;
/** Manner Mode key.
 * Toggles silent or vibrate mode on and off to make the device behave more politely
 * in certain settings such as on a crowded train. On some devices, the key may only
 * operate when long-pressed. */
KEYCODE_MANNER_MODE = 205;
/** 3D Mode key.
 * Toggles the display between 2D and 3D mode. */
KEYCODE_3D_MODE = 206;
/** Contacts special function key.
 * Used to launch an address book application. */
KEYCODE_CONTACTS = 207;
/** Calendar special function key.
 * Used to launch a calendar application. */
KEYCODE_CALENDAR = 208;
/** Music special function key.
 * Used to launch a music player application. */
KEYCODE_MUSIC = 209;
/** Calculator special function key.
 * Used to launch a calculator application. */
KEYCODE_CALCULATOR = 210;
/** Japanese full-width / half-width key. */
KEYCODE_ZENKAKU_HANKAKU = 211;
/** Japanese alphanumeric key. */
KEYCODE_EISU = 212;
/** Japanese non-conversion key. */
KEYCODE_MUHENKAN = 213;
/** Japanese conversion key. */
KEYCODE_HENKAN = 214;
/** Japanese katakana / hiragana key. */
KEYCODE_KATAKANA_HIRAGANA = 215;
/** Japanese Yen key. */
KEYCODE_YEN = 216;
/** Japanese Ro key. */
KEYCODE_RO = 217;
/** Japanese kana key. */
KEYCODE_KANA = 218;
/** Assist key.
 * Launches the global assist activity. Not delivered to applications. */
KEYCODE_ASSIST = 219;
/** Brightness Down key.
 * Adjusts the screen brightness down. */
KEYCODE_BRIGHTNESS_DOWN = 220;
/** Brightness Up key.
 * Adjusts the screen brightness up. */
KEYCODE_BRIGHTNESS_UP = 221;
/** Audio Track key.
 * Switches the audio tracks. */
KEYCODE_MEDIA_AUDIO_TRACK = 222;
/** Sleep key.
 * Puts the device to sleep. Behaves somewhat like {@link #KEYCODE_POWER} but it
 * has no effect if the device is already asleep. */
KEYCODE_SLEEP = 223;
/** Wakeup key.
 * Wakes up the device. Behaves somewhat like {@link #KEYCODE_POWER} but it
 * has no effect if the device is already awake. */
KEYCODE_WAKEUP = 224;
/** Pairing key.
 * Initiates peripheral pairing mode. Useful for pairing remote control
 * devices or game controllers, especially if no other input mode is
 * available. */
KEYCODE_PAIRING = 225;
/** Media Top Menu key.
 * Goes to the top of media menu. */
KEYCODE_MEDIA_TOP_MENU = 226;
/** '11' key. */
KEYCODE_11 = 227;
/** '12' key. */
KEYCODE_12 = 228;
/** Last Channel key.
 * Goes to the last viewed channel. */
KEYCODE_LAST_CHANNEL = 229;
/** TV data service key.
 * Displays data services like weather, sports. */
KEYCODE_TV_DATA_SERVICE = 230;
/** Voice Assist key.
 * Launches the global voice assist activity. Not delivered to applications. */
KEYCODE_VOICE_ASSIST = 231;
/** Radio key.
 * Toggles TV service / Radio service. */
KEYCODE_TV_RADIO_SERVICE = 232;
/** Teletext key.
 * Displays Teletext service. */
KEYCODE_TV_TELETEXT = 233;
/** Number entry key.
 * Initiates to enter multi-digit channel nubmber when each digit key is assigned
 * for selecting separate channel. Corresponds to Number Entry Mode (0x1D) of CEC
 * User Control Code. */
KEYCODE_TV_NUMBER_ENTRY = 234;
/** Analog Terrestrial key.
 * Switches to analog terrestrial broadcast service. */
KEYCODE_TV_TERRESTRIAL_ANALOG = 235;
/** Digital Terrestrial key.
 * Switches to digital terrestrial broadcast service. */
KEYCODE_TV_TERRESTRIAL_DIGITAL = 236;
/** Satellite key.
 * Switches to digital satellite broadcast service. */
KEYCODE_TV_SATELLITE = 237;
/** BS key.
 * Switches to BS digital satellite broadcasting service available in Japan. */
KEYCODE_TV_SATELLITE_BS = 238;
/** CS key.
 * Switches to CS digital satellite broadcasting service available in Japan. */
KEYCODE_TV_SATELLITE_CS = 239;
/** BS/CS key.
 * Toggles between BS and CS digital satellite services. */
KEYCODE_TV_SATELLITE_SERVICE = 240;
/** Toggle Network key.
 * Toggles selecting broacast services. */
KEYCODE_TV_NETWORK = 241;
/** Antenna/Cable key.
 * Toggles broadcast input source between antenna and cable. */
KEYCODE_TV_ANTENNA_CABLE = 242;
/** HDMI #1 key.
 * Switches to HDMI input #1. */
KEYCODE_TV_INPUT_HDMI_1 = 243;
/** HDMI #2 key.
 * Switches to HDMI input #2. */
KEYCODE_TV_INPUT_HDMI_2 = 244;
/** HDMI #3 key.
 * Switches to HDMI input #3. */
KEYCODE_TV_INPUT_HDMI_3 = 245;
/** HDMI #4 key.
 * Switches to HDMI input #4. */
KEYCODE_TV_INPUT_HDMI_4 = 246;
/** Composite #1 key.
 * Switches to composite video input #1. */
KEYCODE_TV_INPUT_COMPOSITE_1 = 247;
/** Composite #2 key.
 * Switches to composite video input #2. */
KEYCODE_TV_INPUT_COMPOSITE_2 = 248;
/** Component #1 key.
 * Switches to component video input #1. */
KEYCODE_TV_INPUT_COMPONENT_1 = 249;
/** Component #2 key.
 * Switches to component video input #2. */
KEYCODE_TV_INPUT_COMPONENT_2 = 250;
/** VGA #1 key.
 * Switches to VGA (analog RGB) input #1. */
KEYCODE_TV_INPUT_VGA_1 = 251;
/** Audio description key.
 * Toggles audio description off / on. */
KEYCODE_TV_AUDIO_DESCRIPTION = 252;
/** Audio description mixing volume up key.
 * Louden audio description volume as compared with normal audio volume. */
KEYCODE_TV_AUDIO_DESCRIPTION_MIX_UP = 253;
/** Audio description mixing volume down key.
 * Lessen audio description volume as compared with normal audio volume. */
KEYCODE_TV_AUDIO_DESCRIPTION_MIX_DOWN = 254;
/** Zoom mode key.
 * Changes Zoom mode (Normal, Full, Zoom, Wide-zoom, etc.) */
KEYCODE_TV_ZOOM_MODE = 255;
/** Contents menu key.
 * Goes to the title list. Corresponds to Contents Menu (0x0B) of CEC User Control
 * Code */
KEYCODE_TV_CONTENTS_MENU = 256;
/** Media context menu key.
 * Goes to the context menu of media contents. Corresponds to Media Context-sensitive
 * Menu (0x11) of CEC User Control Code. */
KEYCODE_TV_MEDIA_CONTEXT_MENU = 257;
/** Timer programming key.
 * Goes to the timer recording menu. Corresponds to Timer Programming (0x54) of
 * CEC User Control Code. */
KEYCODE_TV_TIMER_PROGRAMMING = 258;
/** Help key. */
KEYCODE_HELP = 259;
/** Navigate to previous key.
 * Goes backward by one item in an ordered collection of items. */
KEYCODE_NAVIGATE_PREVIOUS = 260;
/** Navigate to next key.
 * Advances to the next item in an ordered collection of items. */
KEYCODE_NAVIGATE_NEXT = 261;
/** Navigate in key.
 * Activates the item that currently has focus or expands to the next level of a navigation
 * hierarchy. */
KEYCODE_NAVIGATE_IN = 262;
/** Navigate out key.
 * Backs out one level of a navigation hierarchy or collapses the item that currently has
 * focus. */
KEYCODE_NAVIGATE_OUT = 263;
/** Primary stem key for Wear
 * Main power/reset button on watch. */
KEYCODE_STEM_PRIMARY = 264;
/** Generic stem key 1 for Wear */
KEYCODE_STEM_1 = 265;
/** Generic stem key 2 for Wear */
KEYCODE_STEM_2 = 266;
/** Generic stem key 3 for Wear */
KEYCODE_STEM_3 = 267;
/** Directional Pad Up-Left */
KEYCODE_DPAD_UP_LEFT = 268;
/** Directional Pad Down-Left */
KEYCODE_DPAD_DOWN_LEFT = 269;
/** Directional Pad Up-Right */
KEYCODE_DPAD_UP_RIGHT = 270;
/** Directional Pad Down-Right */
KEYCODE_DPAD_DOWN_RIGHT = 271;
/** Skip forward media key. */
KEYCODE_MEDIA_SKIP_FORWARD = 272;
/** Skip backward media key. */
KEYCODE_MEDIA_SKIP_BACKWARD = 273;
/** Step forward media key.
 * Steps media forward, one frame at a time. */
KEYCODE_MEDIA_STEP_FORWARD = 274;
/** Step backward media key.
 * Steps media backward, one frame at a time. */
KEYCODE_MEDIA_STEP_BACKWARD = 275;
/** put device to sleep unless a wakelock is held. */
KEYCODE_SOFT_SLEEP = 276;
/** Cut key. */
KEYCODE_CUT = 277;
/** Copy key. */
KEYCODE_COPY = 278;
/** Paste key. */
KEYCODE_PASTE = 279;
/** Consumed by the system for navigation up */
KEYCODE_SYSTEM_NAVIGATION_UP = 280;
/** Consumed by the system for navigation down */
KEYCODE_SYSTEM_NAVIGATION_DOWN = 281;
/** Consumed by the system for navigation left*/
KEYCODE_SYSTEM_NAVIGATION_LEFT = 282;
/** Consumed by the system for navigation right */
KEYCODE_SYSTEM_NAVIGATION_RIGHT = 283;

Notes

Currently the last key code is KEYCODE_SYSTEM_NAVIGATION_RIGHT, which is 283 (but check the source code to make sure this is still true). So you could loop through them like this:
```
for (int keyCode = 0; keyCode <= 283; keyCode++) {

}
```
Most input to EditText (or a custom view that accepts keyboard input) from an Input Method Editor (IME) is done using an Input Connection, so many key codes are not sent at all in this case. See this answer.

How to simulate a click with JavaScript?

Here's what I cooked up. It's pretty simple, but it works:

function eventFire(el, etype){
  if (el.fireEvent) {
    el.fireEvent('on' + etype);
  } else {
    var evObj = document.createEvent('Events');
    evObj.initEvent(etype, true, false);
    el.dispatchEvent(evObj);
  }
}

Usage:

eventFire(document.getElementById('mytest1'), 'click');

Detecting an undefined object property

function isUnset(inp) {
  return (typeof inp === 'undefined')
}

Returns false if variable is set, and true if is undefined.

Then use:

if (isUnset(var)) {
  // initialize variable here
}

Generate random colors (RGB)

color = lambda : [random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)]

byte array to pdf

Usually this happens if something is wrong with the byte array.

File.WriteAllBytes("filename.PDF", Byte[]);

This creates a new file, writes the specified byte array to the file, and then closes the file. If the target file already exists, it is overwritten.

Asynchronous implementation of this is also available.

public static System.Threading.Tasks.Task WriteAllBytesAsync 
(string path, byte[] bytes, System.Threading.CancellationToken cancellationToken = null);

Where is NuGet.Config file located in Visual Studio project?

I have created an answer for this post that might help: https://stackoverflow.com/a/63816822/2399164

Summary:

I am a little late to the game but I believe I found a simple solution to this problem...

Create a "NuGet.Config" file in the same directory as your .sln

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
    <add key="{{CUSTOM NAME}}" value="{{CUSTOM SOURCE}}" />
  </packageSources>
  <packageRestore>
    <add key="enabled" value="True" />
    <add key="automatic" value="True" />
  </packageRestore>
  <bindingRedirects>
    <add key="skip" value="False" />
  </bindingRedirects>
  <packageManagement>
    <add key="format" value="0" />
    <add key="disabled" value="False" />
  </packageManagement>
</configuration>

That is it! Create your "Dockerfile" here as well
Run docker build with your Dockerfile and all will get resolved

XPath to select Element by attribute value

As a follow on, you could select "all nodes with a particular attribute" like this:

//*[@id='4']

How to create module-wide variables in Python?

Explicit access to module level variables by accessing them explicity on the module

In short: The technique described here is the same as in steveha's answer, except, that no artificial helper object is created to explicitly scope variables. Instead the module object itself is given a variable pointer, and therefore provides explicit scoping upon access from everywhere. (like assignments in local function scope).

Think of it like self for the current module instead of the current instance !

# db.py
import sys

# this is a pointer to the module object instance itself.
this = sys.modules[__name__]

# we can explicitly make assignments on it 
this.db_name = None

def initialize_db(name):
    if (this.db_name is None):
        # also in local function scope. no scope specifier like global is needed
        this.db_name = name
        # also the name remains free for local use
        db_name = "Locally scoped db_name variable. Doesn't do anything here."
    else:
        msg = "Database is already initialized to {0}."
        raise RuntimeError(msg.format(this.db_name))

As modules are cached and therefore import only once, you can import db.py as often on as many clients as you want, manipulating the same, universal state:

# client_a.py
import db

db.initialize_db('mongo')

# client_b.py
import db

if (db.db_name == 'mongo'):
    db.db_name = None  # this is the preferred way of usage, as it updates the value for all clients, because they access the same reference from the same module object

# client_c.py
from db import db_name
# be careful when importing like this, as a new reference "db_name" will
# be created in the module namespace of client_c, which points to the value 
# that "db.db_name" has at import time of "client_c".

if (db_name == 'mongo'):  # checking is fine if "db.db_name" doesn't change
    db_name = None  # be careful, because this only assigns the reference client_c.db_name to a new value, but leaves db.db_name pointing to its current value.

As an additional bonus I find it quite pythonic overall as it nicely fits Pythons policy of Explicit is better than implicit.

How to print an exception in Python 3?

[In Python3]

Let's say you want to handle an IndexError and print the traceback, you can do the following:

from traceback import print_tb 
empty_list = [] 
try: 
    x = empty_list[100]
except IndexError as index_error: 
    print_tb(index_error.__traceback__)

Note: You can use the format_tb function instead of print_tb to get the traceback as a string for logging purposes. Hope this helps.

How Can I Truncate A String In jQuery?

  function truncateString(str, length) {
     return str.length > length ? str.substring(0, length - 3) + '...' : str
  }

Connect to mysql on Amazon EC2 from a remote server

It could be that you have not configured the Amazon Security Group assigned to your EC2 Instance to accept incoming requests on port 3306 (default port for MySQL).

If this is the case then you can easily open up the port for the security group in a few button clicks:

1) Log into you AWS Console and go to 'EC2'

2) On the left hand menu under 'Network & Security' go to 'Security Groups'

3) Check the Security Group in question

4) Click on 'Inbound tab'

5) Choose 'MYSQL' from drop down list and click 'Add Rule'

Might not be the reason but worth a go...

time delayed redirect?

You can include this directly in your buttun. It works very well. I hope it'll be useful for you. onclick="setTimeout('location.href = ../../dashboard.xhtml;', 7000);"

Convert json to a C# array?

just take the string and use the JavaScriptSerializer to deserialize it into a native object. For example, having this json:

string json = "[{Name:'John Simith',Age:35},{Name:'Pablo Perez',Age:34}]";

You'd need to create a C# class called, for example, Person defined as so:

public class Person
{
 public int Age {get;set;}
 public string Name {get;set;}
}

You can now deserialize the JSON string into an array of Person by doing:

JavaScriptSerializer js = new JavaScriptSerializer();
Person [] persons =  js.Deserialize<Person[]>(json);

Here's a link to JavaScriptSerializer documentation.

~~Note: my code above was not tested but that's the idea~~ Tested it. Unless you are doing something "exotic", you should be fine using the JavascriptSerializer.

Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_u64 on Intel CPUs

First of all, try to estimate peak performance - examine https://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-optimization-manual.pdf, in particular, Appendix C.

In your case, it's table C-10 that shows POPCNT instruction has latency = 3 clocks and throughput = 1 clock. Throughput shows your maximal rate in clocks (multiply by core frequency and 8 bytes in case of popcnt64 to get your best possible bandwidth number).

Now examine what compiler did and sum up throughputs of all other instructions in the loop. This will give best possible estimate for generated code.

At last, look at data dependencies between instructions in the loop as they will force latency-large delay instead of throughput - so split instructions of single iteration on data flow chains and calculate latency across them then naively pick up maximal from them. it will give rough estimate taking into account data flow dependencies.

However, in your case, just writing code the right way would eliminate all these complexities. Instead of accumulating to the same count variable, just accumulate to different ones (like count0, count1, ... count8) and sum them up at the end. Or even create an array of counts[8] and accumulate to its elements - perhaps, it will be vectorized even and you will get much better throughput.

P.S. and never run benchmark for a second, first warm up the core then run loop for at least 10 seconds or better 100 seconds. otherwise, you will test power management firmware and DVFS implementation in hardware :)

P.P.S. I heard endless debates on how much time should benchmark really run. Most smartest folks are even asking why 10 seconds not 11 or 12. I should admit this is funny in theory. In practice, you just go and run benchmark hundred times in a row and record deviations. That IS funny. Most people do change source and run bench after that exactly ONCE to capture new performance record. Do the right things right.

Not convinced still? Just use above C-version of benchmark by assp1r1n3 (https://stackoverflow.com/a/37026212/9706746) and try 100 instead of 10000 in retry loop.

My 7960X shows, with RETRY=100:

Count: 203182300 Elapsed: 0.008385 seconds Speed: 12.505379 GB/s

Count: 203182300 Elapsed: 0.011063 seconds Speed: 9.478225 GB/s

Count: 203182300 Elapsed: 0.011188 seconds Speed: 9.372327 GB/s

Count: 203182300 Elapsed: 0.010393 seconds Speed: 10.089252 GB/s

Count: 203182300 Elapsed: 0.009076 seconds Speed: 11.553283 GB/s

with RETRY=10000:

Count: 20318230000 Elapsed: 0.661791 seconds Speed: 15.844519 GB/s

Count: 20318230000 Elapsed: 0.665422 seconds Speed: 15.758060 GB/s

Count: 20318230000 Elapsed: 0.660983 seconds Speed: 15.863888 GB/s

Count: 20318230000 Elapsed: 0.665337 seconds Speed: 15.760073 GB/s

Count: 20318230000 Elapsed: 0.662138 seconds Speed: 15.836215 GB/s

P.P.P.S. Finally, on "accepted answer" and other mistery ;-)

Let's use assp1r1n3's answer - he has 2.5Ghz core. POPCNT has 1 clock throuhgput, his code is using 64-bit popcnt. So math is 2.5Ghz * 1 clock * 8 bytes = 20 GB/s for his setup. He is seeing 25Gb/s, perhaps due to turbo boost to around 3Ghz.

Thus go to ark.intel.com and look for i7-4870HQ: https://ark.intel.com/products/83504/Intel-Core-i7-4870HQ-Processor-6M-Cache-up-to-3-70-GHz-?q=i7-4870HQ

That core could run up to 3.7Ghz and real maximal rate is 29.6 GB/s for his hardware. So where is another 4GB/s? Perhaps, it's spent on loop logic and other surrounding code within each iteration.

Now where is this false dependency? hardware runs at almost peak rate. Maybe my math is bad, it happens sometimes :)

P.P.P.P.P.S. Still people suggesting HW errata is culprit, so I follow suggestion and created inline asm example, see below.

On my 7960X, first version (with single output to cnt0) runs at 11MB/s, second version (with output to cnt0, cnt1, cnt2 and cnt3) runs at 33MB/s. And one could say - voila! it's output dependency.

OK, maybe, the point I made is that it does not make sense to write code like this and it's not output dependency problem but dumb code generation. We are not testing hardware, we are writing code to unleash maximal performance. You could expect that HW OOO should rename and hide those "output-dependencies" but, gash, just do the right things right and you will never face any mystery.

uint64_t builtin_popcnt1a(const uint64_t* buf, size_t len) 
{
    uint64_t cnt0, cnt1, cnt2, cnt3;
    cnt0 = cnt1 = cnt2 = cnt3 = 0;
    uint64_t val = buf[0];
    #if 0
        __asm__ __volatile__ (
            "1:\n\t"
            "popcnt %2, %1\n\t"
            "popcnt %2, %1\n\t"
            "popcnt %2, %1\n\t"
            "popcnt %2, %1\n\t"
            "subq $4, %0\n\t"
            "jnz 1b\n\t"
        : "+q" (len), "=q" (cnt0)
        : "q" (val)
        :
        );
    #else
        __asm__ __volatile__ (
            "1:\n\t"
            "popcnt %5, %1\n\t"
            "popcnt %5, %2\n\t"
            "popcnt %5, %3\n\t"
            "popcnt %5, %4\n\t"
            "subq $4, %0\n\t"
            "jnz 1b\n\t"
        : "+q" (len), "=q" (cnt0), "=q" (cnt1), "=q" (cnt2), "=q" (cnt3)
        : "q" (val)
        :
        );
    #endif
    return cnt0;
}

How to add images to README.md on GitHub?

I have solved this problem. You only need to refer to someone else's readme file.

At first,you should upload an image file to github code library ! Then direct reference to the address of the image file .

Programs & Examples On #Gant

How to add empty spaces into MD markdown readme on GitHub?

Smart cast to 'Type' is impossible, because 'variable' is a mutable property that could have been changed by this time

How to clear the logs properly for a Docker container?

how to display a javascript var in html body

@ViewChild in *ngIf

Deep copy in ES6 using the spread syntax

Index inside map() function

Array.prototype.map() index:

Other arguments of Array.prototype.map():

How do I pass data to Angular routed components?

better way to drop nan rows in pandas

Angular 2 - NgFor using numbers instead collections

How can I close a dropdown on click outside?

Call async/await functions in parallel

Comparing two arrays of objects, and exclude the elements who match values into new array in JS

UIAlertView first deprecated IOS 9

Python - Get Yesterday's date as a string in YYYY-MM-DD format

Elegant way to create empty pandas DataFrame with NaN of type float

Using lodash to compare jagged arrays (items existence without order)

React / JSX Dynamic Component Name

JSON to TypeScript class instance?

Slicing a dictionary

enum to string in modern C++11 / C++14 / C++17 and future C++20

Refreshing data in RecyclerView and keeping its scroll position

Multiple values in single-value context

Determining if Swift dictionary contains key and obtaining any of its values

Select subset of columns in data.table R

R Language: How to print the first or last rows of a data set?

python: get directory two levels up

dplyr change many data types

How to test if a string contains one of the substrings in a list, in pandas?

Appending to list in Python dictionary

How to mount host volumes into docker containers in Dockerfile during build

docker container ssl certificates

Remove all constraints affecting a UIView

Detect and exclude outliers in Pandas data frame

How do I run a spring boot executable jar in a Production environment?

how to check the dtype of a column in python pandas

Half circle with CSS (border, outline only)

Laravel update model with unique validation rule for attribute

pop/remove items out of a python tuple

Proper way to wait for one function to finish before continuing?

how to get the base url in javascript

bash string compare to multiple correct values

Changing route doesn't scroll to top in the new page

Rename multiple columns by names

Update dplyr 1.0.0

Side note:

Changing a specific column name in pandas DataFrame

Adjust plot title (main) position

How to read from stdin line by line in Node

Pandas get topmost n records within each group

add a string prefix to each value in a string column using Pandas

Hibernate: best practice to pull all lazy collections

Number of processors/cores in command line

From an array of objects, extract value of a property as array

Entity Framework 6 Code first Default value

How to Create Multiple Where Clause Query Using Laravel Eloquent?

subsetting a Python DataFrame

Twitter bootstrap 3 two columns full height

Spring CrudRepository findByInventoryIds(List<Long> inventoryIdList) - equivalent to IN clause

How to create a link for all mobile devices that opens google maps with a route starting at the current location, destinating a given place?

Print raw string from variable? (not getting the answers)

Efficiently checking if arbitrary object is NaN in Python / numpy / pandas?

Get the time difference between two datetimes

Multiplying across in a numpy array

Bootstrap 3 Collapse show state with Chevron icon

How to hide command output in Bash

SQL Server : Columns to Rows

SQL Query - SUM(CASE WHEN x THEN 1 ELSE 0) for multiple columns

for or while loop to do something n times

Replacing NULL and empty string within Select statement

How do I convert date/time from 24-hour format to 12-hour AM/PM?

Are nested try/except blocks in Python a good programming practice?

How to convert the time from AM/PM to 24 hour format in PHP?

How to send a “multipart/form-data” POST in Android with Volley

Bootstrap combining rows (rowspan)

Keep only date part when using pandas.to_datetime

How to check a channel is closed or not without reading it?

`Array.prototype.map()` index:

Other arguments of `Array.prototype.map()`: