Programs & Examples On #Dup

dup() is a c system call that duplicates a file descriptor

this in equals method

this is the current Object instance. Whenever you have a non-static method, it can only be called on an instance of your object.

Where do I put a single filter that filters methods in two controllers in Rails

Two ways.

i. You can put it in ApplicationController and add the filters in the controller

    class ApplicationController < ActionController::Base       def filter_method       end     end      class FirstController < ApplicationController       before_filter :filter_method     end      class SecondController < ApplicationController       before_filter :filter_method     end 

But the problem here is that this method will be added to all the controllers since all of them extend from application controller

ii. Create a parent controller and define it there

 class ParentController < ApplicationController   def filter_method   end  end  class FirstController < ParentController   before_filter :filter_method end  class SecondController < ParentController   before_filter :filter_method end 

I have named it as parent controller but you can come up with a name that fits your situation properly.

You can also define the filter method in a module and include it in the controllers where you need the filter

react hooks useEffect() cleanup for only componentWillUnmount?

Since the cleanup is not dependent on the username, you could put the cleanup in a separate useEffect that is given an empty array as second argument.

Example

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const { useState, useEffect } = React;_x000D_
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const ForExample = () => {_x000D_
  const [name, setName] = useState("");_x000D_
  const [username, setUsername] = useState("");_x000D_
_x000D_
  useEffect(_x000D_
    () => {_x000D_
      console.log("effect");_x000D_
    },_x000D_
    [username]_x000D_
  );_x000D_
_x000D_
  useEffect(() => {_x000D_
    return () => {_x000D_
      console.log("cleaned up");_x000D_
    };_x000D_
  }, []);_x000D_
_x000D_
  const handleName = e => {_x000D_
    const { value } = e.target;_x000D_
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    setName(value);_x000D_
  };_x000D_
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  const handleUsername = e => {_x000D_
    const { value } = e.target;_x000D_
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    setUsername(value);_x000D_
  };_x000D_
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  return (_x000D_
    <div>_x000D_
      <div>_x000D_
        <input value={name} onChange={handleName} />_x000D_
        <input value={username} onChange={handleUsername} />_x000D_
      </div>_x000D_
      <div>_x000D_
        <div>_x000D_
          <span>{name}</span>_x000D_
        </div>_x000D_
        <div>_x000D_
          <span>{username}</span>_x000D_
        </div>_x000D_
      </div>_x000D_
    </div>_x000D_
  );_x000D_
};_x000D_
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function App() {_x000D_
  const [shouldRender, setShouldRender] = useState(true);_x000D_
_x000D_
  useEffect(() => {_x000D_
    setTimeout(() => {_x000D_
      setShouldRender(false);_x000D_
    }, 5000);_x000D_
  }, []);_x000D_
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  return shouldRender ? <ForExample /> : null;_x000D_
}_x000D_
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ReactDOM.render(<App />, document.getElementById("root"));
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<script src="https://unpkg.com/react@16/umd/react.development.js"></script>_x000D_
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>_x000D_
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<div id="root"></div>
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How to use componentWillMount() in React Hooks?

I wrote a custom hook that will run a function once before first render.

useBeforeFirstRender.js

import { useState, useEffect } from 'react'

export default (fun) => {
  const [hasRendered, setHasRendered] = useState(false)

  useEffect(() => setHasRendered(true), [hasRendered])

  if (!hasRendered) {
    fun()
  }
}

Usage:

import React, { useEffect } from 'react'
import useBeforeFirstRender from '../hooks/useBeforeFirstRender'


export default () => { 
  useBeforeFirstRender(() => {
    console.log('Do stuff here')
  })

  return (
    <div>
      My component
    </div>
  )
}

How to compare oldValues and newValues on React Hooks useEffect?

Going off the accepted answer, an alternative solution that doesn't require a custom hook:

const Component = ({ receiveAmount, sendAmount }) => {
  const prevAmount = useRef({ receiveAmount, sendAmount }).current;
  useEffect(() => {
    if (prevAmount.receiveAmount !== receiveAmount) {
     // process here
    }
    if (prevAmount.sendAmount !== sendAmount) {
     // process here
    }
    return () => { 
      prevAmount.receiveAmount = receiveAmount;
      prevAmount.sendAmount = sendAmount;
    };
  }, [receiveAmount, sendAmount]);
};

This assumes you actually need reference to the previous values for anything in the "process here" bits. Otherwise unless your conditionals are beyond a straight !== comparison, the simplest solution here would just be:

const Component = ({ receiveAmount, sendAmount }) => {
  useEffect(() => {
     // process here
  }, [receiveAmount]);

  useEffect(() => {
     // process here
  }, [sendAmount]);
};

Python Pandas User Warning: Sorting because non-concatenation axis is not aligned

tl;dr:

concat and append currently sort the non-concatenation index (e.g. columns if you're adding rows) if the columns don't match. In pandas 0.23 this started generating a warning; pass the parameter sort=True to silence it. In the future the default will change to not sort, so it's best to specify either sort=True or False now, or better yet ensure that your non-concatenation indices match.


The warning is new in pandas 0.23.0:

In a future version of pandas pandas.concat() and DataFrame.append() will no longer sort the non-concatenation axis when it is not already aligned. The current behavior is the same as the previous (sorting), but now a warning is issued when sort is not specified and the non-concatenation axis is not aligned, link.

More information from linked very old github issue, comment by smcinerney :

When concat'ing DataFrames, the column names get alphanumerically sorted if there are any differences between them. If they're identical across DataFrames, they don't get sorted.

This sort is undocumented and unwanted. Certainly the default behavior should be no-sort.

After some time the parameter sort was implemented in pandas.concat and DataFrame.append:

sort : boolean, default None

Sort non-concatenation axis if it is not already aligned when join is 'outer'. The current default of sorting is deprecated and will change to not-sorting in a future version of pandas.

Explicitly pass sort=True to silence the warning and sort. Explicitly pass sort=False to silence the warning and not sort.

This has no effect when join='inner', which already preserves the order of the non-concatenation axis.

So if both DataFrames have the same columns in the same order, there is no warning and no sorting:

df1 = pd.DataFrame({"a": [1, 2], "b": [0, 8]}, columns=['a', 'b'])
df2 = pd.DataFrame({"a": [4, 5], "b": [7, 3]}, columns=['a', 'b'])

print (pd.concat([df1, df2]))
   a  b
0  1  0
1  2  8
0  4  7
1  5  3

df1 = pd.DataFrame({"a": [1, 2], "b": [0, 8]}, columns=['b', 'a'])
df2 = pd.DataFrame({"a": [4, 5], "b": [7, 3]}, columns=['b', 'a'])

print (pd.concat([df1, df2]))
   b  a
0  0  1
1  8  2
0  7  4
1  3  5

But if the DataFrames have different columns, or the same columns in a different order, pandas returns a warning if no parameter sort is explicitly set (sort=None is the default value):

df1 = pd.DataFrame({"a": [1, 2], "b": [0, 8]}, columns=['b', 'a'])
df2 = pd.DataFrame({"a": [4, 5], "b": [7, 3]}, columns=['a', 'b'])

print (pd.concat([df1, df2]))

FutureWarning: Sorting because non-concatenation axis is not aligned.

   a  b
0  1  0
1  2  8
0  4  7
1  5  3

print (pd.concat([df1, df2], sort=True))
   a  b
0  1  0
1  2  8
0  4  7
1  5  3

print (pd.concat([df1, df2], sort=False))
   b  a
0  0  1
1  8  2
0  7  4
1  3  5

If the DataFrames have different columns, but the first columns are aligned - they will be correctly assigned to each other (columns a and b from df1 with a and b from df2 in the example below) because they exist in both. For other columns that exist in one but not both DataFrames, missing values are created.

Lastly, if you pass sort=True, columns are sorted alphanumerically. If sort=False and the second DafaFrame has columns that are not in the first, they are appended to the end with no sorting:

df1 = pd.DataFrame({"a": [1, 2], "b": [0, 8], 'e':[5, 0]}, 
                    columns=['b', 'a','e'])
df2 = pd.DataFrame({"a": [4, 5], "b": [7, 3], 'c':[2, 8], 'd':[7, 0]}, 
                    columns=['c','b','a','d'])

print (pd.concat([df1, df2]))

FutureWarning: Sorting because non-concatenation axis is not aligned.

   a  b    c    d    e
0  1  0  NaN  NaN  5.0
1  2  8  NaN  NaN  0.0
0  4  7  2.0  7.0  NaN
1  5  3  8.0  0.0  NaN

print (pd.concat([df1, df2], sort=True))
   a  b    c    d    e
0  1  0  NaN  NaN  5.0
1  2  8  NaN  NaN  0.0
0  4  7  2.0  7.0  NaN
1  5  3  8.0  0.0  NaN

print (pd.concat([df1, df2], sort=False))

   b  a    e    c    d
0  0  1  5.0  NaN  NaN
1  8  2  0.0  NaN  NaN
0  7  4  NaN  2.0  7.0
1  3  5  NaN  8.0  0.0

In your code:

placement_by_video_summary = placement_by_video_summary.drop(placement_by_video_summary_new.index)
                                                       .append(placement_by_video_summary_new, sort=True)
                                                       .sort_index()

Checking for duplicate strings in JavaScript array

The following code uses a unique-filter (checks if every occurrence of an item is the first occurence) to compare the number of unique items in an array with the total number of items: if both are equal, the array only contains unique elements, otherwise there are some duplicates.

var firstUnique = (value, index, array) => array.indexOf(value) === index;
var numUnique = strArray.filter(firstUnique).length;
var allUnique = strArray.length === numUnique; 

ReactJS: Maximum update depth exceeded error

1.If we want to pass argument in the call then we need to call the method like below As we are using arrow functions no need to bind the method in cunstructor.

onClick={() => this.save(id)} 

when we bind the method in constructor like this

this.save= this.save.bind(this);

then we need to call the method without passing any argument like below

onClick={this.save}

and we try to pass argument while calling the function as shown below then error comes like maximum depth exceeded.

 onClick={this.save(id)}

React Native: JAVA_HOME is not set and no 'java' command could be found in your PATH

  1. Make sure you have java installed
  2. your path is wrong

do this:

    export | grep JAVA

THE RESULT: what java home is set to

JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home
  1. follow the path to see if the directories are correct

i did this in my terminal:

open /Library

then i went to /Java/JavaVirturalMachines turns out I had the wrong "jdk1.8.0_202.jdk" folder, there was another number... 4. you can use this command to set java_home

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home

Could not resolve com.android.support:appcompat-v7:26.1.0 in Android Studio new project

this work for me. add configurations.all in app/build.gradle

android {
    configurations.all {
        resolutionStrategy.force 'com.android.support:support-annotations:27.1.1'
    }
}

Detect if the device is iPhone X

Yes, it is possible. Download the UIDevice-Hardware extension (or install via CocoaPod 'UIDevice-Hardware') and then use:

NSString* modelID = [[[UIDevice currentDevice] modelIdentifier];
BOOL isIphoneX = [modelID isEqualToString:@"iPhone10,3"] || [modelID isEqualToString:@"iPhone10,6"];

Note that this won't work in the Simulator, only on the actual device.

Refused to load the font 'data:font/woff.....'it violates the following Content Security Policy directive: "default-src 'self'". Note that 'font-src'

In my case, I deleted src/registerServiceWorker file from create-react-app generated app. I added it and now it's all working.

No String-argument constructor/factory method to deserialize from String value ('')

Try setting mapper.configure(DeserializationConfig.Feature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true)

or

mapper.enable(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);

depending on your Jackson version.

Cannot find control with name: formControlName in angular reactive form

I tried to generate a form dynamically because the amount of questions depend on an object and for me the error was fixed when I added ngDefaultControl to my mat-form-field.

    <form [formGroup]="questionsForm">
        <ng-container *ngFor="let question of questions">
            <mat-form-field [formControlName]="question.id" ngDefaultControl>
                <mat-label>{{question.questionContent}}</mat-label>
                <textarea matInput rows="3" required></textarea>
            </mat-form-field>
        </ng-container>
        <button mat-raised-button (click)="sendFeedback()">Submit all questions</button>
    </form>

In sendFeedback() I get the value from my dynamic form by selecting the formgroup's value as such

  sendFeedbackAsAgent():void {
    if (this.questionsForm.valid) {
      console.log(this.questionsForm.value)
    }
  }

Val and Var in Kotlin

Lets try this way.

Val is a Immutable constant 
    val change="Unchange" println(change)
    //It will throw error because val is constant variable
    // change="Change" 
    // println(change)
Var is a Mutable constant
    var name: String="Dummy"
    println(name)
    name="Funny"
    println(name)

How to import functions from different js file in a Vue+webpack+vue-loader project

Say I want to import data into a component from src/mylib.js:

var test = {
  foo () { console.log('foo') },
  bar () { console.log('bar') },
  baz () { console.log('baz') }
}

export default test

In my .Vue file I simply imported test from src/mylib.js:

<script> 
  import test from '@/mylib'

  console.log(test.foo())
  ...
</script>

Error: the entity type requires a primary key

Your Id property needs to have a setter. However the setter can be private. The [Key] attribute is not necessary if the property is named "Id" as it will find it through the naming convention where it looks for a key with the name "Id".

public Guid Id { get; }              // Will not work
public Guid Id { get; set; }         // Will work
public Guid Id { get; private set; } // Will also work

Seaborn Barplot - Displaying Values

Works with single ax or with matrix of ax (subplots)

from matplotlib import pyplot as plt
import numpy as np

def show_values_on_bars(axs):
    def _show_on_single_plot(ax):        
        for p in ax.patches:
            _x = p.get_x() + p.get_width() / 2
            _y = p.get_y() + p.get_height()
            value = '{:.2f}'.format(p.get_height())
            ax.text(_x, _y, value, ha="center") 

    if isinstance(axs, np.ndarray):
        for idx, ax in np.ndenumerate(axs):
            _show_on_single_plot(ax)
    else:
        _show_on_single_plot(axs)

fig, ax = plt.subplots(1, 2)
show_values_on_bars(ax)

ValueError: Wrong number of items passed - Meaning and suggestions?

for i in range(100):
try:
  #Your code here
  break
except:
  continue

This one worked for me.

How to post raw body data with curl?

curl's --data will by default send Content-Type: application/x-www-form-urlencoded in the request header. However, when using Postman's raw body mode, Postman sends Content-Type: text/plain in the request header.

So to achieve the same thing as Postman, specify -H "Content-Type: text/plain" for curl:

curl -X POST -H "Content-Type: text/plain" --data "this is raw data" http://78.41.xx.xx:7778/

Note that if you want to watch the full request sent by Postman, you can enable debugging for packed app. Check this link for all instructions. Then you can inspect the app (right-click in Postman) and view all requests sent from Postman in the network tab :

enter image description here

How to install pip for Python 3.6 on Ubuntu 16.10?

Let's suppose that you have a system running Ubuntu 16.04, 16.10, or 17.04, and you want Python 3.6 to be the default Python.

If you're using Ubuntu 16.04 LTS, you'll need to use a PPA:

sudo add-apt-repository ppa:jonathonf/python-3.6  # (only for 16.04 LTS)

Then, run the following (this works out-of-the-box on 16.10 and 17.04):

sudo apt update
sudo apt install python3.6
sudo apt install python3.6-dev
sudo apt install python3.6-venv
wget https://bootstrap.pypa.io/get-pip.py
sudo python3.6 get-pip.py
sudo ln -s /usr/bin/python3.6 /usr/local/bin/python3
sudo ln -s /usr/local/bin/pip /usr/local/bin/pip3

# Do this only if you want python3 to be the default Python
# instead of python2 (may be dangerous, esp. before 2020):
# sudo ln -s /usr/bin/python3.6 /usr/local/bin/python

When you have completed all of the above, each of the following shell commands should indicate Python 3.6.1 (or a more recent version of Python 3.6):

python --version   # (this will reflect your choice, see above)
python3 --version
$(head -1 `which pip` | tail -c +3) --version
$(head -1 `which pip3` | tail -c +3) --version

How can I serve static html from spring boot?

Static files should be served from resources, not from controller.

Spring Boot will automatically add static web resources located within any of the following directories:

/META-INF/resources/  
/resources/  
/static/  
/public/

refs:
https://spring.io/blog/2013/12/19/serving-static-web-content-with-spring-boot
https://spring.io/guides/gs/serving-web-content/

Importing class from another file

Your problem is basically that you never specified the right path to the file.

Try instead, from your main script:

from folder.file import Klasa

Or, with from folder import file:

from folder import file
k = file.Klasa()

Or again:

import folder.file as myModule
k = myModule.Klasa()

Nuget connection attempt failed "Unable to load the service index for source"

In my case, I just restarted the docker and just worked.

The model item passed into the dictionary is of type .. but this dictionary requires a model item of type

This question already has a great answer, but I ran into the same error, in a different scenario: displaying a List in an EditorTemplate.

I have a model like this:

public class Foo
{
    public string FooName { get; set; }
    public List<Bar> Bars { get; set; }
}

public class Bar
{
    public string BarName { get; set; }
}

And this is my main view:

@model Foo

@Html.TextBoxFor(m => m.Name, new { @class = "form-control" })  
@Html.EditorFor(m => m.Bars)

And this is my Bar EditorTemplate (Bar.cshtml)

@model List<Bar>

<div class="some-style">
    @foreach (var item in Model)
    {
        <label>@item.BarName</label>
    }
</div>

And I got this error:

The model item passed into the dictionary is of type 'Bar', but this dictionary requires a model item of type 'System.Collections.Generic.List`1[Bar]


The reason for this error is that EditorFor already iterates the List for you, so if you pass a collection to it, it would display the editor template once for each item in the collection.

This is how I fixed this problem:

Brought the styles outside of the editor template, and into the main view:

@model Foo

@Html.TextBoxFor(m => m.Name, new { @class = "form-control" })  
<div class="some-style">
    @Html.EditorFor(m => m.Bars)
</div>

And changed the EditorTemplate (Bar.cshtml) to this:

@model Bar

<label>@Model.BarName</label>

Linker command failed with exit code 1 - duplicate symbol __TMRbBp

In my case

  1. Select your project (In my case i have 2 targets)
  2. Go to Build Phases
  3. Compile Sources
  4. Check if the number of items on each targets is the same (mine was different)
  5. Add the missing file / Remove the duplicated file

Problem Solved

Reload child component when variables on parent component changes. Angular2

In case, when we have no control over child component, like a 3rd party library component.

We can use *ngIf and setTimeout to reset the child component from parent without making any change in child component.

.template:

.ts:

show:boolean = true

resetChildForm(){
   this.show = false;

   setTimeout(() => {
      this.show = true
    }, 100);
}

Postgres: check if array field contains value?

This worked for me

let exampleArray = [1, 2, 3, 4, 5];
let exampleToString = exampleArray.toString(); //convert to toString
let query = `Select * from table_name where column_name in (${exampleToString})`; //Execute the query to get response

I have got the same problem, then after an hour of effort I got to know that the array should not be directly accessed in the query. So I then found that the data should be sent in the paranthesis it self, then again I have converted that array to string using toString method in js. So I have worked by executing the above query and got my expected result

Moment js get first and last day of current month

I ran into some issues because I wasn't aware that moment().endOf() mutates the input date, so I used this work around.

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let thisMoment = moment();
let endOfMonth = moment(thisMoment).endOf('month');
let startOfMonth = moment(thisMoment).startOf('month');
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_x000D_
_x000D_

Angular2 RC5: Can't bind to 'Property X' since it isn't a known property of 'Child Component'

<create-report-card-form [currentReportCardCount]="providerData.reportCards.length" ...
                         ^^^^^^^^^^^^^^^^^^^^^^^^

In your HomeComponent template, you are trying to bind to an input on the CreateReportCardForm component that doesn't exist.

In CreateReportCardForm, these are your only three inputs:

@Input() public reportCardDataSourcesItems: SelectItem[];
@Input() public reportCardYearItems: SelectItem[];
@Input() errorMessages: Message[];

Add one for currentReportCardCount and you should be good to go.

What is (x & 1) and (x >>= 1)?

In addition to the answer of "dasblinkenlight" I think an example could help. I will only use 8 bits for a better understanding.

x & 1 produces a value that is either 1 or 0, depending on the least significant bit of x: if the last bit is 1, the result of x & 1 is 1; otherwise, it is 0. This is a bitwise AND operation.

This is because 1 will be represented in bits as 00000001. Only the last bit is set to 1. Let's assume x is 185 which will be represented in bits as 10111001. If you apply a bitwise AND operation on x with 1 this will be the result:

00000001
10111001
--------
00000001

The first seven bits of the operation result will be 0 after the operation and will carry no information in this case (see Logical AND operation). Because whatever the first seven bits of the operand x were before, after the operation they will be 0. But the last bit of the operand 1 is 1 and it will reveal if the last bit of operand x was 0 or 1. So in this example the result of the bitwise AND operation will be 1 because our last bit of x is 1. If the last bit would have been 0, then the result would have been also 0, indicating that the last bit of operand x is 0:

00000001
10111000
--------
00000000

x >>= 1 means "set x to itself shifted by one bit to the right". The expression evaluates to the new value of x after the shift

Let's pick the example from above. For x >>= 1 this would be:

10111001
--------
01011100

And for left shift x <<= 1 it would be:

10111001
--------
01110010

Please pay attention to the note of user "dasblinkenlight" in regard to shifts.

Make the size of a heatmap bigger with seaborn

I do not know how to solve this using code, but I do manually adjust the control panel at the right bottom in the plot figure, and adjust the figure size like:

f, ax = plt.subplots(figsize=(16, 12))

at the meantime until you get a matched size colobar. This worked for me.

ValueError: all the input arrays must have same number of dimensions

The reason why you get your error is because a "1 by n" matrix is different from an array of length n.

I recommend using hstack() and vstack() instead. Like this:

import numpy as np
a = np.arange(32).reshape(4,8) # 4 rows 8 columns matrix.
b = a[:,-1:]                    # last column of that matrix.

result = np.hstack((a,b))       # stack them horizontally like this:
#array([[ 0,  1,  2,  3,  4,  5,  6,  7,  7],
#       [ 8,  9, 10, 11, 12, 13, 14, 15, 15],
#       [16, 17, 18, 19, 20, 21, 22, 23, 23],
#       [24, 25, 26, 27, 28, 29, 30, 31, 31]])

Notice the repeated "7, 15, 23, 31" column. Also, notice that I used a[:,-1:] instead of a[:,-1]. My version generates a column:

array([[7],
       [15],
       [23],
       [31]])

Instead of a row array([7,15,23,31])


Edit: append() is much slower. Read this answer.

When to use React "componentDidUpdate" method?

This lifecycle method is invoked as soon as the updating happens. The most common use case for the componentDidUpdate() method is updating the DOM in response to prop or state changes.

You can call setState() in this lifecycle, but keep in mind that you will need to wrap it in a condition to check for state or prop changes from previous state. Incorrect usage of setState() can lead to an infinite loop. Take a look at the example below that shows a typical usage example of this lifecycle method.

componentDidUpdate(prevProps) {
 //Typical usage, don't forget to compare the props
 if (this.props.userName !== prevProps.userName) {
   this.fetchData(this.props.userName);
 }
}

Notice in the above example that we are comparing the current props to the previous props. This is to check if there has been a change in props from what it currently is. In this case, there won’t be a need to make the API call if the props did not change.

For more info, refer to the official docs:

Duplicate line in Visual Studio Code

Click File > Preferences > Keyboard Shortcuts:

enter image description here

Search for copyLinesDownAction or copyLinesUpAction in your keyboard shortcuts

Usually it is SHIFT+ALT + ?


Update for Ubuntu:

It seems that Ubuntu is hiding that shortcut from being seen by VSCode (i.e. it uses it probably by its own). There is an issue about that on GitHub.

In order to work in Ubuntu you will have to define your own shortcut, e.g. to copy the line using ctrl+shift+alt+j and CTRL +SHIFT + ALT + k you could use a keybindings.json like this:

[
    { "key": "ctrl+shift+alt+j", "command": "editor.action.copyLinesDownAction",
                                    "when": "editorTextFocus && !editorReadonly" },
    { "key": "ctrl+shift+alt+k", "command": "editor.action.copyLinesUpAction",
                                    "when": "editorTextFocus && !editorReadonly" }
]

"Please provide a valid cache path" error in laravel

If this happens on server:

sudo mkdir logs framework framework/cache framework/sessions framework/views
sudo chgrp -R www-data storage
sudo chmod -R ug+rwx storage

Getting "Cannot call a class as a function" in my React Project

For me it was because I forgot to use the new keyword when setting up Animated state.

eg:

fadeAnim: Animated.Value(0),

to

fadeAnim: new Animated.Value(0),

would fix it.

How do you send a Firebase Notification to all devices via CURL?

EDIT: It appears that this method is not supported anymore (thx to @FernandoZamperin). Please take a look at the other answers!

Instead of subscribing to a topic you could instead make use of the condition key and send messages to instances, that are not in a group. Your data might look something like this:

{
    "data": {
        "foo": "bar"
    },
    "condition": "!('anytopicyoudontwanttouse' in topics)"
}

See https://firebase.google.com/docs/cloud-messaging/send-message#send_messages_to_topics_2

How to install and run Typescript locally in npm?

tsc requires a config file or .ts(x) files to compile.

To solve both of your issues, create a file called tsconfig.json with the following contents:

{
    "compilerOptions": {
        "outFile": "../../built/local/tsc.js"
    },
    "exclude": [
        "node_modules"
    ]
}

Also, modify your npm run with this

tsc --config /path/to/a/tsconfig.json

<img>: Unsafe value used in a resource URL context

I usually add separate safe pipe reusable component as following

# Add Safe Pipe

import { Pipe, PipeTransform } from '@angular/core';
import { DomSanitizer } from '@angular/platform-browser';

@Pipe({name: 'mySafe'})
export class SafePipe implements PipeTransform {
    constructor(private sanitizer: DomSanitizer) {
    }

    public transform(url) {
        return this.sanitizer.bypassSecurityTrustResourceUrl(url);
    }
}
# then create shared pipe module as following 

import { NgModule } from '@angular/core'; 
import { SafePipe } from './safe.pipe';
@NgModule({
    declarations: [
        SafePipe
    ],
    exports: [
        SafePipe
    ]
})
export class SharedPipesModule {
}
# import shared pipe module in your native module

@NgModule({
    declarations: [],
    imports: [
        SharedPipesModule,
    ],
})
export class SupportModule {
}
<!-------------------
call your url (`trustedUrl` for me) and add `mySafe` as defined in Safe Pipe
---------------->
<div class="container-fluid" *ngIf="trustedUrl">
    <iframe [src]="trustedUrl | mySafe" align="middle" width="100%" height="800" frameborder="0"></iframe>
</div>

React.js, wait for setState to finish before triggering a function?

Why not one more answer? setState() and the setState()-triggered render() have both completed executing when you call componentDidMount() (the first time render() is executed) and/or componentDidUpdate() (any time after render() is executed). (Links are to ReactJS.org docs.)

Example with componentDidUpdate()

Caller, set reference and set state...

<Cmp ref={(inst) => {this.parent=inst}}>;
this.parent.setState({'data':'hello!'});

Render parent...

componentDidMount() {           // componentDidMount() gets called after first state set
    console.log(this.state.data);   // output: "hello!"
}
componentDidUpdate() {          // componentDidUpdate() gets called after all other states set
    console.log(this.state.data);   // output: "hello!"
}

Example with componentDidMount()

Caller, set reference and set state...

<Cmp ref={(inst) => {this.parent=inst}}>
this.parent.setState({'data':'hello!'});

Render parent...

render() {              // render() gets called anytime setState() is called
    return (
        <ChildComponent
            state={this.state}
        />
    );
}

After parent rerenders child, see state in componentDidUpdate().

componentDidMount() {           // componentDidMount() gets called anytime setState()/render() finish
console.log(this.props.state.data); // output: "hello!"
}

JPA Hibernate Persistence exception [PersistenceUnit: default] Unable to build Hibernate SessionFactory

I found some issue about that kind of error

  1. Database username or password not match in the mysql or other other database. Please set application.properties like this

  

# =============================== # = DATA SOURCE # =============================== # Set here configurations for the database connection # Connection url for the database please let me know "[email protected]" spring.datasource.url = jdbc:mysql://localhost:3306/bookstoreapiabc # Username and secret spring.datasource.username = root spring.datasource.password = # Keep the connection alive if idle for a long time (needed in production) spring.datasource.testWhileIdle = true spring.datasource.validationQuery = SELECT 1 # =============================== # = JPA / HIBERNATE # =============================== # Use spring.jpa.properties.* for Hibernate native properties (the prefix is # stripped before adding them to the entity manager). # Show or not log for each sql query spring.jpa.show-sql = true # Hibernate ddl auto (create, create-drop, update): with "update" the database # schema will be automatically updated accordingly to java entities found in # the project spring.jpa.hibernate.ddl-auto = update # Allows Hibernate to generate SQL optimized for a particular DBMS spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

Issue no 2.

Your local server has two database server and those database server conflict. this conflict like this mysql server & xampp or lampp or wamp server. Please one of the database like mysql server because xampp or lampp server automatically install mysql server on this machine

React.js: Set innerHTML vs dangerouslySetInnerHTML

You can bind to dom directly

<div dangerouslySetInnerHTML={{__html: '<p>First &middot; Second</p>'}}></div>

#1292 - Incorrect date value: '0000-00-00'

The error is because of the sql mode which can be strict mode as per latest MYSQL 5.7 documentation.

For more information read this.

Hope it helps.

Add jars to a Spark Job - spark-submit

Another approach in spark 2.1.0 is to use --conf spark.driver.userClassPathFirst=true during spark-submit which changes the priority of dependency load, and thus the behavior of the spark-job, by giving priority to the jars the user is adding to the class-path with the --jars option.

How to generate range of numbers from 0 to n in ES2015 only?

How about just mapping ....

Array(n).map((value, index) ....) is 80% of the way there. But for some odd reason it does not work. But there is a workaround.

Array(n).map((v,i) => i) // does not work
Array(n).fill().map((v,i) => i) // does dork

For a range

Array(end-start+1).fill().map((v,i) => i + start) // gives you a range

Odd, these two iterators return the same result: Array(end-start+1).entries() and Array(end-start+1).fill().entries()

Copy multiple files with Ansible

- name: Your copy task
  copy: src={{ item.src }} dest={{ item.dest }}
  with_items:
    - { src: 'containerizers', dest: '/etc/mesos/containerizers' }
    - { src: 'another_file', dest: '/etc/somewhere' }
    - { src: 'dynamic', dest: '{{ var_path }}' }
  # more files here

SQL query to check if a name begins and ends with a vowel

you can also do a hard code like this, where you are checking each and every case possible, it's easy to understand for beginners

SELECT DISTINCT CITY 
FROM STATION
WHERE CITY LIKE 'A%A' OR CITY LIKE 'E%E' OR CITY LIKE 'I%I' OR CITY LIKE 'O%O' OR
CITY LIKE 'U%U' OR CITY LIKE 'A%E' OR CITY LIKE 'A%I' OR CITY LIKE 'A%O' OR 
CITY LIKE 'A%U' OR CITY LIKE 'E%A' OR CITY LIKE 'E%I' OR CITY LIKE 'E%O' OR 
CITY LIKE 'E%U' OR CITY LIKE 'I%A' OR CITY LIKE 'I%E' OR CITY LIKE 'I%O' OR 
CITY LIKE 'I%U' OR CITY LIKE 'O%A' OR CITY LIKE 'O%E' OR CITY LIKE 'O%I' OR 
CITY LIKE 'O%U' OR CITY LIKE 'U%A' OR CITY LIKE 'U%E' OR CITY LIKE 'U%I' OR 
CITY LIKE 'U%O'

How to convert an Image to base64 string in java?

The problem is that you are returning the toString() of the call to Base64.encodeBase64(bytes) which returns a byte array. So what you get in the end is the default string representation of a byte array, which corresponds to the output you get.

Instead, you should do:

encodedfile = new String(Base64.encodeBase64(bytes), "UTF-8");

Removing black dots from li and ul

Relatable post

Those pesky black dots you are referencing to are called bullets.

They are pretty simple to remove, just add this line to your css:

ul {
    list-style-type: none;
}

Hope this helps

Invariant Violation: Could not find "store" in either the context or props of "Connect(SportsDatabase)"

For me it was import issue, hope it helps. default import by WebStorm was wrong.

replace

import connect from "react-redux/lib/connect/connect";

with

import {connect} from "react-redux";

ImportError: No module named 'google'

I had a similar import problem. I noticed that there was no __init__.py file in the root of the google package. So, I created an empty __init__.py and now the import works.

Angular 2: How to write a for loop, not a foreach loop

You can simply do :-

{{"<li>Something</li>".repeat(5)}}

Violation of PRIMARY KEY constraint. Cannot insert duplicate key in object

To prevent inserting a record that exist already. I'd check if the ID value exists in the database. For the example of a Table created with an IDENTITY PRIMARY KEY:

CREATE TABLE [dbo].[Persons] (    
    ID INT IDENTITY(1,1) PRIMARY KEY,
    LastName VARCHAR(40) NOT NULL,
    FirstName VARCHAR(40)
);

When JANE DOE and JOE BROWN already exist in the database.

SET IDENTITY_INSERT [dbo].[Persons] OFF;
INSERT INTO [dbo].[Persons] (FirstName,LastName)
VALUES ('JANE','DOE'); 
INSERT INTO Persons (FirstName,LastName) 
VALUES ('JOE','BROWN');

DATABASE OUTPUT of TABLE [dbo].[Persons] will be:

ID    LastName   FirstName
1     DOE        Jane
2     BROWN      JOE

I'd check if i should update an existing record or insert a new one. As the following JAVA example:

int NewID = 1;
boolean IdAlreadyExist = false;
// Using SQL database connection
// STEP 1: Set property
System.setProperty("java.net.preferIPv4Stack", "true");
// STEP 2: Register JDBC driver
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
// STEP 3: Open a connection
try (Connection conn1 = DriverManager.getConnection(DB_URL, USER,pwd) {
    conn1.setAutoCommit(true);
    String Select = "select * from Persons where  ID = " + ID;
    Statement st1 = conn1.createStatement();
    ResultSet rs1 = st1.executeQuery(Select);
    // iterate through the java resultset
    while (rs1.next()) {
        int ID = rs1.getInt("ID");
        if (NewID==ID) {
            IdAlreadyExist = true;
        }

    }
    conn1.close();
} catch (SQLException e1) {
    System.out.println(e1);
}
if (IdAlreadyExist==false) {
    //Insert new record code here
} else {
    //Update existing record code here
}

How to count duplicate rows in pandas dataframe?

df.groupby(df.columns.tolist()).size().reset_index().\
    rename(columns={0:'records'})

   one  two  records
0    1    1        2
1    1    2        1

MySQL Incorrect datetime value: '0000-00-00 00:00:00'

SET sql_mode = 'NO_ZERO_DATE';
UPDATE `news` SET `d_stop`='2038-01-01 00:00:00' WHERE `d_stop`='0000-00-00 00:00:00'

Deep copy an array in Angular 2 + TypeScript

Here is my own. Doesn't work for complex cases, but for a simple array of Objects, it's good enough.

  deepClone(oldArray: Object[]) {
    let newArray: any = [];
    oldArray.forEach((item) => {
      newArray.push(Object.assign({}, item));
    });
    return newArray;
  }

How to check type of object in Python?

use isinstance(v, type_name) or type(v) is type_name or type(v) == type_name,

where type_name can be one of the following:

  • None
  • bool
  • int
  • float
  • complex
  • str
  • list
  • tuple
  • set
  • dict

and, of course,

  • custom types (classes)

Find duplicates and delete all in notepad++

You need the textFX plugin. Then, just follow these instructions:

Paste the text into Notepad++ (CTRL+V). ...
Mark all the text (CTRL+A). ...
Click TextFX ? Click TextFX Tools ? Click Sort lines case insensitive (at column)
Duplicates and blank lines have been removed and the data has been sorted alphabetically.

Personally, I would use sort -i -u source >dest instead of notepad++

In python, how do I cast a class object to a dict

something like this would probably work

class MyClass:
    def __init__(self,x,y,z):
       self.x = x
       self.y = y
       self.z = z
    def __iter__(self): #overridding this to return tuples of (key,value)
       return iter([('x',self.x),('y',self.y),('z',self.z)])

dict(MyClass(5,6,7)) # because dict knows how to deal with tuples of (key,value)

How to filter an array from all elements of another array

with object filter result

[{id:1},{id:2},{id:3},{id:4}].filter(v=>!([{id:2},{id:4}].some(e=>e.id === v.id)))

enter image description here

How to resolve the "EVP_DecryptFInal_ex: bad decrypt" during file decryption

This message digital envelope routines: EVP_DecryptFInal_ex: bad decrypt can also occur when you encrypt and decrypt with an incompatible versions of openssl.

The issue I was having was that I was encrypting on Windows which had version 1.1.0 and then decrypting on a generic Linux system which had 1.0.2g.

It is not a very helpful error message!


Working solution:

A possible solution from @AndrewSavinykh that worked for many (see the comments):

Default digest has changed between those versions from md5 to sha256. One can specify the default digest on the command line as -md sha256 or -md md5 respectively

How to prevent tensorflow from allocating the totality of a GPU memory?

For TensorFlow 2.0 and 2.1 (docs):

import tensorflow as tf
tf.config.gpu.set_per_process_memory_growth(True)

For TensorFlow 2.2+ (docs):

import tensorflow as tf
gpus = tf.config.experimental.list_physical_devices('GPU')
for gpu in gpus:
  tf.config.experimental.set_memory_growth(gpu, True)

The docs also list some more methods:

  • Set environment variable TF_FORCE_GPU_ALLOW_GROWTH to true.
  • Use tf.config.experimental.set_virtual_device_configuration to set a hard limit on a Virtual GPU device.

Pass Model To Controller using Jquery/Ajax

Looks like your IndexPartial action method has an argument which is a complex object. If you are passing a a lot of data (complex object), It might be a good idea to convert your action method to a HttpPost action method and use jQuery post to post data to that. GET has limitation on the query string value.

[HttpPost]
public PartialViewResult IndexPartial(DashboardViewModel m)
{
   //May be you want to pass the posted model to the parial view?
   return PartialView("_IndexPartial");
}

Your script should be

var url = "@Url.Action("IndexPartial","YourControllerName")";

var model = { Name :"Shyju", Location:"Detroit"};

$.post(url, model, function(res){
   //res contains the markup returned by the partial view
   //You probably want to set that to some Div.
   $("#SomeDivToShowTheResult").html(res);
});

Assuming Name and Location are properties of your DashboardViewModel class and SomeDivToShowTheResult is the id of a div in your page where you want to load the content coming from the partialview.

Sending complex objects?

You can build more complex object in js if you want. Model binding will work as long as your structure matches with the viewmodel class

var model = { Name :"Shyju", 
              Location:"Detroit", 
              Interests : ["Code","Coffee","Stackoverflow"]
            };

$.ajax({
    type: "POST",
    data: JSON.stringify(model),
    url: url,
    contentType: "application/json"
}).done(function (res) {
    $("#SomeDivToShowTheResult").html(res);
});

For the above js model to be transformed to your method parameter, Your View Model should be like this.

public class DashboardViewModel
{
  public string Name {set;get;}
  public string Location {set;get;}
  public List<string> Interests {set;get;}
}

And in your action method, specify [FromBody]

[HttpPost]
public PartialViewResult IndexPartial([FromBody] DashboardViewModel m)
{
    return PartialView("_IndexPartial",m);
}

Spark Dataframe distinguish columns with duplicated name

I would recommend that you change the column names for your join.

df1.select(col("a") as "df1_a", col("f") as "df1_f")
   .join(df2.select(col("a") as "df2_a", col("f") as "df2_f"), col("df1_a" === col("df2_a"))

The resulting DataFrame will have schema

(df1_a, df1_f, df2_a, df2_f)

How do I force Maven to use my local repository rather than going out to remote repos to retrieve artifacts?

The -o option didn't work for me because the artifact is still in development and not yet uploaded and maven (3.5.x) still tries to download it from the remote repository because it's the first time, according to the error I get.

However this fixed it for me: https://maven.apache.org/general.html#importing-jars

After this manual install there's no need to use the offline option either.

UPDATE

I've just rebuilt the dependency and I had to re-import it: the regular mvn clean install was not sufficient for me

Error:Execution failed for task ':app:transformClassesWithJarMergingForDebug'

I got this error because I did not have the correct line in my build.gradle. I am using the org.apache.http.legacy.jar library, which requires this:

android{
   useLibrary 'org.apache.http.legacy'

   ...
}

So check that you have everything in your gradle file that is required.

How to Use Multiple Columns in Partition By And Ensure No Duplicate Row is Returned

I'd create a cte and do an inner join. It's not efficient but it's convenient

with table as (
SELECT DATE, STATUS, TITLE, ROW_NUMBER() 
OVER (PARTITION BY DATE, STATUS,  TITLE ORDER BY QUANTITY ASC) AS Row_Num
 FROM TABLE)

select *

from table t
join select(
max(Row_Num) as Row_Num
,DATE
,STATUS
,TITLE
from table 
group by date, status, title) t2  
on t2.Row_Num = t.Row_Num and t2
and t2.date = t.date
and t2.title = t.title

Mongoose: findOneAndUpdate doesn't return updated document

Mongoose maintainer here. You need to set the new option to true (or, equivalently, returnOriginal to false)

await User.findOneAndUpdate(filter, update, { new: true });

// Equivalent
await User.findOneAndUpdate(filter, update, { returnOriginal: false });

See Mongoose findOneAndUpdate() docs and this tutorial on updating documents in Mongoose.

Get div's offsetTop positions in React

A better solution with ref to avoid findDOMNode that is discouraged.

...
onScroll() {
    let offsetTop  = this.instance.getBoundingClientRect().top;
}
...
render() {
...
<Component ref={(el) => this.instance = el } />
...

Ignore duplicates when producing map using streams

The @alaster answer help me a lot, but I would like to add a meaninful information if someone is trying to group the information.

If you have, per example, two Orders with the same code but different quantity of products for each one, and your desire is sum the quantities, you can do:

List<Order> listQuantidade = new ArrayList<>();
listOrders.add(new Order("COD_1", 1L));
listOrders.add(new Order("COD_1", 5L));
listOrders.add(new Order("COD_1", 3L));
listOrders.add(new Order("COD_2", 3L));
listOrders.add(new Order("COD_3", 4L));

listOrders.collect(Collectors.toMap(Order::getCode, 
                                    o -> o.getQuantity(), 
                                    (o1, o2) -> o1 + o2));

Result:

{COD_3=4, COD_2=3, COD_1=9}

Remove duplicates from dataframe, based on two columns A,B, keeping row with max value in another column C

You can do this simply by using pandas drop duplicates function

df.drop_duplicates(['A','B'],keep= 'last')

How can I detect Internet Explorer (IE) and Microsoft Edge using JavaScript?

Topic is a bit old, but since the scripts here detect Firefox as a False Positive (EDGE v12), here is the version I use:

function isIEorEDGE(){
  if (navigator.appName == 'Microsoft Internet Explorer'){
    return true; // IE
  }
  else if(navigator.appName == "Netscape"){                       
     return navigator.userAgent.indexOf('.NET') > -1; // Only Edge uses .NET libraries
  }       

  return false;
}

which of course can be written in a more concise way:

function isIEorEDGE(){
  return navigator.appName == 'Microsoft Internet Explorer' || (navigator.appName == "Netscape" && navigator.userAgent.indexOf('.NET') > -1);
}

Lodash remove duplicates from array

With lodash version 4+, you would remove duplicate objects either by specific property or by the entire object like so:

var users = [
  {id:1,name:'ted'},
  {id:1,name:'ted'},
  {id:1,name:'bob'},
  {id:3,name:'sara'}
];
var uniqueUsersByID = _.uniqBy(users,'id'); //removed if had duplicate id
var uniqueUsers = _.uniqWith(users, _.isEqual);//removed complete duplicates

Source:https://www.codegrepper.com/?search_term=Lodash+remove+duplicates+from+array

Remove Duplicates from range of cells in excel vba

You need to tell the Range.RemoveDuplicates method what column to use. Additionally, since you have expressed that you have a header row, you should tell the .RemoveDuplicates method that.

Sub dedupe_abcd()
    Dim icol As Long

    With Sheets("Sheet1")   '<-set this worksheet reference properly!
        icol = Application.Match("abcd", .Rows(1), 0)
        With .Cells(1, 1).CurrentRegion
            .RemoveDuplicates Columns:=icol, Header:=xlYes
        End With
    End With
End Sub

Your original code seemed to want to remove duplicates from a single column while ignoring surrounding data. That scenario is atypical and I've included the surrounding data so that the .RemoveDuplicates process does not scramble your data. Post back a comment if you truly wanted to isolate the RemoveDuplicates process to a single column.

Casting int to bool in C/C++

0 values of basic types (1)(2)map to false.

Other values map to true.

This convention was established in original C, via its flow control statements; C didn't have a boolean type at the time.


It's a common error to assume that as function return values, false indicates failure. But in particular from main it's false that indicates success. I've seen this done wrong many times, including in the Windows starter code for the D language (when you have folks like Walter Bright and Andrei Alexandrescu getting it wrong, then it's just dang easy to get wrong), hence this heads-up beware beware.


There's no need to cast to bool for built-in types because that conversion is implicit. However, Visual C++ (Microsoft's C++ compiler) has a tendency to issue a performance warning (!) for this, a pure silly-warning. A cast doesn't suffice to shut it up, but a conversion via double negation, i.e. return !!x, works nicely. One can read !! as a “convert to bool” operator, much as --> can be read as “goes to”. For those who are deeply into readability of operator notation. ;-)


1) C++14 §4.12/1 “A zero value, null pointer value, or null member pointer value is converted to false; any other value is converted to true. For direct-initialization (8.5), a prvalue of type std::nullptr_t can be converted to a prvalue of type bool; the resulting value is false.”
2) C99 and C11 §6.3.1.2/1 “When any scalar value is converted to _Bool, the result is 0 if the value compares equal to 0; otherwise, the result is 1.”

Confusing "duplicate identifier" Typescript error message

Closing the solution completely and rerunning the project solved my issue.

Remove duplicates from a dataframe in PySpark

It is not an import problem. You simply call .dropDuplicates() on a wrong object. While class of sqlContext.createDataFrame(rdd1, ...) is pyspark.sql.dataframe.DataFrame, after you apply .collect() it is a plain Python list, and lists don't provide dropDuplicates method. What you want is something like this:

 (df1 = sqlContext
     .createDataFrame(rdd1, ['column1', 'column2', 'column3', 'column4'])
     .dropDuplicates())

 df1.collect()

Difference between request.getSession() and request.getSession(true)

request.getSession() will return a current session. if current session does not exist, then it will create a new one.

request.getSession(true) will return current session. If current session does not exist, then it will create a new session.

So basically there is not difference between both method.

request.getSession(false) will return current session if current session exists. If not, it will not create a new session.

nginx- duplicate default server error

In my case junk files from editor caused the problem. I had a config as below:

#...
http {
 # ...
 include ../sites/*;
}

In the ../sites directory initially I had a default.config file. However, by mistake I saved duplicate files as default.config.save and default.config.save.1. Removing them resolved the issue.

Android changing Floating Action Button color

Other solutions may work. This is the 10 pound gorilla approach that has the advantage of being broadly applicable in this and similar cases:

Styles.xml:

<style name="AppTheme.FloatingAccentButtonOverlay" >
    <item name="colorAccent">@color/colorFloatingActionBarAccent</item>
</style>

your layout xml:

<android.support.design.widget.FloatingActionButton
       android:theme="AppTheme.FloatingAccentButtonOverlay"
       ...
 </android.support.design.widget.FloatingActionButton>

How can I check if the array of objects have duplicate property values?

Use array.prototype.map and array.prototype.some:

var values = [
    { name: 'someName1' },
    { name: 'someName2' },
    { name: 'someName4' },
    { name: 'someName2' }
];

var valueArr = values.map(function(item){ return item.name });
var isDuplicate = valueArr.some(function(item, idx){ 
    return valueArr.indexOf(item) != idx 
});
console.log(isDuplicate);

JSFIDDLE.

iOS9 Untrusted Enterprise Developer with no option to trust

On iOS 9.2 Profiles renamed to Device Management.
Now navigation looks like that:
Settings -> General -> Device Management -> Tap on necessary profile in list -> Trust.

Why does JSON.parse fail with the empty string?

As an empty string is not valid JSON it would be incorrect for JSON.parse('') to return null because "null" is valid JSON. e.g.

JSON.parse("null");

returns null. It would be a mistake for invalid JSON to also be parsed to null.

While an empty string is not valid JSON two quotes is valid JSON. This is an important distinction.

Which is to say a string that contains two quotes is not the same thing as an empty string.

JSON.parse('""');

will parse correctly, (returning an empty string). But

JSON.parse('');

will not.

Valid minimal JSON strings are

The empty object '{}'

The empty array '[]'

The string that is empty '""'

A number e.g. '123.4'

The boolean value true 'true'

The boolean value false 'false'

The null value 'null'

setState() inside of componentDidUpdate()

this.setState creates an infinite loop when used in ComponentDidUpdate when there is no break condition in the loop. You can use redux to set a variable true in the if statement and then in the condition set the variable false then it will work.

Something like this.

if(this.props.route.params.resetFields){

        this.props.route.params.resetFields = false;
        this.setState({broadcastMembersCount: 0,isLinkAttached: false,attachedAffiliatedLink:false,affilatedText: 'add your affiliate link'});
        this.resetSelectedContactAndGroups();
        this.hideNext = false;
        this.initialValue_1 = 140;
        this.initialValue_2 = 140;
        this.height = 20
    }

How do I trim() a string in angularjs?

use trim() method of javascript after all angularjs is also a javascript framework and it is not necessary to put $ to apply trim()

for example

var x="hello world";
x=x.trim()

Removing duplicates from rows based on specific columns in an RDD/Spark DataFrame

Pyspark does include a dropDuplicates() method, which was introduced in 1.4. https://spark.apache.org/docs/latest/api/python/pyspark.sql.html#pyspark.sql.DataFrame.dropDuplicates

>>> from pyspark.sql import Row
>>> df = sc.parallelize([ \
...     Row(name='Alice', age=5, height=80), \
...     Row(name='Alice', age=5, height=80), \
...     Row(name='Alice', age=10, height=80)]).toDF()
>>> df.dropDuplicates().show()
+---+------+-----+
|age|height| name|
+---+------+-----+
|  5|    80|Alice|
| 10|    80|Alice|
+---+------+-----+

>>> df.dropDuplicates(['name', 'height']).show()
+---+------+-----+
|age|height| name|
+---+------+-----+
|  5|    80|Alice|
+---+------+-----+

How do I duplicate a line or selection within Visual Studio Code?

If you coming from Sublime Text and do not want to relearn new key binding, you can use this extension for Visual Code Studio.

Sublime Text Keymap for VS Code

This extension ports the most popular Sublime Text keyboard shortcuts to Visual Studio Code. After installing the extension and restarting VS Code your favorite keyboard shortcuts from Sublime Text are now available.

https://marketplace.visualstudio.com/items?itemName=ms-vscode.sublime-keybindings

How to disable a button when an input is empty?

Using constants allows to combine multiple fields for verification:

_x000D_
_x000D_
class LoginFrm extends React.Component {_x000D_
  constructor() {_x000D_
    super();_x000D_
    this.state = {_x000D_
      email: '',_x000D_
      password: '',_x000D_
    };_x000D_
  }_x000D_
  _x000D_
  handleEmailChange = (evt) => {_x000D_
    this.setState({ email: evt.target.value });_x000D_
  }_x000D_
  _x000D_
  handlePasswordChange = (evt) => {_x000D_
    this.setState({ password: evt.target.value });_x000D_
  }_x000D_
  _x000D_
  handleSubmit = () => {_x000D_
    const { email, password } = this.state;_x000D_
    alert(`Welcome ${email} password: ${password}`);_x000D_
  }_x000D_
  _x000D_
  render() {_x000D_
    const { email, password } = this.state;_x000D_
    const enabled =_x000D_
          email.length > 0 &&_x000D_
          password.length > 0;_x000D_
    return (_x000D_
      <form onSubmit={this.handleSubmit}>_x000D_
        <input_x000D_
          type="text"_x000D_
          placeholder="Email"_x000D_
          value={this.state.email}_x000D_
          onChange={this.handleEmailChange}_x000D_
        />_x000D_
        _x000D_
        <input_x000D_
          type="password"_x000D_
          placeholder="Password"_x000D_
          value={this.state.password}_x000D_
          onChange={this.handlePasswordChange}_x000D_
        />_x000D_
        <button disabled={!enabled}>Login</button>_x000D_
      </form>_x000D_
    )_x000D_
  }_x000D_
}_x000D_
_x000D_
ReactDOM.render(<LoginFrm />, document.body);
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>_x000D_
<body>_x000D_
_x000D_
_x000D_
</body>
_x000D_
_x000D_
_x000D_

Why can't I duplicate a slice with `copy()`?

If your slices were of the same size, it would work:

arr := []int{1, 2, 3}
tmp := []int{0, 0, 0}
i := copy(tmp, arr)
fmt.Println(i)
fmt.Println(tmp)
fmt.Println(arr)

Would give:

3
[1 2 3]
[1 2 3]

From "Go Slices: usage and internals":

The copy function supports copying between slices of different lengths (it will copy only up to the smaller number of elements)

The usual example is:

t := make([]byte, len(s), (cap(s)+1)*2)
copy(t, s)
s = t

How do I block comment in Jupyter notebook?

I have not yet managed to find the best way possible. Since I am using a keyboard with Finnish layout, some of the answers do not work for me (e.g. user5036413's answer).

However, in the meantime, I have come up with a solution that at least helps me not to comment each and every line one by one. I am using Chrome browser in MS Windows and I have not checked other possibilities though.

The solution:
It uses the fact that you can have multiple line cursors in an Ipython Notebook.

Press the Alt button and keep holding it. The cursor should change its shape into a big plus sign. The next step is, using your mouse, to point to the beginning of the first line you want to comment and while holding the Alt button pull down your mouse until the last line you want to comment. Finally, you can release the Alt button and then use the # character to comment. Voila! You have now commented multiple lines.

Remove duplicates from a list of objects based on property in Java 8

If order does not matter and when it's more performant to run in parallel, Collect to a Map and then get values:

employee.stream().collect(Collectors.toConcurrentMap(Employee::getId, Function.identity(), (p, q) -> p)).values()

How to change text color and console color in code::blocks?

You can also use rlutil:

  • cross platform,
  • header only (rlutil.h),
  • works for C and C++,
  • implements setColor(), cls(), getch(), gotoxy(), etc.
  • License: WTFPL

Your code would become something like this:

#include <stdio.h>

#include "rlutil.h"

int main(int argc, char* argv[])
{
    setColor(BLUE);
    printf("\n \n \t This is dummy program for text color ");
    getch();

    return 0;
}

Have a look at example.c and test.cpp for C and C++ examples.

Reactjs setState() with a dynamic key name?

I was looking for a pretty and simple solution and I found this:

this.setState({ [`image${i}`]: image })

Hope this helps

Rendering partial view on button click in ASP.NET MVC

Change the button to

<button id="search">Search</button>

and add the following script

var url = '@Url.Action("DisplaySearchResults", "Search")';
$('#search').click(function() {
  var keyWord = $('#Keyword').val();
  $('#searchResults').load(url, { searchText: keyWord });
})

and modify the controller method to accept the search text

public ActionResult DisplaySearchResults(string searchText)
{
  var model = // build list based on parameter searchText
   return PartialView("SearchResults", model);
}

The jQuery .load method calls your controller method, passing the value of the search text and updates the contents of the <div> with the partial view.

Side note: The use of a <form> tag and @Html.ValidationSummary() and @Html.ValidationMessageFor() are probably not necessary here. Your never returning the Index view so ValidationSummary makes no sense and I assume you want a null search text to return all results, and in any case you do not have any validation attributes for property Keyword so there is nothing to validate.

Edit

Based on OP's comments that SearchCriterionModel will contain multiple properties with validation attributes, then the approach would be to include a submit button and handle the forms .submit() event

<input type="submit" value="Search" />

var url = '@Url.Action("DisplaySearchResults", "Search")';
$('form').submit(function() {
  if (!$(this).valid()) { 
    return false; // prevent the ajax call if validation errors
  }
  var form = $(this).serialize();
  $('#searchResults').load(url, form);
  return false; // prevent the default submit action
})

and the controller method would be

public ActionResult DisplaySearchResults(SearchCriterionModel criteria)
{
  var model = // build list based on the properties of criteria
  return PartialView("SearchResults", model);
}

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

(Analogue of https://stackoverflow.com/a/54967187/2338477, slightly modified).

Here is my own solution with minimum define magic and support of individual enum assignments.

Here is header file:

#pragma once
#include <string>
#include <map>
#include <regex>

template <class Enum>
class EnumReflect
{
public:
    static const char* getEnums() { return ""; }
};

//
//  Just a container for each enumeration type.
//
template <class Enum>
class EnumReflectBase
{
public:
    static std::map<std::string, int> enum2int;
    static std::map<int, std::string> int2enum;

    static void EnsureEnumMapReady( const char* enumsInfo )
    {
        if (*enumsInfo == 0 || enum2int.size() != 0 )
            return;

        // Should be called once per each enumeration.
        std::string senumsInfo(enumsInfo);
        std::regex re("^([a-zA-Z_][a-zA-Z0-9_]+) *=? *([^,]*)(,|$) *");     // C++ identifier to optional " = <value>"
        std::smatch sm;
        int value = 0;

        for (; regex_search(senumsInfo, sm, re); senumsInfo = sm.suffix(), value++)
        {
            string enumName = sm[1].str();
            string enumValue = sm[2].str();

            if (enumValue.length() != 0)
                value = atoi(enumValue.c_str());

            enum2int[enumName] = value;
            int2enum[value] = enumName;
        }
    }
};

template <class Enum>
std::map<std::string, int> EnumReflectBase<Enum>::enum2int;

template <class Enum>
std::map<int, std::string> EnumReflectBase<Enum>::int2enum;


#define DECLARE_ENUM(name, ...)                                         \
    enum name { __VA_ARGS__ };                                          \
    template <>                                                         \
    class EnumReflect<##name>: public EnumReflectBase<##name> {         \
    public:                                                             \
        static const char* getEnums() { return #__VA_ARGS__; }          \
    };




/*
    Basic usage:

    Declare enumeration:

DECLARE_ENUM( enumName,

    enumValue1,
    enumValue2,
    enumValue3 = 5,

    // comment
    enumValue4
);

    Conversion logic:

    From enumeration to string:

        printf( EnumToString(enumValue3).c_str() );

    From string to enumeration:

       enumName value;

       if( !StringToEnum("enumValue4", value) )
            printf("Conversion failed...");
*/

//
//  Converts enumeration to string, if not found - empty string is returned.
//
template <class T>
std::string EnumToString(T t)
{
    EnumReflect<T>::EnsureEnumMapReady(EnumReflect<T>::getEnums());
    auto& int2enum = EnumReflect<T>::int2enum;
    auto it = int2enum.find(t);

    if (it == int2enum.end())
        return "";

    return it->second;
}

//
//  Converts string to enumeration, if not found - false is returned.
//
template <class T>
bool StringToEnum(const char* enumName, T& t)
{
    EnumReflect<T>::EnsureEnumMapReady(EnumReflect<T>::getEnums());
    auto& enum2int = EnumReflect<T>::enum2int;
    auto it = enum2int.find(enumName);

    if (it == enum2int.end())
        return false;

    t = (T) it->second;
    return true;
}

And here is example test application:

DECLARE_ENUM(TestEnum,
    ValueOne,
    ValueTwo,
    ValueThree = 5,
    ValueFour = 7
);

DECLARE_ENUM(TestEnum2,
    ValueOne2 = -1,
    ValueTwo2,
    ValueThree2 = -4,
    ValueFour2
);

void main(void)
{
    string sName1 = EnumToString(ValueOne);
    string sName2 = EnumToString(ValueTwo);
    string sName3 = EnumToString(ValueThree);
    string sName4 = EnumToString(ValueFour);

    TestEnum t1, t2, t3, t4, t5 = ValueOne;
    bool b1 = StringToEnum(sName1.c_str(), t1);
    bool b2 = StringToEnum(sName2.c_str(), t2);
    bool b3 = StringToEnum(sName3.c_str(), t3);
    bool b4 = StringToEnum(sName4.c_str(), t4);
    bool b5 = StringToEnum("Unknown", t5);

    string sName2_1 = EnumToString(ValueOne2);
    string sName2_2 = EnumToString(ValueTwo2);
    string sName2_3 = EnumToString(ValueThree2);
    string sName2_4 = EnumToString(ValueFour2);

    TestEnum2 t2_1, t2_2, t2_3, t2_4, t2_5 = ValueOne2;
    bool b2_1 = StringToEnum(sName2_1.c_str(), t2_1);
    bool b2_2 = StringToEnum(sName2_2.c_str(), t2_2);
    bool b2_3 = StringToEnum(sName2_3.c_str(), t2_3);
    bool b2_4 = StringToEnum(sName2_4.c_str(), t2_4);
    bool b2_5 = StringToEnum("Unknown", t2_5);

Updated version of same header file will be kept here:

https://github.com/tapika/cppscriptcore/blob/master/SolutionProjectModel/EnumReflect.h

org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]]A child container failed during start

Below solution worked for me: Navigate to Project->Clean.. Clean all the projects referenced by Tomcat server Refresh the project you're trying to run on Tomcat

Try to run the server afterwards

Pandas unstack problems: ValueError: Index contains duplicate entries, cannot reshape

I had such problem. In my case problem was in data - my column 'information' contained 1 unique value and it caused error

UPDATE: to correct work 'pivot' pairs (id_user,information) cannot have duplicates

It works:

df2 = pd.DataFrame({'id_user':[1,2,3,4,4,5,5], 
'information':['phon','phon','phone','phone1','phone','phone1','phone'], 
'value': [1, '01.01.00', '01.02.00', 2, '01.03.00', 3, '01.04.00']})
df2.pivot(index='id_user', columns='information', values='value')

it doesn't work:

df2 = pd.DataFrame({'id_user':[1,2,3,4,4,5,5], 
'information':['phone','phone','phone','phone','phone','phone','phone'], 
'value': [1, '01.01.00', '01.02.00', 2, '01.03.00', 3, '01.04.00']})
df2.pivot(index='id_user', columns='information', values='value')

source: https://stackoverflow.com/a/37021196/6088984

How to find duplicate records in PostgreSQL

You can join to the same table on the fields that would be duplicated and then anti-join on the id field. Select the id field from the first table alias (tn1) and then use the array_agg function on the id field of the second table alias. Finally, for the array_agg function to work properly, you will group the results by the tn1.id field. This will produce a result set that contains the the id of a record and an array of all the id's that fit the join conditions.

select tn1.id,
       array_agg(tn2.id) as duplicate_entries, 
from table_name tn1 join table_name tn2 on 
    tn1.year = tn2.year 
    and tn1.sid = tn2.sid 
    and tn1.user_id = tn2.user_id 
    and tn1.cid = tn2.cid
    and tn1.id <> tn2.id
group by tn1.id;

Obviously, id's that will be in the duplicate_entries array for one id, will also have their own entries in the result set. You will have to use this result set to decide which id you want to become the source of 'truth.' The one record that shouldn't get deleted. Maybe you could do something like this:

with dupe_set as (
select tn1.id,
       array_agg(tn2.id) as duplicate_entries, 
from table_name tn1 join table_name tn2 on 
    tn1.year = tn2.year 
    and tn1.sid = tn2.sid 
    and tn1.user_id = tn2.user_id 
    and tn1.cid = tn2.cid
    and tn1.id <> tn2.id
group by tn1.id
order by tn1.id asc)
select ds.id from dupe_set ds where not exists 
 (select de from unnest(ds.duplicate_entries) as de where de < ds.id)

Selects the lowest number ID's that have duplicates (assuming the ID is increasing int PK). These would be the ID's that you would keep around.

Mongodb find() query : return only unique values (no duplicates)

I think you can use db.collection.distinct(fields,query)

You will be able to get the distinct values in your case for NetworkID.

It should be something like this :

Db.collection.distinct('NetworkID')

Pandas merge two dataframes with different columns

I think in this case concat is what you want:

In [12]:

pd.concat([df,df1], axis=0, ignore_index=True)
Out[12]:
   attr_1  attr_2  attr_3  id  quantity
0       0       1     NaN   1        20
1       1       1     NaN   2        23
2       1       1     NaN   3        19
3       0       0     NaN   4        19
4       1     NaN       0   5         8
5       0     NaN       1   6        13
6       1     NaN       1   7        20
7       1     NaN       1   8        25

by passing axis=0 here you are stacking the df's on top of each other which I believe is what you want then producing NaN value where they are absent from their respective dfs.

Check if an element has event listener on it. No jQuery

You don't need to. Just slap it on there as many times as you want and as often as you want. MDN explains identical event listeners:

If multiple identical EventListeners are registered on the same EventTarget with the same parameters, the duplicate instances are discarded. They do not cause the EventListener to be called twice, and they do not need to be removed manually with the removeEventListener method.

How do I install a Python package with a .whl file?

There's a slight difference between accessing the .whl file in python2 and python3.In python3 you need to install wheel first and then you can access .whl files.

Python3

pip install wheel

And then by using wheel

wheel unpack some-package.whl

Python2

pip install some-package.whl

How do I deal with special characters like \^$.?*|+()[{ in my regex?

I think the easiest way to match the characters like

\^$.?*|+()[

are using character classes from within R. Consider the following to clean column headers from a data file, which could contain spaces, and punctuation characters:

> library(stringr)
> colnames(order_table) <- str_replace_all(colnames(order_table),"[:punct:]|[:space:]","")

This approach allows us to string character classes to match punctation characters, in addition to whitespace characters, something you would normally have to escape with \\ to detect. You can learn more about the character classes at this cheatsheet below, and you can also type in ?regexp to see more info about this.

https://www.rstudio.com/wp-content/uploads/2016/09/RegExCheatsheet.pdf

Java 8, Streams to find the duplicate elements

A multiset is a structure maintaining the number of occurrences for each element. Using Guava implementation:

Set<Integer> duplicated =
        ImmutableMultiset.copyOf(numbers).entrySet().stream()
                .filter(entry -> entry.getCount() > 1)
                .map(Multiset.Entry::getElement)
                .collect(Collectors.toSet());

is there a function in lodash to replace matched item

function findAndReplace(arr, find, replace) {
  let i;
  for(i=0; i < arr.length && arr[i].id != find.id; i++) {}
  i < arr.length ? arr[i] = replace : arr.push(replace);
}

Now let's test performance for all methods:

_x000D_
_x000D_
// TC's first approach_x000D_
function first(arr, a, b) {_x000D_
  _.each(arr, function (x, idx) {_x000D_
    if (x.id === a.id) {_x000D_
      arr[idx] = b;_x000D_
      return false;_x000D_
    }_x000D_
  });_x000D_
}_x000D_
_x000D_
// solution with merge_x000D_
function second(arr, a, b) {_x000D_
  const match = _.find(arr, a);_x000D_
  if (match) {_x000D_
    _.merge(match, b);_x000D_
  } else {_x000D_
    arr.push(b);_x000D_
  }_x000D_
}_x000D_
_x000D_
// most voted solution_x000D_
function third(arr, a, b) {_x000D_
  const match = _.find(arr, a);_x000D_
  if (match) {_x000D_
    var index = _.indexOf(arr, _.find(arr, a));_x000D_
    arr.splice(index, 1, b);_x000D_
  } else {_x000D_
    arr.push(b);_x000D_
  }_x000D_
}_x000D_
_x000D_
// my approach_x000D_
function fourth(arr, a, b){_x000D_
  let l;_x000D_
  for(l=0; l < arr.length && arr[l].id != a.id; l++) {}_x000D_
  l < arr.length ? arr[l] = b : arr.push(b);_x000D_
}_x000D_
_x000D_
function test(fn, times, el) {_x000D_
  const arr = [], size = 250;_x000D_
  for (let i = 0; i < size; i++) {_x000D_
    arr[i] = {id: i, name: `name_${i}`, test: "test"};_x000D_
  }_x000D_
_x000D_
  let start = Date.now();_x000D_
  _.times(times, () => {_x000D_
    const id = Math.round(Math.random() * size);_x000D_
    const a = {id};_x000D_
    const b = {id, name: `${id}_name`};_x000D_
    fn(arr, a, b);_x000D_
  });_x000D_
  el.innerHTML = Date.now() - start;_x000D_
}_x000D_
_x000D_
test(first, 1e5, document.getElementById("first"));_x000D_
test(second, 1e5, document.getElementById("second"));_x000D_
test(third, 1e5, document.getElementById("third"));_x000D_
test(fourth, 1e5, document.getElementById("fourth"));
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.14.1/lodash.min.js"></script>_x000D_
<div>_x000D_
  <ol>_x000D_
    <li><b id="first"></b> ms [TC's first approach]</li>_x000D_
    <li><b id="second"></b> ms [solution with merge]</li>_x000D_
    <li><b id="third"></b> ms [most voted solution]</li>_x000D_
    <li><b id="fourth"></b> ms [my approach]</li>_x000D_
  </ol>_x000D_
<div>
_x000D_
_x000D_
_x000D_

Get current date in DD-Mon-YYY format in JavaScript/Jquery

//convert DateTime result in jquery mvc 5 using entity fremwork 

const monthNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];


function DateAndTime(date) {

    var value = new Date
        (
        parseInt(date.replace(/(^.*\()|([+-].*$)/g, ''))
    ); 
    var dat = value.getDate() +
        "-" +
        monthNames[value.getMonth()] +
        "-" +
        value.getFullYear();

    var hours = value.getHours();
    var minutes = value.getMinutes();
    var ampm = hours >= 12 ? 'PM' : 'AM';
    hours = hours % 12;
    hours = hours ? hours : 12; // the hour '0' should be '12'
    minutes = minutes < 10 ? '0' + minutes : minutes;
    var strTime = hours + ':' + minutes + ' ' + ampm;
    return { Date: dat, Time: strTime };
}
// var getdate = DateAndTime(StartDate);
//var Date = getdate.Date;//here get date
//var time = getdate.Time;//here get Time
//alert(Date)

Debugging with Android Studio stuck at "Waiting For Debugger" forever

On some machines/projects the debugger do not attach automatically so you need to attach it manually (studio menu -> Run -> Attach debugger to Android process)

Conditionally formatting cells if their value equals any value of another column

I was looking into this and loved the approach from peege using a for loop! (because I'm learning VBA at the moment)

However, if we are trying to match "any" value of another column, how about using nested loops like the following?

Sub MatchAndColor()

Dim lastRow As Long
Dim sheetName As String


sheetName = "Sheet1"            'Insert your sheet name here
lastRow = Sheets(sheetName).Range("A" & Rows.Count).End(xlUp).Row

For lRowA = 1 To lastRow         'Loop through all rows
    For lRowB = 1 To lastRow
        If Sheets(sheetName).Cells(lRowA, "A") = Sheets(sheetName).Cells(lRowB, "B") Then

        Sheets(sheetName).Cells(lRowA, "A").Interior.ColorIndex = 3  'Set Color to RED
    End If

Next lRowB
Next lRowA

End Sub

What does `ValueError: cannot reindex from a duplicate axis` mean?

This error usually rises when you join / assign to a column when the index has duplicate values. Since you are assigning to a row, I suspect that there is a duplicate value in affinity_matrix.columns, perhaps not shown in your question.

INSTALL_FAILED_DUPLICATE_PERMISSION... C2D_MESSAGE

Remove any "Hard Coded" reference of your package name, from your manifest file.

(This is best practice even if you don't using productFlavors)

For example, if your manifest contains:

<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE"/>
<uses-permission android:name="com.yourpackage.name.permission.C2D_MESSAGE"/>

<permission
    android:name="com.yourpackage.name.permission.C2D_MESSAGE"
    android:protectionLevel="signature"/>
<permission
    android:name="com.yourpackage.name.permission.MAPS_RECEIVE"
    android:protectionLevel="signature"/>

Changed it to:

<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE"/>
<uses-permission android:name="${applicationId}.permission.C2D_MESSAGE"/>

<permission
    android:name="${applicationId}.permission.C2D_MESSAGE"
    android:protectionLevel="signature"/>
<permission
    android:name="${applicationId}.permission.MAPS_RECEIVE"
    android:protectionLevel="signature"/>

Then, in your module gradle file, set your relevant applicationId:

signingConfigs {
    stage {
        storeFile file('keystore/stage.keystore')
        storePassword 'android'
        keyAlias 'androiddebugkey'
        keyPassword 'android'
    }
    production {
        storeFile file('keystore/playstore.keystore')
        storePassword store_password
        keyAlias key_alias
        keyPassword key_password
    }
}

productFlavors {
    staging {
        signingConfig signingConfigs.staging
        applicationId defaultConfig.applicationId + ".staging"
        versionName defaultConfig.versionName + "-staging"
    }

    production {
        signingConfig signingConfigs.production
    }
}

You can follow this tutorial for more info

Find duplicate records in MongoDB

The answer anhic gave can be very inefficient if you have a large database and the attribute name is present only in some of the documents.

To improve efficiency you can add a $match to the aggregation.

db.collection.aggregate(
    {"$match": {"name" :{ "$ne" : null } } }, 
    {"$group" : {"_id": "$name", "count": { "$sum": 1 } } },
    {"$match": {"count" : {"$gt": 1} } }, 
    {"$project": {"name" : "$_id", "_id" : 0} }
)

java.util.zip.ZipException: duplicate entry during packageAllDebugClassesForMultiDex

For me something similar happened when I had accidently added

apply plugin: 'kotlin-android'

to my android library module. Removing the line fixes the issue.

Typescript: How to extend two classes?

In design patterns there is a principle called "favouring composition over inheritance". It says instead of inheriting Class B from Class A ,put an instance of class A inside class B as a property and then you can use functionalities of class A inside class B. You can see some examples of that here and here.

Stupid error: Failed to load resource: net::ERR_CACHE_MISS

If you are using bootstrap that will be the problem. If you want to use same bootstrap file in two locations use it below the header section .(example - inside body)

Note : "specially when you use html editors. "

Thank you.

Duplicate Symbols for Architecture arm64

In my case reason was too stupid :

I had a Constant.h file where I had macros defined. I thought of doing NSString there. and did this :

NSString const *kGreenColor = @"#00C34E";

this caused the problem of Duplicate Symbols for Architecture arm64 and Linker command failed with exit code 1. Removing const NSString line worked for me.

Starting Docker as Daemon on Ubuntu

There are multiple popular repositories offering docker packages for Ubuntu. The package docker.io is (most likely) from the Ubuntu repository. Another popular one is http://get.docker.io/ubuntu which offers a package lxc-docker (I am running the latter because it ships updates faster). Make sure only one package is installed. Not quite sure if removal of the packages cleans up properly. If sudo service docker restart still does not work, you may have to clean up manually in /etc/.

How to plot a function curve in R

plot has a plot.function method

plot(eq, 1, 1000)

Or

curve(eq, 1, 1000)

Eclipse error "Could not find or load main class"

Just go to your Package Explorer and press F5, or for some laptops fn+F5. The reason is that eclipse thinks that the files are somewhere, but the files are actually somewhere else. By refreshing it, you put them both on the same page. Don't worry, you won't lose anything, but if you want to be extra careful, just back up the files from your java projects folder to somewhere safe.

Removing duplicate elements from an array in Swift

if you want to keep the order as well then use this

let fruits = ["apple", "pear", "pear", "banana", "apple"] 
let orderedNoDuplicates = Array(NSOrderedSet(array: fruits).map({ $0 as! String }))

How to Migrate to WKWebView?

UIWebView will still continue to work with existing apps. WKWebView is available starting from iOS8, only WKWebView has a Nitro JavaScript engine.

To take advantage of this faster JavaScript engine in older apps you have to make code changes to use WKWebView instead of UIWebView. For iOS7 and older, you have to continue to use UIWebView, so you may have to check for iOS8 and then apply WKWebView methods / delegate methods and fallback to UIWebView methods for iOS7 and older. Also there is no Interface Builder component for WKWebView (yet), so you have to programmatically implement WKWebView.

You can implement WKWebView in Objective-C, here is simple example to initiate a WKWebView:

WKWebViewConfiguration *theConfiguration = [[WKWebViewConfiguration alloc] init];
WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration:theConfiguration];
webView.navigationDelegate = self;
NSURL *nsurl=[NSURL URLWithString:@"http://www.apple.com"];
NSURLRequest *nsrequest=[NSURLRequest requestWithURL:nsurl];
[webView loadRequest:nsrequest];
[self.view addSubview:webView];

WKWebView rendering performance is noticeable in WebGL games and something that runs complex JavaScript algorithms, if you are using webview to load a simple html or website, you can continue to use UIWebView.

Here is a test app that can used to open any website using either UIWebView or WKWebView and you can compare performance, and then decide on upgrading your app to use WKWebView: https://itunes.apple.com/app/id928647773?mt=8&at=10ltWQ

enter image description here

Unity 2d jumping script

Usually for jumping people use Rigidbody2D.AddForce with Forcemode.Impulse. It may seem like your object is pushed once in Y axis and it will fall down automatically due to gravity.

Example:

rigidbody2D.AddForce(new Vector2(0, 10), ForceMode2D.Impulse);

Gulp command not found after install

I had this problem with getting "command not found" after install but I was installed into /usr/local as described in the solution above.

My problem seemed to be caused by me running the install with sudo. I did the following.

  1. Removing gulp again with sudo
  2. Changing the owner of /usr/local/lib/node_modules to my user
  3. Installing gulp again without sudo. "npm install gulp -g"

Change grid interval and specify tick labels in Matplotlib

A subtle alternative to MaxNoe's answer where you aren't explicitly setting the ticks but instead setting the cadence.

import matplotlib.pyplot as plt
from matplotlib.ticker import (AutoMinorLocator, MultipleLocator)

fig, ax = plt.subplots(figsize=(10, 8))

# Set axis ranges; by default this will put major ticks every 25.
ax.set_xlim(0, 200)
ax.set_ylim(0, 200)

# Change major ticks to show every 20.
ax.xaxis.set_major_locator(MultipleLocator(20))
ax.yaxis.set_major_locator(MultipleLocator(20))

# Change minor ticks to show every 5. (20/4 = 5)
ax.xaxis.set_minor_locator(AutoMinorLocator(4))
ax.yaxis.set_minor_locator(AutoMinorLocator(4))

# Turn grid on for both major and minor ticks and style minor slightly
# differently.
ax.grid(which='major', color='#CCCCCC', linestyle='--')
ax.grid(which='minor', color='#CCCCCC', linestyle=':')

Matplotlib Custom Grid

Android Studio - No JVM Installation found

My fix was to remove the double quotes that I had enclosed the JAVA_HOME path in.

Instead of declaring JAVA_HOME as "C\Program Files..."

I removed the " and declared JAVA_HOME as C\Program Files...

I am on Win 7, x64

Python mock multiple return values

You can assign an iterable to side_effect, and the mock will return the next value in the sequence each time it is called:

>>> from unittest.mock import Mock
>>> m = Mock()
>>> m.side_effect = ['foo', 'bar', 'baz']
>>> m()
'foo'
>>> m()
'bar'
>>> m()
'baz'

Quoting the Mock() documentation:

If side_effect is an iterable then each call to the mock will return the next value from the iterable.

Sending a JSON to server and retrieving a JSON in return, without JQuery

Using new api fetch:

_x000D_
_x000D_
const dataToSend = JSON.stringify({"email": "[email protected]", "password": "101010"});
let dataReceived = ""; 
fetch("", {
    credentials: "same-origin",
    mode: "same-origin",
    method: "post",
    headers: { "Content-Type": "application/json" },
    body: dataToSend
})
    .then(resp => {
        if (resp.status === 200) {
            return resp.json()
        } else {
            console.log("Status: " + resp.status)
            return Promise.reject("server")
        }
    })
    .then(dataJson => {
        dataReceived = JSON.parse(dataJson)
    })
    .catch(err => {
        if (err === "server") return
        console.log(err)
    })

console.log(`Received: ${dataReceived}`)                
_x000D_
_x000D_
_x000D_ You need to handle when server sends other status rather than 200(ok), you should reject that result because if you were to left it in blank, it will try to parse the json but there isn't, so it will throw an error

E11000 duplicate key error index in mongodb mongoose

I have also faced this issue and I solved it. This error shows that email is already present here. So you just need to remove this line from your Model for email attribute.

unique: true

This might be possible that even if it won't work. So just need to delete the collection from your MongoDB and restart your server.

PHP - Session destroy after closing browser

There are different ways to do this, but the server can't detect when de browser gets closed so destroying it then is hard.

  • timeout session.

Either create a new session with the current time or add a time variable to the current session. and then check it when you start up or perform an action to see if the session has to be removed.

session_start();
$_SESSION["timeout"] = time();
//if 100 seconds have passed since creating session delete it.
if(time() - $_SESSION["timeout"] > 100){ 
    unset($_SESSION["timeout"];
}
  • ajax

Make javascript perform an ajax call that will delete the session, with onbeforeunload() a javascript function that calls a final action when the user leaves the page. For some reason this doesnt always work though.

  • delete it on startup.

If you always want the user to see the login page on startup after the page has been closed you can just delete the session on startup.

<? php
session_start();
unset($_SESSION["session"]);

and there probably are some more.

Python equivalent of a given wget command

easy as py:

class Downloder():
    def download_manager(self, url, destination='Files/DownloderApp/', try_number="10", time_out="60"):
        #threading.Thread(target=self._wget_dl, args=(url, destination, try_number, time_out, log_file)).start()
        if self._wget_dl(url, destination, try_number, time_out, log_file) == 0:
            return True
        else:
            return False


    def _wget_dl(self,url, destination, try_number, time_out):
        import subprocess
        command=["wget", "-c", "-P", destination, "-t", try_number, "-T", time_out , url]
        try:
            download_state=subprocess.call(command)
        except Exception as e:
            print(e)
        #if download_state==0 => successfull download
        return download_state

Duplicate symbols for architecture x86_64 under Xcode

just uninstall the pod which it is related to and reinstall them.

Python Pandas replicate rows in dataframe

df = df_try
for i in range(4):
   df = df.append(df_try)

# Here, we have df_try times 5

df = df.append(df)

# Here, we have df_try times 10

Why do multiple-table joins produce duplicate rows?

When you have related tables you often have one-to-many or many-to-many relationships. So when you join to TableB each record in TableA many have multiple records in TableB. This is normal and expected.

Now at times you only need certain columns and those are all the same for all the records, then you would need to do some sort of group by or distinct to remove the duplicates. Let's look at an example:

TableA
Id Field1
1  test
2  another test

TableB
ID Field2 field3
1  Test1  something
1  test1  More something
2  Test2  Anything

So when you join them and select all the files you get:

select * 
from tableA a 
join tableb b on a.id = b.id

a.Id a.Field1        b.id   b.field2  b.field3
1    test            1      Test1     something
1    test            1      Test1     More something
2    another test 2  2      Test2     Anything

These are not duplicates because the values of Field3 are different even though there are repeated values in the earlier fields. Now when you only select certain columns the same number of records are being joined together but since the columns with the different information is not being displayed they look like duplicates.

select a.Id, a.Field1,  b.field2
from tableA a 
join tableb b on a.id = b.id

a.Id a.Field1       b.field2  
1    test           Test1     
1    test           Test1 
2    another test   Test2

This appears to be duplicates but it is not because of the multiple records in TableB.

You normally fix this by using aggregates and group by, by using distinct or by filtering in the where clause to remove duplicates. How you solve this depends on exactly what your business rule is and how your database is designed and what kind of data is in there.

Drop all duplicate rows across multiple columns in Python Pandas

Just want to add to Ben's answer on drop_duplicates:

keep : {‘first’, ‘last’, False}, default ‘first’

  • first : Drop duplicates except for the first occurrence.

  • last : Drop duplicates except for the last occurrence.

  • False : Drop all duplicates.

So setting keep to False will give you desired answer.

DataFrame.drop_duplicates(*args, **kwargs) Return DataFrame with duplicate rows removed, optionally only considering certain columns

Parameters: subset : column label or sequence of labels, optional Only consider certain columns for identifying duplicates, by default use all of the columns keep : {‘first’, ‘last’, False}, default ‘first’ first : Drop duplicates except for the first occurrence. last : Drop duplicates except for the last occurrence. False : Drop all duplicates. take_last : deprecated inplace : boolean, default False Whether to drop duplicates in place or to return a copy cols : kwargs only argument of subset [deprecated] Returns: deduplicated : DataFrame

PLS-00201 - identifier must be declared

When creating the TABLE under B2BOWNER, be sure to prefix the PL/SQL function with the Schema name; i.e. B2BOWNER.F_SSC_Page_Map_Insert.

I did not realize this until the DBAs pointed it out. I could have created the table under my root USER/SCHEMA and the PL/SQL function would have worked fine.

Remove Duplicate objects from JSON Array

You can use lodash, download here (4.17.15)

Example code:

var object = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];

_.uniqWith(object, _.isEqual);

// => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]

Returning a value from callback function in Node.js

If what you want is to get your code working without modifying too much. You can try this solution which gets rid of callbacks and keeps the same code workflow:

Given that you are using Node.js, you can use co and co-request to achieve the same goal without callback concerns.

Basically, you can do something like this:

function doCall(urlToCall) {
  return co(function *(){
    var response = yield urllib.request(urlToCall, { wd: 'nodejs' }); // This is co-request.                             
    var statusCode = response.statusCode;
    finalData = getResponseJson(statusCode, data.toString());
    return finalData;
  });
}

Then,

var response = yield doCall(urlToCall); // "yield" garuantees the callback finished.
console.log(response) // The response will not be undefined anymore.

By doing this, we wait until the callback function finishes, then get the value from it. Somehow, it solves your problem.

AngularJS : Factory and Service?

Factory and Service is a just wrapper of a provider.

Factory

Factory can return anything which can be a class(constructor function), instance of class, string, number or boolean. If you return a constructor function, you can instantiate in your controller.

 myApp.factory('myFactory', function () {

  // any logic here..

  // Return any thing. Here it is object
  return {
    name: 'Joe'
  }
}

Service

Service does not need to return anything. But you have to assign everything in this variable. Because service will create instance by default and use that as a base object.

myApp.service('myService', function () {

  // any logic here..

  this.name = 'Joe';
}

Actual angularjs code behind the service

function service(name, constructor) {
    return factory(name, ['$injector', function($injector) {
        return $injector.instantiate(constructor);
    }]);
}

It just a wrapper around the factory. If you return something from service, then it will behave like Factory.

IMPORTANT: The return result from Factory and Service will be cache and same will be returned for all controllers.

When should i use them?

Factory is mostly preferable in all cases. It can be used when you have constructor function which needs to be instantiated in different controllers.

Service is a kind of Singleton Object. The Object return from Service will be same for all controller. It can be used when you want to have single object for entire application. Eg: Authenticated user details.

For further understanding, read

http://iffycan.blogspot.in/2013/05/angular-service-or-factory.html

http://viralpatel.net/blogs/angularjs-service-factory-tutorial/

How to copy a map?

You are not copying the map, but the reference to the map. Your delete thus modifies the values in both your original map and the super map. To copy a map, you have to use a for loop like this:

for k,v := range originalMap {
  newMap[k] = v
}

Here's an example from the now-retired SO documentation:

// Create the original map
originalMap := make(map[string]int)
originalMap["one"] = 1
originalMap["two"] = 2

// Create the target map
targetMap := make(map[string]int)

// Copy from the original map to the target map
for key, value := range originalMap {
  targetMap[key] = value
}

Excerpted from Maps - Copy a Map. The original author was JepZ. Attribution details can be found on the contributor page. The source is licenced under CC BY-SA 3.0 and may be found in the Documentation archive. Reference topic ID: 732 and example ID: 9834.

Remove duplicated rows using dplyr

Here is a solution using dplyr >= 0.5.

library(dplyr)
set.seed(123)
df <- data.frame(
  x = sample(0:1, 10, replace = T),
  y = sample(0:1, 10, replace = T),
  z = 1:10
)

> df %>% distinct(x, y, .keep_all = TRUE)
    x y z
  1 0 1 1
  2 1 0 2
  3 1 1 4

Left Join without duplicate rows from left table

Using the DISTINCT flag will remove duplicate rows.

SELECT DISTINCT
C.Content_ID,
C.Content_Title,
M.Media_Id

FROM tbl_Contents C
LEFT JOIN tbl_Media M ON M.Content_Id = C.Content_Id 
ORDER BY C.Content_DatePublished ASC

Is it ok to scrape data from Google results?

Google will eventually block your IP when you exceed a certain amount of requests.

Loop Through All Subfolders Using VBA

And to complement Rich's recursive answer, a non-recursive method.

Public Sub NonRecursiveMethod()
    Dim fso, oFolder, oSubfolder, oFile, queue As Collection

    Set fso = CreateObject("Scripting.FileSystemObject")
    Set queue = New Collection
    queue.Add fso.GetFolder("your folder path variable") 'obviously replace

    Do While queue.Count > 0
        Set oFolder = queue(1)
        queue.Remove 1 'dequeue
        '...insert any folder processing code here...
        For Each oSubfolder In oFolder.SubFolders
            queue.Add oSubfolder 'enqueue
        Next oSubfolder
        For Each oFile In oFolder.Files
            '...insert any file processing code here...
        Next oFile
    Loop

End Sub

You can use a queue for FIFO behaviour (shown above), or you can use a stack for LIFO behaviour which would process in the same order as a recursive approach (replace Set oFolder = queue(1) with Set oFolder = queue(queue.Count) and replace queue.Remove(1) with queue.Remove(queue.Count), and probably rename the variable...)

Calling async method synchronously

Well I am using this approach:

    private string RunSync()
    {
        var task = Task.Run(async () => await GenerateCodeService.GenerateCodeAsync());
        if (task.IsFaulted && task.Exception != null)
        {
            throw task.Exception;
        }

        return task.Result;
    }

Various ways to remove local Git changes

Option 1: Discard tracked and untracked file changes

Discard changes made to both staged and unstaged files.

$ git reset --hard [HEAD]

Then discard (or remove) untracked files altogether.

$ git clean [-f]

Option 2: Stash

You can first stash your changes

$ git stash

And then either drop or pop it depending on what you want to do. See https://git-scm.com/docs/git-stash#_synopsis.

Option 3: Manually restore files to original state

First we switch to the target branch

$ git checkout <branch-name>

List all files that have changes

$ git status

Restore each file to its original state manually

$ git restore <file-path>

How to have conditional elements and keep DRY with Facebook React's JSX?

There is another solution, if component for React:

var Node = require('react-if-comp');
...
render: function() {
    return (
        <div id="page">
            <Node if={this.state.banner}
                  then={<div id="banner">{this.state.banner}</div>} />
            <div id="other-content">
                blah blah blah...
            </div>
        </div>
    );
}

Gradle finds wrong JAVA_HOME even though it's correctly set

I have tested this on Manjaro Linux. Should work on other Disto too.

You need to include whole java-jdk dir instead of just java/bin for java env var.

For example, instead of:

export JAVA_HOME=/opt/jdk-14.0.2/bin #change path according to your jdk location PATH=$PATH:$JAVA_HOME

use this:

export JAVA_HOME=/opt/jdk-14.0.2/ #change path according to your jdk location PATH=$PATH:$JAVA_HOME

then run the gradle command it will work.

How to change the status bar color in Android?

If you want to change the status bar color programmatically (and provided the device has Android 5.0). This is a simple way to change statusBarColor from any Activity and very easy methods when differents fragments have different status bar color.

 /**
 * @param colorId id of color
 * @param isStatusBarFontDark Light or Dark color
 */
fun updateStatusBarColor(@ColorRes colorId: Int, isStatusBarFontDark: Boolean = true) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        val window = window
        window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
        window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS)
        window.statusBarColor = ContextCompat.getColor(this, colorId)
        setSystemBarTheme(isStatusBarFontDark)
    }
}

/** Changes the System Bar Theme.  */
@RequiresApi(api = Build.VERSION_CODES.M)
private fun setSystemBarTheme(isStatusBarFontDark: Boolean) {
    // Fetch the current flags.
    val lFlags = window.decorView.systemUiVisibility
    // Update the SystemUiVisibility depending on whether we want a Light or Dark theme.
    window.decorView.systemUiVisibility = if (isStatusBarFontDark) lFlags and View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR.inv() else lFlags or View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
}

Google Play Services Missing in Emulator (Android 4.4.2)

Setp 1 : Download the following apk files. 1)com.google.android.gms.apk (https://androidfilehost.com/?fid=95916177934534438) 2)com.android.vending-4.4.22.apk (https://androidfilehost.com/?fid=23203820527945795)

Step 2 : Create a new AVD without the google API's

Step 3 : Run the AVD (Start the emulator)

Step 4 : Install the downloaded apks using adb .

     1)adb install com.google.android.gms-6.7.76_\(1745988-038\)-6776038-minAPI9.apk  
     2)adb install com.android.vending-4.4.22.apk

adb come up with android sdks/studio

Step 5 : Create the application in google developer console

Step 6 : Configure the api key in your Androidmanifest.xml and google api version.

Note : In step1 you need to download the apk based on your Android API level(..18,19,21..) and google play services version (5,5.1,6,6.5......)

This will work 100%.

Removing Duplicate Values from ArrayList

public static List<String> removeDuplicateElements(List<String> array){
    List<String> temp = new ArrayList<String>();
    List<Integer> count = new ArrayList<Integer>();
    for (int i=0; i<array.size()-2; i++){
        for (int j=i+1;j<array.size()-1;j++)
            {
                if (array.get(i).compareTo(array.get(j))==0) {
                    count.add(i);
                    int kk = i;
                }
            }
        }
        for (int i = count.size()+1;i>0;i--) {
            array.remove(i);
        }
        return array;
    }
}

How to highlight cell if value duplicate in same column for google spreadsheet?

From the "Text Contains" dropdown menu select "Custom formula is:", and write: "=countif(A:A, A1) > 1" (without the quotes)

I did exactly as zolley proposed, but there should be done small correction: use "Custom formula is" instead of "Text Contains". And then conditional rendering will work.

Screenshot from menu

Does JSON syntax allow duplicate keys in an object?

The short answer: Yes but is not recommended.
The long answer: It depends on what you call valid...


ECMA-404 "The JSON Data Interchange Syntax" doesn't say anything about duplicated names (keys).


However, RFC 8259 "The JavaScript Object Notation (JSON) Data Interchange Format" says:

The names within an object SHOULD be unique.

In this context SHOULD must be understood as specified in BCP 14:

SHOULD This word, or the adjective "RECOMMENDED", mean that there may exist valid reasons in particular circumstances to ignore a particular item, but the full implications must be understood and carefully weighed before choosing a different course.


RFC 8259 explains why unique names (keys) are good:

An object whose names are all unique is interoperable in the sense that all software implementations receiving that object will agree on the name-value mappings. When the names within an object are not unique, the behavior of software that receives such an object is unpredictable. Many implementations report the last name/value pair only. Other implementations report an error or fail to parse the object, and some implementations report all of the name/value pairs, including duplicates.



Also, as Serguei pointed out in the comments: ECMA-262 "ECMAScript® Language Specification", reads:

In the case where there are duplicate name Strings within an object, lexically preceding values for the same key shall be overwritten.

In other words, last-value-wins.


Trying to parse a string with duplicated names with the Java implementation by Douglas Crockford (the creator of JSON) results in an exception:

org.json.JSONException: Duplicate key "status"  at
org.json.JSONObject.putOnce(JSONObject.java:1076)

Android SDK is missing, out of date, or is missing templates. Please ensure you are using SDK version 22 or later

  1. Create SDK folder at \Android\Sdk
  2. Close any project which is already open in Android studio

Android Studio setup wizard will appear and perform the needed installation.

Perl - Multiple condition if statement without duplicating code?

Simple:

if ( $name eq 'tom' && $password eq '123!'
    || $name eq 'frank' && $password eq '321!'
) {

(use the high-precedence && and || in expressions, reserving and and or for flow control, to avoid common precedence errors)

Better:

my %password = (
    'tom' => '123!',
    'frank' => '321!',
);

if ( exists $password{$name} && $password eq $password{$name} ) {

Delete a database in phpMyAdmin

Taking a queue from michael's answer above, I was unable to find the DROP Database command on my phpMyAdmin console in the localhost.

Apparantly I was missing a setting. Go to config.inc.php file of the phpMyAdmin folder, and add this:

$cfg['AllowUserDropDatabase'] = true;

Save and restart the local server and the command appears inside the console.

Htaccess: add/remove trailing slash from URL

To complement Jon Lin's answer, here is a no-trailing-slash technique that also works if the website is located in a directory (like example.org/blog/):

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} (.+)/$
RewriteRule ^ %1 [R=301,L]


For the sake of completeness, here is an alternative emphasizing that REQUEST_URI starts with a slash (at least in .htaccess files):

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} /(.*)/$
RewriteRule ^ /%1 [R=301,L] <-- added slash here too, don't forget it

Just don't use %{REQUEST_URI} (.*)/$. Because in the root directory REQUEST_URI equals /, the leading slash, and it would be misinterpreted as a trailing slash.


If you are interested in more reading:

(update: this technique is now implemented in Laravel 5.5)

Android Studio suddenly cannot resolve symbols

Struggled with the same problem for a couple hours this morning. Building my project from command line seems to have done the trick for me.

Exact steps -

  1. Cloned fresh repository (no Android studio files are in repo)
  2. Built debug project from command line ( ./gradlew clean assembleDebug )
  3. Open Android Studio, import project

To check if it worked, look in your projects exploded-bundles folder, inspect a library and find the classes.jar. If it is expandable, then everything is going to be ok.

edit - I found after doing a clean within Android studio, it broke again. So if you have to clean, you will need to do this process again.

mvn command not found in OSX Mavrerick

Here is what worked for me.

First of all I checked if M2_HOME variable is set env | grep M2_HOME. I've got nothing.

I knew I had Maven installed in the folder "/usr/local/apache-maven-3.2.2", so executing the following 3 steps solved the problem for me:

  1. Set M2_HOME env variable

M2_HOME=/usr/local/apache-maven-3.2.2

  1. Set M2 env variable

M2=$M2_HOME/bin

  1. Update the PATH

export PATH=$M2:$PATH

As mentioned above you can save that sequence in the .bash_profile file if you want it to be executed automatically.

How to move all HTML element children to another parent using JavaScript?

This answer only really works if you don't need to do anything other than transferring the inner code (innerHTML) from one to the other:

// Define old parent
var oldParent = document.getElementById('old-parent');

// Define new parent
var newParent = document.getElementById('new-parent');

// Basically takes the inner code of the old, and places it into the new one
newParent.innerHTML = oldParent.innerHTML;

// Delete / Clear the innerHTML / code of the old Parent
oldParent.innerHTML = '';

Hope this helps!

Finding duplicate integers in an array and display how many times they occurred

Since you can't use LINQ, you can do this with collections and loops instead:

static void Main(string[] args)
{              
    int[] array = { 10, 5, 10, 2, 2, 3, 4, 5, 5, 6, 7, 8, 9, 11, 12, 12 };
    var dict = new Dictionary<int, int>();

    foreach(var value in array)
    {
        if (dict.ContainsKey(value))
            dict[value]++;
        else
            dict[value] = 1;
    }

    foreach(var pair in dict)
        Console.WriteLine("Value {0} occurred {1} times.", pair.Key, pair.Value);
    Console.ReadKey();
}

Why does npm install say I have unmet dependencies?

It happened to me when the WIFI went down during an npm install. Removing node_modules and re-running npm install fixed it.

Android Gradle plugin 0.7.0: "duplicate files during packaging of APK"

Same here with

dependencies {
    compile 'org.apache.oltu.oauth2:org.apache.oltu.oauth2.client:1.0.0'
}

packagingOptions {
    exclude 'META-INF/DEPENDENCIES'
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/NOTICE'
}

I lost like 2 days for that weird error... Why is this still happening in gradle 1.0.0 ? That is very disturbing for newbies... Anyway, thanks for that info i thought it was on my code :)

HashMap allows duplicates?

Code example:

HashMap<Integer,String> h = new HashMap<Integer,String> ();

h.put(null,null);
h.put(null, "a");

System.out.println(h);

Output:

{null=a}

It overrides the value at key null.

Qt 5.1.1: Application failed to start because platform plugin "windows" is missing

The release is likely missing a library/plugin or the library is in the wrong directory and or from the wrong directory.

Qt intended answer: Use windeployqt. see last paragraph for explanation

Manual answer:

Create a folder named "platforms" in the same directory as your application.exe file. Copy and paste the qwindows.dll, found in the /bin of whichever compiler you used to release your application, into the "platforms" folder. Like magic it works. If the .dll is not there check plugins/platforms/ ( with plugins/ being in the same directory as bin/ ) <-- PfunnyGuy's comment.

It seems like a common issue is that the .dll was taken from the wrong compiler bin. Be sure to copy your the qwindows.dll from the same compiler as the one used to release your app.

Qt comes with platform console applications that will add all dependencies (including ones like qwindows.dll and libEGL.dll) into the folder of your deployed executable. This is the intended way to deploy your application, so you do not miss any libraries (which is the main issue with all of these answers). The application for windows is called windeployqt. There is likely a deployment console app for each OS.

<select> HTML element with height

I've used a few CSS hacks and targeted Chrome/Safari/Firefox/IE individually, as each browser renders selects a bit differently. I've tested on all browsers except IE.

For Safari/Chrome, set the height and line-height you want for your <select />.

For Firefox, we're going to kill Firefox's default padding and border, then set our own. Set padding to whatever you like.

For IE 8+, just like Chrome, we've set the height and line-height properties. These two media queries can be combined. But I kept it separate for demo purposes. So you can see what I'm doing.

Please note, for the height/line-height property to work in Chrome/Safari OSX, you must set the background to a custom value. I changed the color in my example.

Here's a jsFiddle of the below: http://jsfiddle.net/URgCB/4/

For the non-hack route, why not use a custom select plug-in via jQuery? Check out this: http://codepen.io/wallaceerick/pen/ctsCz

HTML:

<select>
    <option>Here's one option</option>
    <option>here's another option</option>
</select>

CSS:

@media screen and (-webkit-min-device-pixel-ratio:0) {  /*safari and chrome*/
    select {
        height:30px;
        line-height:30px;
        background:#f4f4f4;
    } 
}
select::-moz-focus-inner { /*Remove button padding in FF*/ 
    border: 0;
    padding: 0;
}
@-moz-document url-prefix() { /* targets Firefox only */
    select {
        padding: 15px 0!important;
    }
}        
@media screen\0 { /* IE Hacks: targets IE 8, 9 and 10 */        
    select {
        height:30px;
        line-height:30px;
    }     
}

SQL INSERT INTO from multiple tables

If I'm understanding you correctly, you should be able to do this in one query, joining table1 and table2 together:

INSERT INTO table3 { name, age, sex, city, id, number}
SELECT p.name, p.age, p.sex, p.city, p.id, c.number
FROM table1 p
INNER JOIN table2 c ON c.Id = p.Id

C free(): invalid pointer

You're attempting to free something that isn't a pointer to a "freeable" memory address. Just because something is an address doesn't mean that you need to or should free it.

There are two main types of memory you seem to be confusing - stack memory and heap memory.

  • Stack memory lives in the live span of the function. It's temporary space for things that shouldn't grow too big. When you call the function main, it sets aside some memory for your variables you've declared (p,token, and so on).

  • Heap memory lives from when you malloc it to when you free it. You can use much more heap memory than you can stack memory. You also need to keep track of it - it's not easy like stack memory!

You have a few errors:

  • You're trying to free memory that's not heap memory. Don't do that.

  • You're trying to free the inside of a block of memory. When you have in fact allocated a block of memory, you can only free it from the pointer returned by malloc. That is to say, only from the beginning of the block. You can't free a portion of the block from the inside.

For your bit of code here, you probably want to find a way to copy relevant portion of memory to somewhere else...say another block of memory you've set aside. Or you can modify the original string if you want (hint: char value 0 is the null terminator and tells functions like printf to stop reading the string).

EDIT: The malloc function does allocate heap memory*.

"9.9.1 The malloc and free Functions

The C standard library provides an explicit allocator known as the malloc package. Programs allocate blocks from the heap by calling the malloc function."

~Computer Systems : A Programmer's Perspective, 2nd Edition, Bryant & O'Hallaron, 2011

EDIT 2: * The C standard does not, in fact, specify anything about the heap or the stack. However, for anyone learning on a relevant desktop/laptop machine, the distinction is probably unnecessary and confusing if anything, especially if you're learning about how your program is stored and executed. When you find yourself working on something like an AVR microcontroller as H2CO3 has, it is definitely worthwhile to note all the differences, which from my own experience with embedded systems, extend well past memory allocation.

Linux Script to check if process is running and act on the result

I adopted the @Jotne solution and works perfectly! For example for mongodb server in my NAS

#! /bin/bash

case "$(pidof mongod | wc -w)" in

0)  echo "Restarting mongod:"
    mongod --config mongodb.conf
    ;;
1)  echo "mongod already running"
    ;;
esac

Bootstrap 3: how to make head of dropdown link clickable in navbar

Here is my solution which uses JQuery in your header, and works on Mobile.

On mobile the top links require two taps: one to dropdown the menu and one to go to its link.

_x000D_
_x000D_
$(function(){_x000D_
  $('.dropdown-toggle').click(_x000D_
    function(){_x000D_
      if ($(this).next().is(':visible')) {_x000D_
        location.href = $(this).attr('href');;_x000D_
      }_x000D_
     });_x000D_
  });_x000D_
});
_x000D_
_x000D_
_x000D_

Android - java.lang.SecurityException: Permission Denial: starting Intent

Add android:exported="true" in your 'com.example.lib.MainActivity' activity tag.

From the android:exported documentation,

android:exported Whether or not the activity can be launched by components of other applications — "true" if it can be, and "false" if not. If "false", the activity can be launched only by components of the same application or applications with the same user ID.

From your logcat output, clearly a mismatch in uid is causing the issue. So adding the android:exported="true" should do the trick.

Redirect to a page/URL after alert button is pressed

You're missing semi-colons after your javascript lines. Also, window.location should have .href or .replace etc to redirect - See this post for more information.

echo '<script type="text/javascript">'; 
echo 'alert("review your answer");'; 
echo 'window.location.href = "index.php";';
echo '</script>';

For clarity, try leaving PHP tags for this:

?>
<script type="text/javascript">
alert("review your answer");
window.location.href = "index.php";
</script>
<?php

NOTE: semi colons on seperate lines are optional, but encouraged - however as in the comments below, PHP won't break lines in the first example here but will in the second, so semi-colons are required in the first example.

SQL Left Join first match only

Turns out I was doing it wrong, I needed to perform a nested select first of just the important columns, and do a distinct select off that to prevent trash columns of 'unique' data from corrupting my good data. The following appears to have resolved the issue... but I will try on the full dataset later.

SELECT DISTINCT P2.*
FROM (
  SELECT
      IDNo
    , FirstName
    , LastName
  FROM people P
) P2

Here is some play data as requested: http://sqlfiddle.com/#!3/050e0d/3

CREATE TABLE people
(
       [entry] int
     , [IDNo] varchar(3)
     , [FirstName] varchar(5)
     , [LastName] varchar(7)
);

INSERT INTO people
    (entry,[IDNo], [FirstName], [LastName])
VALUES
    (1,'uqx', 'bob', 'smith'),
    (2,'abc', 'john', 'willis'),
    (3,'ABC', 'john', 'willis'),
    (4,'aBc', 'john', 'willis'),
    (5,'WTF', 'jeff', 'bridges'),
    (6,'Sss', 'bill', 'doe'),
    (7,'sSs', 'bill', 'doe'),
    (8,'ssS', 'bill', 'doe'),
    (9,'ere', 'sally', 'abby'),
    (10,'wtf', 'jeff', 'bridges')
;

Representing Directory & File Structure in Markdown Syntax

There is an NPM module for this:

npm dree

It allows you to have a representation of a directory tree as a string or an object. Using it with the command line will allow you to save the representation in a txt file.

Example:

$ npm dree parse myDirectory --dest ./generated --name tree

How to add header data in XMLHttpRequest when using formdata?

Your error

InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable

appears because you must call setRequestHeader after calling open. Simply move your setRequestHeader line below your open line (but before send):

xmlhttp.open("POST", url);
xmlhttp.setRequestHeader("x-filename", photoId);
xmlhttp.send(formData);

Check if an array contains duplicate values

function checkIfArrayIsUnique(myArray) 
    {
      isUnique=true

        for (var i = 0; i < myArray.length; i++) 
        {
            for (var j = 0; j < myArray.length; j++) 
            {
                if (i != j) 
                {
                    if (myArray[i] == myArray[j]) 
                    {
                        isUnique=false
                    }
                }
            }
        }
        return isUnique;
    }

This assume that the array is unique at the start.

If find two equals values, then change to false

ImportError: No module named Crypto.Cipher

On the mac... if you run into this.. try to see if you can import crypto instead?

If so.. the package name is the issue C vs c. To get around this.. just add these lines to the top of your script.

import crypto
import sys
sys.modules['Crypto'] = crypto

You know should be able to import paramiko successfully.

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

While map is a proper solution to select 'columns' from a list of objects, it has a downside. If not explicitly checked whether or not the columns exists, it'll throw an error and (at best) provide you with undefined. I'd opt for a reduce solution, which can simply ignore the property or even set you up with a default value.

function getFields(list, field) {
    //  reduce the provided list to an array only containing the requested field
    return list.reduce(function(carry, item) {
        //  check if the item is actually an object and does contain the field
        if (typeof item === 'object' && field in item) {
            carry.push(item[field]);
        }

        //  return the 'carry' (which is the list of matched field values)
        return carry;
    }, []);
}

jsbin example

This would work even if one of the items in the provided list is not an object or does not contain the field.

It can even be made more flexible by negotiating a default value should an item not be an object or not contain the field.

function getFields(list, field, otherwise) {
    //  reduce the provided list to an array containing either the requested field or the alternative value
    return list.reduce(function(carry, item) {
        //  If item is an object and contains the field, add its value and the value of otherwise if not
        carry.push(typeof item === 'object' && field in item ? item[field] : otherwise);

        //  return the 'carry' (which is the list of matched field values)
        return carry;
    }, []);
}

jsbin example

This would be the same with map, as the length of the returned array would be the same as the provided array. (In which case a map is slightly cheaper than a reduce):

function getFields(list, field, otherwise) {
    //  map the provided list to an array containing either the requested field or the alternative value
    return list.map(function(item) {
        //  If item is an object and contains the field, add its value and the value of otherwise if not
        return typeof item === 'object' && field in item ? item[field] : otherwise;
    }, []);
}

jsbin example

And then there is the most flexible solution, one which lets you switch between both behaviours simply by providing an alternative value.

function getFields(list, field, otherwise) {
    //  determine once whether or not to use the 'otherwise'
    var alt = typeof otherwise !== 'undefined';

    //  reduce the provided list to an array only containing the requested field
    return list.reduce(function(carry, item) {
        //  If item is an object and contains the field, add its value and the value of 'otherwise' if it was provided
        if (typeof item === 'object' && field in item) {
            carry.push(item[field]);
        }
        else if (alt) {
            carry.push(otherwise);
        }

        //  return the 'carry' (which is the list of matched field values)
        return carry;
    }, []);
}

jsbin example

As the examples above (hopefully) shed some light on the way this works, lets shorten the function a bit by utilising the Array.concat function.

function getFields(list, field, otherwise) {
    var alt = typeof otherwise !== 'undefined';

    return list.reduce(function(carry, item) {
        return carry.concat(typeof item === 'object' && field in item ? item[field] : (alt ? otherwise : []));
    }, []);
}

jsbin example

Select All distinct values in a column using LINQ

I have to find distinct rows with the following details class : Scountry
columns: countryID, countryName,isactive
There is no primary key in this. I have succeeded with the followin queries

public DbSet<SCountry> country { get; set; }
    public List<SCountry> DoDistinct()
    {
        var query = (from m in country group m by new { m.CountryID, m.CountryName, m.isactive } into mygroup select mygroup.FirstOrDefault()).Distinct();
        var Countries = query.ToList().Select(m => new SCountry { CountryID = m.CountryID, CountryName = m.CountryName, isactive = m.isactive }).ToList();
        return Countries;
    }

Bootstrap: Open Another Modal in Modal

For someone who use bootstrap 4 https://jsfiddle.net/helloroy/tmm9juoh/

_x000D_
_x000D_
var modal_lv = 0;_x000D_
$('.modal').on('shown.bs.modal', function (e) {_x000D_
    $('.modal-backdrop:last').css('zIndex',1051+modal_lv);_x000D_
    $(e.currentTarget).css('zIndex',1052+modal_lv);_x000D_
    modal_lv++_x000D_
});_x000D_
_x000D_
$('.modal').on('hidden.bs.modal', function (e) {_x000D_
    modal_lv--_x000D_
});
_x000D_
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js"></script>_x000D_
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js"></script>_x000D_
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" rel="stylesheet"/>_x000D_
_x000D_
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#modal-a">_x000D_
  Launch demo modal a_x000D_
</button>_x000D_
_x000D_
<div class="modal fade" id="modal-a" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">_x000D_
  <div class="modal-dialog" role="document">_x000D_
    <div class="modal-content">_x000D_
      <div class="modal-header">_x000D_
        <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>_x000D_
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">_x000D_
          <span aria-hidden="true">&times;</span>_x000D_
        </button>_x000D_
      </div>_x000D_
      <div class="modal-body">_x000D_
        <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#modal-b">_x000D_
  Launch another demo modal b_x000D_
</button>_x000D_
<p class="my-3">_x000D_
Not good for fade In._x000D_
</p>_x000D_
<p class="my-3">_x000D_
who help to improve?_x000D_
</p>_x000D_
      </div>_x000D_
      <div class="modal-footer">_x000D_
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>_x000D_
        <button type="button" class="btn btn-primary">Save changes</button>_x000D_
      </div>_x000D_
    </div>_x000D_
  </div>_x000D_
</div>_x000D_
_x000D_
<div class="modal fade" id="modal-b" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">_x000D_
  <div class="modal-dialog" role="document">_x000D_
    <div class="modal-content">_x000D_
      <div class="modal-header">_x000D_
        <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>_x000D_
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">_x000D_
          <span aria-hidden="true">&times;</span>_x000D_
        </button>_x000D_
      </div>_x000D_
      <div class="modal-body">_x000D_
        <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#modal-c">_x000D_
  Launch another demo modal c_x000D_
</button>_x000D_
<p class="my-3">_x000D_
But good enough for static modal_x000D_
</p>_x000D_
      </div>_x000D_
      <div class="modal-footer">_x000D_
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>_x000D_
        <button type="button" class="btn btn-primary">Save changes</button>_x000D_
      </div>_x000D_
    </div>_x000D_
  </div>_x000D_
</div>_x000D_
_x000D_
_x000D_
<div class="modal" id="modal-c" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">_x000D_
  <div class="modal-dialog" role="document">_x000D_
    <div class="modal-content">_x000D_
      <div class="modal-header">_x000D_
        <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>_x000D_
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">_x000D_
          <span aria-hidden="true">&times;</span>_x000D_
        </button>_x000D_
      </div>_x000D_
      <div class="modal-body">_x000D_
<p class="my-3">That's all.</p>_x000D_
      </div>_x000D_
      <div class="modal-footer">_x000D_
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>_x000D_
        <button type="button" class="btn btn-primary">Save changes</button>_x000D_
      </div>_x000D_
    </div>_x000D_
  </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

How to align matching values in two columns in Excel, and bring along associated values in other columns

assuming the item numbers are unique, a VLOOKUP should get you the information you need.

first value would be =VLOOKUP(E1,A:B,2,FALSE), and the same type of formula to retrieve the second value would be =VLOOKUP(E1,C:D,2,FALSE). Wrap them in an IFERROR if you want to return anything other than #N/A if there is no corresponding value in the item column(s)

How do I use SELECT GROUP BY in DataTable.Select(Expression)?

dt.AsEnumerable()
    .GroupBy(r => new { Col1 = r["Col1"], Col2 = r["Col2"] })
    .Select(g =>
    {
        var row = dt.NewRow();

        row["PK"] = g.Min(r => r.Field<int>("PK"));
        row["Col1"] = g.Key.Col1;
        row["Col2"] = g.Key.Col2;

        return row;

    })
    .CopyToDataTable();

How to count duplicate value in an array in javascript

Simple is better, one variable, one function :)

const counts = arr.reduce((acc, value) => ({
   ...acc,
   [value]: (acc[value] || 0) + 1
}), {});

How do I add to the Windows PATH variable using setx? Having weird problems

I was facing the same problems and found a easy solution now.

Using pathman.

pathman /as %M2%

Adds for example %M2% to the system path. Nothing more and nothing less. No more problems getting a mixture of user PATH and system PATH. No more hardly trying to get the correct values from registry...

Tried at Windows 10

if (boolean condition) in Java

if (turnedOn) {
    //do stuff when the condition is false or true?
}
else {
    //do else of if
}

It can be written like:

if (turnedOn == true) {
        //do stuff when the condition is false or true?
    }
else { // turnedOn == false or !turnedOn
        //do else of if
}

So if your turnedOn variable is true, if will be called, if is assigned to false, else will be called. boolean values are implicitly assigned to false if you won't assign them explicitly e.q. turnedOn = true

Pandas Merge - How to avoid duplicating columns

I'm freshly new with Pandas but I wanted to achieve the same thing, automatically avoiding column names with _x or _y and removing duplicate data. I finally did it by using this answer and this one from Stackoverflow

sales.csv

    city;state;units
    Mendocino;CA;1
    Denver;CO;4
    Austin;TX;2

revenue.csv

    branch_id;city;revenue;state_id
    10;Austin;100;TX
    20;Austin;83;TX
    30;Austin;4;TX
    47;Austin;200;TX
    20;Denver;83;CO
    30;Springfield;4;I

merge.py import pandas

def drop_y(df):
    # list comprehension of the cols that end with '_y'
    to_drop = [x for x in df if x.endswith('_y')]
    df.drop(to_drop, axis=1, inplace=True)


sales = pandas.read_csv('data/sales.csv', delimiter=';')
revenue = pandas.read_csv('data/revenue.csv', delimiter=';')

result = pandas.merge(sales, revenue,  how='inner', left_on=['state'], right_on=['state_id'], suffixes=('', '_y'))
drop_y(result)
result.to_csv('results/output.csv', index=True, index_label='id', sep=';')

When executing the merge command I replace the _x suffix with an empty string and them I can remove columns ending with _y

output.csv

    id;city;state;units;branch_id;revenue;state_id
    0;Denver;CO;4;20;83;CO
    1;Austin;TX;2;10;100;TX
    2;Austin;TX;2;20;83;TX
    3;Austin;TX;2;30;4;TX
    4;Austin;TX;2;47;200;TX

How to use Git Revert

The reason reset and revert tend to come up a lot in the same conversations is because different version control systems use them to mean different things.

In particular, people who are used to SVN or P4 who want to throw away uncommitted changes to a file will often reach for revert before being told that they actually want reset.

Similarly, the revert equivalent in other VCSes is often called rollback or something similar - but "rollback" can also mean "I want to completely discard the last few commits", which is appropriate for reset but not revert. So, there's a lot of confusion where people know what they want to do, but aren't clear on which command they should be using for it.

As for your actual questions about revert...

Okay, you're going to use git revert but how?

git revert first-bad-commit..last-bad-commit

And after running git revert do you have to do something else after? Do you have to commit the changes revert made or does revert directly commit to the repo or what??

By default, git revert prompts you for a commit message and then commits the results. This can be overridden. I quote the man page:

--edit

With this option, git revert will let you edit the commit message prior to committing the revert. This is the default if you run the command from a terminal.

--no-commit

Usually the command automatically creates some commits with commit log messages stating which commits were reverted. This flag applies the changes necessary to revert the named commits to your working tree and the index, but does not make the commits. In addition, when this option is used, your index does not have to match the HEAD commit. The revert is done against the beginning state of your index.

This is useful when reverting more than one commits' effect to your index in a row.

In particular, by default it creates a new commit for each commit you're reverting. You can use revert --no-commit to create changes reverting all of them without committing those changes as individual commits, then commit at your leisure.

error: Libtool library used but 'LIBTOOL' is undefined

For people using Tiny Core Linux, you also need to install libtool-dev as it has the *.m4 files needed for libtoolize.

How to include duplicate keys in HashMap?

You can't have duplicate keys in a Map. You can rather create a Map<Key, List<Value>>, or if you can, use Guava's Multimap.

Multimap<Integer, String> multimap = ArrayListMultimap.create();
multimap.put(1, "rohit");
multimap.put(1, "jain");

System.out.println(multimap.get(1));  // Prints - [rohit, jain]

And then you can get the java.util.Map using the Multimap#asMap() method.

MySQL CREATE TABLE IF NOT EXISTS in PHPmyadmin import

If you really want to insert this record, remove the `abuse_id` field and the corresponding value from the INSERTstatement :

INSERT INTO  `abuses` (  `user_id` ,  `abuser_username` ,  `comment` ,  `reg_date` , `auction_id` ) 
VALUES ( 100020,  'artictundra', 'I placed a bid for it more than an hour ago. It is still active. I thought I was supposed to get an email after 15 minutes.', 1338052850, 108625 ) ;

SQL: Group by minimum value in one field while selecting distinct rows

If record_date has no duplicates within a group:

think of it as of filtering. Simpliy get (WHERE) one (MIN(record_date)) row from the current group:

SELECT * FROM t t1 WHERE record_date = (
                                 select MIN(record_date)
                                 from t t2 where t2.group_id = t1.group_id)

If there could be 2+ min record_date within a group:

  1. filter out non-min rows (see above)

  2. then (AND) pick only one from the 2+ min record_date rows, within the given group_id. E.g. pick the one with the min unique key:

                    AND key_id = (select MIN(key_id)
                                  from t t3 where t3.record_date = t1.record_date
                                              and t3.group_id    = t1.group_id)
    

so

key_id | group_id | record_date | other_cols
1      | 18       | 2011-04-03  | x
4      | 19       | 2009-06-01  | a
8      | 19       | 2009-06-01  | e

will select key_ids: #1 and #4

Syntax error "syntax error, unexpected end-of-input, expecting keyword_end (SyntaxError)"

Just posting in case it help someone else. The cause of this error for me was a missing do after creating a form with form_with. Hope that may help someone else

Pandas aggregate count distinct

How about either of:

>>> df
         date  duration user_id
0  2013-04-01        30    0001
1  2013-04-01        15    0001
2  2013-04-01        20    0002
3  2013-04-02        15    0002
4  2013-04-02        30    0002
>>> df.groupby("date").agg({"duration": np.sum, "user_id": pd.Series.nunique})
            duration  user_id
date                         
2013-04-01        65        2
2013-04-02        45        1
>>> df.groupby("date").agg({"duration": np.sum, "user_id": lambda x: x.nunique()})
            duration  user_id
date                         
2013-04-01        65        2
2013-04-02        45        1

C# LINQ find duplicates in List

You can do this:

var list = new[] {1,2,3,1,4,2};
var duplicateItems = list.Duplicates();

With these extension methods:

public static class Extensions
{
    public static IEnumerable<TSource> Duplicates<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> selector)
    {
        var grouped = source.GroupBy(selector);
        var moreThan1 = grouped.Where(i => i.IsMultiple());
        return moreThan1.SelectMany(i => i);
    }

    public static IEnumerable<TSource> Duplicates<TSource, TKey>(this IEnumerable<TSource> source)
    {
        return source.Duplicates(i => i);
    }

    public static bool IsMultiple<T>(this IEnumerable<T> source)
    {
        var enumerator = source.GetEnumerator();
        return enumerator.MoveNext() && enumerator.MoveNext();
    }
}

Using IsMultiple() in the Duplicates method is faster than Count() because this does not iterate the whole collection.

How to delete duplicate rows in SQL Server?

It can be done by many ways in sql server the most simplest way to do so is: Insert the distinct rows from the duplicate rows table to new temporary table. Then delete all the data from duplicate rows table then insert all data from temporary table which has no duplicates as shown below.

select distinct * into #tmp From table
   delete from table
   insert into table
   select * from #tmp drop table #tmp

   select * from table

Delete duplicate rows using Common Table Expression(CTE)

With CTE_Duplicates as 
(select id,name , row_number() 
over(partition by id,name order by id,name ) rownumber  from table  ) 
delete from CTE_Duplicates where rownumber!=1

Python copy files to a new directory and rename if file name already exists

For me shutil.copy is the best:

import shutil

#make a copy of the invoice to work with
src="invoice.pdf"
dst="copied_invoice.pdf"
shutil.copy(src,dst)

You can change the path of the files as you want.

How to delete a certain row from mysql table with same column values?

There are already answers for Deleting row by LIMIT. Ideally you should have primary key in your table. But if there is not.

I will give other ways:

  1. By creating Unique index

I see id_users and id_product should be unique in your example.

ALTER IGNORE TABLE orders ADD UNIQUE INDEX unique_columns_index (id_users, id_product)

These will delete duplicate rows with same data.

But if you still get an error, even if you use IGNORE clause, try this:

ALTER TABLE orders ENGINE MyISAM;
ALTER IGNORE TABLE orders ADD UNIQUE INDEX unique_columns_index (id_users, id_product)
ALTER TABLE orders ENGINE InnoDB; 
  1. By creating table again

If there are multiple rows who have duplicate values, then you can also recreate table

RENAME TABLE `orders` TO `orders2`;

CREATE TABLE `orders` 
SELECT * FROM `orders2` GROUP BY id_users, id_product;

JavaScript string encryption and decryption?

I created an insecure but simple text cipher/decipher util. No dependencies with any external library.

These are the functions

const cipher = salt => {
    const textToChars = text => text.split('').map(c => c.charCodeAt(0));
    const byteHex = n => ("0" + Number(n).toString(16)).substr(-2);
    const applySaltToChar = code => textToChars(salt).reduce((a,b) => a ^ b, code);

    return text => text.split('')
        .map(textToChars)
        .map(applySaltToChar)
        .map(byteHex)
        .join('');
}

const decipher = salt => {
    const textToChars = text => text.split('').map(c => c.charCodeAt(0));
    const applySaltToChar = code => textToChars(salt).reduce((a,b) => a ^ b, code);
    return encoded => encoded.match(/.{1,2}/g)
        .map(hex => parseInt(hex, 16))
        .map(applySaltToChar)
        .map(charCode => String.fromCharCode(charCode))
        .join('');
}

And you can use them as follows:

// To create a cipher
const myCipher = cipher('mySecretSalt')

//Then cipher any text:
myCipher('the secret string')   // --> "7c606d287b6d6b7a6d7c287b7c7a61666f"

//To decipher, you need to create a decipher and use it:
const myDecipher = decipher('mySecretSalt')
myDecipher("7c606d287b6d6b7a6d7c287b7c7a61666f")    // --> 'the secret string'

SimpleDateFormat parse loses timezone

OP's solution to his problem, as he says, has dubious output. That code still shows confusion about representations of time. To clear up this confusion, and make code that won't lead to wrong times, consider this extension of what he did:

public static void _testDateFormatting() {
    SimpleDateFormat sdfGMT1 = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss");
    sdfGMT1.setTimeZone(TimeZone.getTimeZone("GMT"));
    SimpleDateFormat sdfGMT2 = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss z");
    sdfGMT2.setTimeZone(TimeZone.getTimeZone("GMT"));

    SimpleDateFormat sdfLocal1 = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss");
    SimpleDateFormat sdfLocal2 = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss z");

    try {
        Date d = new Date();
        String s1 = d.toString();
        String s2 = sdfLocal1.format(d);
        // Store s3 or s4 in database.
        String s3 = sdfGMT1.format(d);
        String s4 = sdfGMT2.format(d);
        // Retrieve s3 or s4 from database, using LOCAL sdf.
        String s5 = sdfLocal1.parse(s3).toString();
        //EXCEPTION String s6 = sdfLocal2.parse(s3).toString();
        String s7 = sdfLocal1.parse(s4).toString();
        String s8 = sdfLocal2.parse(s4).toString();
        // Retrieve s3 from database, using GMT sdf.
        // Note that this is the SAME sdf that created s3.
        Date d2 = sdfGMT1.parse(s3);
        String s9 = d2.toString();
        String s10 = sdfGMT1.format(d2);
        String s11 = sdfLocal2.format(d2);
    } catch (Exception e) {
        e.printStackTrace();
    }       
}

examining values in a debugger:

s1  "Mon Sep 07 06:11:53 EDT 2015" (id=831698113128)    
s2  "2015.09.07 06:11:53" (id=831698114048) 
s3  "2015.09.07 10:11:53" (id=831698114968) 
s4  "2015.09.07 10:11:53 GMT+00:00" (id=831698116112)   
s5  "Mon Sep 07 10:11:53 EDT 2015" (id=831698116944)    
s6  -- omitted, gave parse exception    
s7  "Mon Sep 07 10:11:53 EDT 2015" (id=831698118680)    
s8  "Mon Sep 07 06:11:53 EDT 2015" (id=831698119584)    
s9  "Mon Sep 07 06:11:53 EDT 2015" (id=831698120392)    
s10 "2015.09.07 10:11:53" (id=831698121312) 
s11 "2015.09.07 06:11:53 EDT" (id=831698122256) 

sdf2 and sdfLocal2 include time zone, so we can see what is really going on. s1 & s2 are at 06:11:53 in zone EDT. s3 & s4 are at 10:11:53 in zone GMT -- equivalent to the original EDT time. Imagine we save s3 or s4 in a data base, where we are using GMT for consistency, so we can have times from anywhere in the world, without storing different time zones.

s5 parses the GMT time, but treats it as a local time. So it says "10:11:53" -- the GMT time -- but thinks it is 10:11:53 in local time. Not good.

s7 parses the GMT time, but ignores the GMT in the string, so still treats it as a local time.

s8 works, because now we include GMT in the string, and the local zone parser uses it to convert from one time zone to another.

Now suppose you don't want to store the zone, you want to be able to parse s3, but display it as a local time. The answer is to parse using the same time zone it was stored in -- so use the same sdf as it was created in, sdfGMT1. s9, s10, & s11 are all representations of the original time. They are all "correct". That is, d2 == d1. Then it is only a question of how you want to DISPLAY it. If you want to display what is stored in DB -- GMT time -- then you need to format it using a GMT sdf. Ths is s10.

So here is the final solution, if you don't want to explicitly store with " GMT" in the string, and want to display in GMT format:

public static void _testDateFormatting() {
    SimpleDateFormat sdfGMT1 = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss");
    sdfGMT1.setTimeZone(TimeZone.getTimeZone("GMT"));

    try {
        Date d = new Date();
        String s3 = sdfGMT1.format(d);
        // Store s3 in DB.
        // ...
        // Retrieve s3 from database, using GMT sdf.
        Date d2 = sdfGMT1.parse(s3);
        String s10 = sdfGMT1.format(d2);
    } catch (Exception e) {
        e.printStackTrace();
    }       
}

Kill process by name?

you can use WMI module to do this on windows, though it's a lot clunkier than you unix folks are used to; import WMI takes a long time and there's intermediate pain to get at the process.

How can I store HashMap<String, ArrayList<String>> inside a list?

Always try to use interface reference in Collection, this adds more flexibility.
What is the problem with the below code?

List<Map<String,List<String>>> list = new ArrayList<Map<String,List<String>>>();//This is the final list you need
Map<String, List<String>> map1 = new HashMap<String, List<String>>();//This is one instance of the  map you want to store in the above list.
List<String> arraylist1 = new ArrayList<String>();
arraylist1.add("Text1");//And so on..
map1.put("key1",arraylist1);
//And so on...
list.add(map1);//In this way you can add.

You can easily do it like the above.

How can we print line numbers to the log in java

The stackLevel depends on depth you call this method. You can try from 0 to a large number to see what difference.

If stackLevel is legal, you will get string like java.lang.Thread.getStackTrace(Thread.java:1536)

public static String getCodeLocationInfo(int stackLevel) {
        StackTraceElement[] stackTraceElements = Thread.currentThread().getStackTrace();
        if (stackLevel < 0 || stackLevel >= stackTraceElements.length) {
            return "Stack Level Out Of StackTrace Bounds";
        }
        StackTraceElement stackTraceElement = stackTraceElements[stackLevel];
        String fullClassName = stackTraceElement.getClassName();
        String methodName = stackTraceElement.getMethodName();
        String fileName = stackTraceElement.getFileName();
        int lineNumber = stackTraceElement.getLineNumber();

        return String.format("%s.%s(%s:%s)", fullClassName, methodName, fileName, lineNumber);
}

inline if statement java, why is not working

(inline if) in java won't work if you are using 'if' statement .. the right syntax is in the following example:

int y = (c == 19) ? 7 : 11 ; 

or

String y = (s > 120) ? "Slow Down" : "Safe";
System.out.println(y);

as You can see the type of the variable Y is the same as the return value ...

in your case it is better to use the normal if statement not inline if as it is in the pervious answer without "?"

if (compareChar(curChar, toChar("0"))) getButtons().get(i).setText("§");

How to convert index of a pandas dataframe into a column?

If you want to use the reset_index method and also preserve your existing index you should use:

df.reset_index().set_index('index', drop=False)

or to change it in place:

df.reset_index(inplace=True)
df.set_index('index', drop=False, inplace=True)

For example:

print(df)
          gi  ptt_loc
0  384444683      593
4  384444684      594
9  384444686      596

print(df.reset_index())
   index         gi  ptt_loc
0      0  384444683      593
1      4  384444684      594
2      9  384444686      596

print(df.reset_index().set_index('index', drop=False))
       index         gi  ptt_loc
index
0          0  384444683      593
4          4  384444684      594
9          9  384444686      596

And if you want to get rid of the index label you can do:

df2 = df.reset_index().set_index('index', drop=False)
df2.index.name = None
print(df2)
   index         gi  ptt_loc
0      0  384444683      593
4      4  384444684      594
9      9  384444686      596

How to preSelect an html dropdown list with php?

I suppose that you are using an array to create your select form input. In that case, use an array:

<?php
    $selected = array( $_REQUEST['yesnofine'] => 'selected="selected"' );
    $fields = array(1 => 'Yes', 2 => 'No', 3 => 'Fine');
 ?>
  <select name=‘yesnofine'>
 <?php foreach ($fields as $k => $v): ?>
  <option value="<?php echo $k;?>" <?php @print($selected[$k]);?>><?php echo $v;?></options>
 <?php endforeach; ?>
 </select>

If not, you may just unroll the above loop, and still use an array.

 <option value="1" <?php @print($selected[$k]);?>>Yes</options>
 <option value="2" <?php @print($selected[$k]);?>>No</options>
 <option value="3" <?php @print($selected[$k]);?>>Fine</options>

Notes that I don't know:

  • how you are naming your input, so I made up a name for it.
  • which way you are handling your form input on server side, I used $_REQUEST,

You will have to adapt the code to match requirements of the framework you are using, if any.

Also, it is customary in many frameworks to use the alternative syntax in view dedicated scripts.

Calculate percentage saved between two numbers?

((list price - actual price) / (list price)) * 100%

For example:

((25 - 10) / 25) * 100% = 60%

Creating a config file in PHP

Define will make the constant available everywhere in your class without needing to use global, while the variable requires global in the class, I would use DEFINE. but again, if the db params should change during program execution you might want to stick with variable.

Android: how do I check if activity is running?

If you are interested in the lifecycle state of the specific instance of the activity, siliconeagle's solution looks correct except that the new "active" variable should be an instance variable, rather than static.

Convert datetime value into string

This is super old, but I figured I'd add my 2c. DATE_FORMAT does indeed return a string, but I was looking for the CAST function, in the situation that I already had a datetime string in the database and needed to pattern match against it:

http://dev.mysql.com/doc/refman/5.0/en/cast-functions.html

In this case, you'd use:

CAST(date_value AS char)

This answers a slightly different question, but the question title seems ambiguous enough that this might help someone searching.

`col-xs-*` not working in Bootstrap 4

I just wondered, why col-xs-6 did not work for me but then I found the answer in the Bootstrap 4 documentation. The class prefix for extra small devices is now col- while in the previous versions it was col-xs.

https://getbootstrap.com/docs/4.1/layout/grid/#grid-options

Bootstrap 4 dropped all col-xs-* classes, so use col-* instead. For example col-xs-6 replaced by col-6.

How to repeat last command in python interpreter shell?

This can happen when you run python script.py vs just python to enter the interactive shell, among other reasons for readline being disabled.

Try:

import readline

How to set UICollectionViewCell Width and Height programmatically

Swift 5 Programmatically

lazy var collectionView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        layout.scrollDirection = .horizontal

        //Provide Width and Height According to your need
        let cellWidth = UIScreen.main.bounds.width / 10
        let cellHeight = UIScreen.main.bounds.height / 10
        layout.itemSize = CGSize(width: cellWidth, height: cellHeight)

        //You can also provide estimated Height and Width
        layout.estimatedItemSize = CGSize(width: cellWidth, height: cellHeight)

        //For Setting the Spacing between cells
        layout.minimumInteritemSpacing = 0
        layout.minimumLineSpacing = 0

        return UICollectionView(frame: self.view.frame, collectionViewLayout: layout)
    }()

adding css file with jquery

Try doing it the other way around.

$('<link rel="stylesheet" href="css/style2.css" type="text/css" />').appendTo('head');

Validating URL in Java

Just important to point that the URL object handle both validation and connection. Then, only protocols for which a handler has been provided in sun.net.www.protocol are authorized (file, ftp, gopher, http, https, jar, mailto, netdoc) are valid ones. For instance, try to make a new URL with the ldap protocol:

new URL("ldap://myhost:389")

You will get a java.net.MalformedURLException: unknown protocol: ldap.

You need to implement your own handler and register it through URL.setURLStreamHandlerFactory(). Quite overkill if you just want to validate the URL syntax, a regexp seems to be a simpler solution.

Calculate days between two Dates in Java 8

Everyone is saying to use ChronoUnit.DAYS.between but that just delegates to another method you could call yourself. So you could also do firstDate.until(secondDate, ChronoUnit.DAYS).

The docs for both actually mention both approaches and say to use whichever one is more readable.

How to 'grep' a continuous stream?

Turn on grep's line buffering mode when using BSD grep (FreeBSD, Mac OS X etc.)

tail -f file | grep --line-buffered my_pattern

It looks like a while ago --line-buffered didn't matter for GNU grep (used on pretty much any Linux) as it flushed by default (YMMV for other Unix-likes such as SmartOS, AIX or QNX). However, as of November 2020, --line-buffered is needed (at least with GNU grep 3.5 in openSUSE, but it seems generally needed based on comments below).

Check if passed argument is file or directory in Bash

This should work:

#!/bin/bash

echo "Enter your Path:"
read a

if [[ -d $a ]]; then 
    echo "$a is a Dir" 
elif [[ -f $a ]]; then 
    echo "$a is the File" 
else 
    echo "Invalid path" 
fi

Find all matches in workbook using Excel VBA

Based on the idea of B Hart's answer, here's my version of a function that searches for a value in a range, and returns all found ranges (cells):

Function FindAll(ByVal rng As Range, ByVal searchTxt As String) As Range
    Dim foundCell As Range
    Dim firstAddress
    Dim rResult As Range
    With rng
        Set foundCell = .Find(What:=searchTxt, _
                              After:=.Cells(.Cells.Count), _
                              LookIn:=xlValues, _
                              LookAt:=xlWhole, _
                              SearchOrder:=xlByRows, _
                              SearchDirection:=xlNext, _
                              MatchCase:=False)
        If Not foundCell Is Nothing Then
            firstAddress = foundCell.Address
            Do
                If rResult Is Nothing Then
                    Set rResult = foundCell
                Else
                    Set rResult = Union(rResult, foundCell)
                End If
                Set foundCell = .FindNext(foundCell)
            Loop While Not foundCell Is Nothing And foundCell.Address <> firstAddress
        End If
    End With

    Set FindAll = rResult
End Function

To search for a value in the whole workbook:

Dim wSh As Worksheet
Dim foundCells As Range
For Each wSh In ThisWorkbook.Worksheets
    Set foundCells = FindAll(wSh.UsedRange, "YourSearchString")
    If Not foundCells Is Nothing Then
        Debug.Print ("Results in sheet '" & wSh.Name & "':")
        Dim cell As Range
        For Each cell In foundCells
            Debug.Print ("The value has been found in cell: " & cell.Address)
        Next
    End If
Next

How can I get the last day of the month in C#?

try this. It will solve your problem.

 var lastDayOfMonth = DateTime.DaysInMonth(int.Parse(ddlyear.SelectedValue), int.Parse(ddlmonth.SelectedValue));
DateTime tLastDayMonth = Convert.ToDateTime(lastDayOfMonth.ToString() + "/" + ddlmonth.SelectedValue + "/" + ddlyear.SelectedValue);

How to split a dos path into its components in Python

I'm not actually sure if this fully answers the question, but I had a fun time writing this little function that keeps a stack, sticks to os.path-based manipulations, and returns the list/stack of items.

def components(path):
    ret = []
    while len(path) > 0:
        path, crust = split(path)
        ret.insert(0, crust)
    return ret

Spring boot - configure EntityManager

Hmmm you can find lot of examples for configuring spring framework. Anyways here is a sample

@Configuration
@Import({PersistenceConfig.class})
@ComponentScan(basePackageClasses = { 
    ServiceMarker.class,
    RepositoryMarker.class }
)
public class AppConfig {

}

PersistenceConfig

@Configuration
@PropertySource(value = { "classpath:database/jdbc.properties" })
@EnableTransactionManagement
public class PersistenceConfig {

    private static final String PROPERTY_NAME_HIBERNATE_DIALECT = "hibernate.dialect";
    private static final String PROPERTY_NAME_HIBERNATE_MAX_FETCH_DEPTH = "hibernate.max_fetch_depth";
    private static final String PROPERTY_NAME_HIBERNATE_JDBC_FETCH_SIZE = "hibernate.jdbc.fetch_size";
    private static final String PROPERTY_NAME_HIBERNATE_JDBC_BATCH_SIZE = "hibernate.jdbc.batch_size";
    private static final String PROPERTY_NAME_HIBERNATE_SHOW_SQL = "hibernate.show_sql";
    private static final String[] ENTITYMANAGER_PACKAGES_TO_SCAN = {"a.b.c.entities", "a.b.c.converters"};

    @Autowired
    private Environment env;

     @Bean(destroyMethod = "close")
     public DataSource dataSource() {
         BasicDataSource dataSource = new BasicDataSource();
         dataSource.setDriverClassName(env.getProperty("jdbc.driverClassName"));
         dataSource.setUrl(env.getProperty("jdbc.url"));
         dataSource.setUsername(env.getProperty("jdbc.username"));
         dataSource.setPassword(env.getProperty("jdbc.password"));
         return dataSource;
     }

     @Bean
     public JpaTransactionManager jpaTransactionManager() {
         JpaTransactionManager transactionManager = new JpaTransactionManager();
         transactionManager.setEntityManagerFactory(entityManagerFactoryBean().getObject());
         return transactionManager;
     }

    private HibernateJpaVendorAdapter vendorAdaptor() {
         HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
         vendorAdapter.setShowSql(true);
         return vendorAdapter;
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean() {

         LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
         entityManagerFactoryBean.setJpaVendorAdapter(vendorAdaptor());
         entityManagerFactoryBean.setDataSource(dataSource());
         entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);
         entityManagerFactoryBean.setPackagesToScan(ENTITYMANAGER_PACKAGES_TO_SCAN);             
         entityManagerFactoryBean.setJpaProperties(jpaHibernateProperties());

         return entityManagerFactoryBean;
     }

     private Properties jpaHibernateProperties() {

         Properties properties = new Properties();

         properties.put(PROPERTY_NAME_HIBERNATE_MAX_FETCH_DEPTH, env.getProperty(PROPERTY_NAME_HIBERNATE_MAX_FETCH_DEPTH));
         properties.put(PROPERTY_NAME_HIBERNATE_JDBC_FETCH_SIZE, env.getProperty(PROPERTY_NAME_HIBERNATE_JDBC_FETCH_SIZE));
         properties.put(PROPERTY_NAME_HIBERNATE_JDBC_BATCH_SIZE, env.getProperty(PROPERTY_NAME_HIBERNATE_JDBC_BATCH_SIZE));
         properties.put(PROPERTY_NAME_HIBERNATE_SHOW_SQL, env.getProperty(PROPERTY_NAME_HIBERNATE_SHOW_SQL));

         properties.put(AvailableSettings.SCHEMA_GEN_DATABASE_ACTION, "none");
         properties.put(AvailableSettings.USE_CLASS_ENHANCER, "false");      
         return properties;       
     }

}

Main

public static void main(String[] args) { 
    try (GenericApplicationContext springContext = new AnnotationConfigApplicationContext(AppConfig.class)) {
        MyService myService = springContext.getBean(MyServiceImpl.class);
        try {
            myService.handleProcess(fromDate, toDate);
        } catch (Exception e) {
            logger.error("Exception occurs", e);
            myService.handleException(fromDate, toDate, e);
        }
    } catch (Exception e) {
        logger.error("Exception occurs in loading Spring context: ", e);
    }
}

MyService

@Service
public class MyServiceImpl implements MyService {

    @Inject
    private MyDao myDao;

    @Override
    public void handleProcess(String fromDate, String toDate) {
        List<Student> myList = myDao.select(fromDate, toDate);
    }
}

MyDaoImpl

@Repository
@Transactional
public class MyDaoImpl implements MyDao {

    @PersistenceContext
    private EntityManager entityManager;

    public Student select(String fromDate, String toDate){

        TypedQuery<Student> query = entityManager.createNamedQuery("Student.findByKey", Student.class);
        query.setParameter("fromDate", fromDate);
        query.setParameter("toDate", toDate);
        List<Student> list = query.getResultList();
        return CollectionUtils.isEmpty(list) ? null : list;
    }

}

Assuming maven project: Properties file should be in src/main/resources/database folder

jdbc.properties file

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=your db url
jdbc.username=your Username
jdbc.password=Your password

hibernate.max_fetch_depth = 3
hibernate.jdbc.fetch_size = 50
hibernate.jdbc.batch_size = 10
hibernate.show_sql = true

ServiceMarker and RepositoryMarker are just empty interfaces in your service or repository impl package.

Let's say you have package name a.b.c.service.impl. MyServiceImpl is in this package and so is ServiceMarker.

public interface ServiceMarker {

}

Same for repository marker. Let's say you have a.b.c.repository.impl or a.b.c.dao.impl package name. Then MyDaoImpl is in this this package and also Repositorymarker

public interface RepositoryMarker {

}

a.b.c.entities.Student

//dummy class and dummy query
@Entity
@NamedQueries({
@NamedQuery(name="Student.findByKey", query="select s from Student s where s.fromDate=:fromDate" and s.toDate = :toDate)
})
public class Student implements Serializable {

    private LocalDateTime fromDate;
    private LocalDateTime toDate;

    //getters setters

}

a.b.c.converters

@Converter(autoApply = true)
public class LocalDateTimeConverter implements AttributeConverter<LocalDateTime, Timestamp> {

    @Override
    public Timestamp convertToDatabaseColumn(LocalDateTime dateTime) {

        if (dateTime == null) {
            return null;
        }
        return Timestamp.valueOf(dateTime);
    }

    @Override
    public LocalDateTime convertToEntityAttribute(Timestamp timestamp) {

        if (timestamp == null) {
            return null;
        }    
        return timestamp.toLocalDateTime();
    }
}

pom.xml

<properties>
    <java-version>1.8</java-version>
    <org.springframework-version>4.2.1.RELEASE</org.springframework-version>
    <hibernate-entitymanager.version>5.0.2.Final</hibernate-entitymanager.version>
    <commons-dbcp2.version>2.1.1</commons-dbcp2.version>
    <mysql-connector-java.version>5.1.36</mysql-connector-java.version>
     <junit.version>4.12</junit.version> 
</properties>

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>${junit.version}</version>
        <scope>test</scope>
    </dependency>

    <!-- Spring -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>

    <dependency>
        <groupId>javax.inject</groupId>
        <artifactId>javax.inject</artifactId>
        <version>1</version>
        <scope>compile</scope>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>${org.springframework-version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>${org.springframework-version}</version>
    </dependency>

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>${hibernate-entitymanager.version}</version>
    </dependency>

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql-connector-java.version}</version>
    </dependency>

    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-dbcp2</artifactId>
        <version>${commons-dbcp2.version}</version>
    </dependency>
</dependencies>

<build>
     <finalName>${project.artifactId}</finalName>
     <plugins>
         <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.3</version>
            <configuration>
                <source>${java-version}</source>
                <target>${java-version}</target>
                <compilerArgument>-Xlint:all</compilerArgument>
                <showWarnings>true</showWarnings>
                <showDeprecation>true</showDeprecation>
            </configuration>
        </plugin>
     </plugins>
</build>

Hope it helps. Thanks

C++ equivalent of java's instanceof

Try using:

if(NewType* v = dynamic_cast<NewType*>(old)) {
   // old was safely casted to NewType
   v->doSomething();
}

This requires your compiler to have rtti support enabled.

EDIT: I've had some good comments on this answer!

Every time you need to use a dynamic_cast (or instanceof) you'd better ask yourself whether it's a necessary thing. It's generally a sign of poor design.

Typical workarounds is putting the special behaviour for the class you are checking for into a virtual function on the base class or perhaps introducing something like a visitor where you can introduce specific behaviour for subclasses without changing the interface (except for adding the visitor acceptance interface of course).

As pointed out dynamic_cast doesn't come for free. A simple and consistently performing hack that handles most (but not all cases) is basically adding an enum representing all the possible types your class can have and check whether you got the right one.

if(old->getType() == BOX) {
   Box* box = static_cast<Box*>(old);
   // Do something box specific
}

This is not good oo design, but it can be a workaround and its cost is more or less only a virtual function call. It also works regardless of RTTI is enabled or not.

Note that this approach doesn't support multiple levels of inheritance so if you're not careful you might end with code looking like this:

// Here we have a SpecialBox class that inherits Box, since it has its own type
// we must check for both BOX or SPECIAL_BOX
if(old->getType() == BOX || old->getType() == SPECIAL_BOX) {
   Box* box = static_cast<Box*>(old);
   // Do something box specific
}

How to fix Terminal not loading ~/.bashrc on OS X Lion

Renaming .bashrc to .profile (or soft-linking the latter to the former) should also do the trick. See here.

How to create radio buttons and checkbox in swift (iOS)?

Swift 5, Checkbox with animation

Create an outlet of the button

@IBOutlet weak var checkBoxOutlet:UIButton!{
        didSet{
            checkBoxOutlet.setImage(UIImage(named:"unchecked"), for: .normal)
            checkBoxOutlet.setImage(UIImage(named:"checked"), for: .selected)
        }
    }

Create an extension of UIButton

extension UIButton {
    //MARK:- Animate check mark
    func checkboxAnimation(closure: @escaping () -> Void){
        guard let image = self.imageView else {return}
        
        UIView.animate(withDuration: 0.1, delay: 0.1, options: .curveLinear, animations: {
            image.transform = CGAffineTransform(scaleX: 0.8, y: 0.8)
            
        }) { (success) in
            UIView.animate(withDuration: 0.1, delay: 0, options: .curveLinear, animations: {
                self.isSelected = !self.isSelected
                //to-do
                closure()
                image.transform = .identity
            }, completion: nil)
        }
        
    }
}

How to use

 @IBAction func checkbox(_ sender: UIButton){
        sender.checkboxAnimation {
            print("I'm done")
            //here you can also track the Checked, UnChecked state with sender.isSelected
            print(sender.isSelected)
            
        }
}

Check my Example for Checkbox and Radio button https://github.com/rashidlatif55/CheckBoxAndRadioButton

Download a file from NodeJS Server using Express

For static files like pdfs, Word docs, etc. just use Express's static function in your config:

// Express config
var app = express().configure(function () {
    this.use('/public', express.static('public')); // <-- This right here
});

And then just put all your files inside that 'public' folder, for example:

/public/docs/my_word_doc.docx

And then a regular old link will allow the user to download it:

<a href="public/docs/my_word_doc.docx">My Word Doc</a>

Angularjs - ng-cloak/ng-show elements blink

I had a similar issue and found out that if you have a class that contains transitions, the element will blink. I tried to add ng-cloak without success, but by removing the transition the button stopped blinking.

I'm using ionic framework and the button-outline has this transition

.button-outline {
  -webkit-transition: opacity .1s;
  transition: opacity .1s;
}

Simply overwrite the class to remove the transition and the button will stop blinking.

Update

Again on ionic there is a flicker when using ng-show/ng-hide. Adding the following CSS resolves it:

.ng-hide-add,
.ng-hide-remove {
  display: none !important;
}

Source: http://forum.ionicframework.com/t/beta-14-ng-hide-show/14270/9

How to bring an activity to foreground (top of stack)?

If you want to bring an activity to the top of the stack when clicking on a Notification then you may need to do the following to make the FLAG_ACTIVITY_REORDER_TO_FRONT work:

The solution for me for this was to make a broadcast receiver that listens to broadcast actions that the notification triggers. So basically:

  1. Notification triggers a broadcast action with an extra the name of the activity to launch.

  2. Broadcast receiver catches this when the notification is clicked, then creates an intent to launch that activity using the FLAG_ACTIVITY_REORDER_TO_FRONT flag

  3. Activity is brought to the top of activity stack, no duplicates.

How to ignore the certificate check when ssl

For anyone interested in applying this solution on a per request basis, this is an option and uses a Lambda expression. The same Lambda expression can be applied to the global filter mentioned by blak3r as well. This method appears to require .NET 4.5.

String url = "https://www.stackoverflow.com";
HttpWebRequest request = HttpWebRequest.CreateHttp(url);
request.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => true;

In .NET 4.0, the Lambda Expression can be applied to the global filter as such

ServicePointManager.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => true;

CodeIgniter Active Record not equal

Try this code. This seems working in my case.

$this->db->where(array('id !='=> $id))

How do I inject a controller into another controller in AngularJS

<div ng-controller="TestCtrl1">
    <div ng-controller="TestCtrl2">
      <!-- your code--> 
    </div> 
</div>

This works best in my case, where TestCtrl2 has it's own directives.

var testCtrl2 = $controller('TestCtrl2')

This gives me an error saying scopeProvider injection error.

   var testCtrl1ViewModel = $scope.$new();
   $controller('TestCtrl1',{$scope : testCtrl1ViewModel });
   testCtrl1ViewModel.myMethod(); 

This doesn't really work if you have directives in 'TestCtrl1', that directive actually have a different scope from this one created here. You end up with two instances of 'TestCtrl1'.

Change R default library path using .libPaths in Rprofile.site fails to work

I read the readme. In that they mentioned use .libPaths() in command line to check which paths are there. I had 2 library paths earlier. When I used the command .libpath("C:/Program Files/R/R-3.2.4revised/library") where I wanted, it changed the library path. When I typed in .libPaths() at the command line again it showed me the correct path. Hope this helps

How do I force a DIV block to extend to the bottom of a page even if it has no content?

You can use the "vh" length unit for the min-height property of the element itself and its parents. It's supported since IE9:

<body class="full-height">
    <form id="form1">
    <div id="header">
        <a title="Home" href="index.html" />
    </div>

    <div id="menuwrapper">
        <div id="menu">
        </div>
    </div>

    <div id="content" class="full-height">
    </div>
</body>

CSS:

.full-height {
    min-height: 100vh;
    box-sizing: border-box;
}

Make a phone call programmatically

'openURL:' is deprecated: first deprecated in iOS 10.0 - Please use openURL:options:completionHandler: instead

in Objective-c iOS 10+ use :

NSString *phoneNumber = [@"tel://" stringByAppendingString:mymobileNO.titleLabel.text];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:phoneNumber] options:@{} completionHandler:nil];

In-place edits with sed on OS X

You can use the -i flag correctly by providing it with a suffix to add to the backed-up file. Extending your example:

sed -i.bu 's/oldword/newword/' file1.txt

Will give you two files: one with the name file1.txt that contains the substitution, and one with the name file1.txt.bu that has the original content.

Mildly dangerous

If you want to destructively overwrite the original file, use something like:

sed -i '' 's/oldword/newword/' file1.txt
      ^ note the space

Because of the way the line gets parsed, a space is required between the option flag and its argument because the argument is zero-length.

Other than possibly trashing your original, I’m not aware of any further dangers of tricking sed this way. It should be noted, however, that if this invocation of sed is part of a script, The Unix Way™ would (IMHO) be to use sed non-destructively, test that it exited cleanly, and only then remove the extraneous file.

.crx file install in chrome

I had a similar issue where I was not able to either install a CRX file into Chrome.

It turns out that since I had my Downloads folder set to a network mapped drive, it would not allow Chrome to install any extensions and would either do nothing (drag and drop on Chrome) or ask me to download the extension (if I clicked a link from the Web Store).

Setting the Downloads folder to a local disk directory instead of a network directory allowed extensions to be installed.

Running: 20.0.1132.57 m

What does the Java assert keyword do, and when should it be used?

Here's the most common use case. Suppose you're switching on an enum value:

switch (fruit) {
  case apple:
    // do something
    break;
  case pear:
    // do something
    break;
  case banana:
    // do something
    break;
}

As long as you handle every case, you're fine. But someday, somebody will add fig to your enum and forget to add it to your switch statement. This produces a bug that may get tricky to catch, because the effects won't be felt until after you've left the switch statement. But if you write your switch like this, you can catch it immediately:

switch (fruit) {
  case apple:
    // do something
    break;
  case pear:
    // do something
    break;
  case banana:
    // do something
    break;
  default:
    assert false : "Missing enum value: " + fruit;
}

Is there a destructor for Java?

Perhaps you can use a try ... finally block to finalize the object in the control flow at which you are using the object. Of course it doesn't happen automatically, but neither does destruction in C++. You often see closing of resources in the finally block.

How to convert dataframe into time series?

See this question: Converting data.frame to xts order.by requires an appropriate time-based object, which suggests looking at argument to order.by,

Currently acceptable classes include: ‘Date’, ‘POSIXct’, ‘timeDate’, as well as ‘yearmon’ and ‘yearqtr’ where the index values remain unique.

And further suggests an explicit conversion using order.by = as.POSIXct,

df$Date <- as.POSIXct(strptime(df$Date,format),tz="UTC")
xts(df[, -1], order.by=as.POSIXct(df$Date))

Where your format is assigned elswhere,

format <- "%m/%d/%Y" #see strptime for details

Java: How to read a text file

You can use Files#readAllLines() to get all lines of a text file into a List<String>.

for (String line : Files.readAllLines(Paths.get("/path/to/file.txt"))) {
    // ...
}

Tutorial: Basic I/O > File I/O > Reading, Writing and Creating text files


You can use String#split() to split a String in parts based on a regular expression.

for (String part : line.split("\\s+")) {
    // ...
}

Tutorial: Numbers and Strings > Strings > Manipulating Characters in a String


You can use Integer#valueOf() to convert a String into an Integer.

Integer i = Integer.valueOf(part);

Tutorial: Numbers and Strings > Strings > Converting between Numbers and Strings


You can use List#add() to add an element to a List.

numbers.add(i);

Tutorial: Interfaces > The List Interface


So, in a nutshell (assuming that the file doesn't have empty lines nor trailing/leading whitespace).

List<Integer> numbers = new ArrayList<>();
for (String line : Files.readAllLines(Paths.get("/path/to/file.txt"))) {
    for (String part : line.split("\\s+")) {
        Integer i = Integer.valueOf(part);
        numbers.add(i);
    }
}

If you happen to be at Java 8 already, then you can even use Stream API for this, starting with Files#lines().

List<Integer> numbers = Files.lines(Paths.get("/path/to/test.txt"))
    .map(line -> line.split("\\s+")).flatMap(Arrays::stream)
    .map(Integer::valueOf)
    .collect(Collectors.toList());

Tutorial: Processing data with Java 8 streams

I want to convert std::string into a const wchar_t *

You can use the ATL text conversion macros to convert a narrow (char) string to a wide (wchar_t) one. For example, to convert a std::string:

#include <atlconv.h>
...
std::string str = "Hello, world!";
CA2W pszWide(str.c_str());
loadU(pszWide);

You can also specify a code page, so if your std::string contains UTF-8 chars you can use:

CA2W pszWide(str.c_str(), CP_UTF8);

Very useful but Windows only.

File to import not found or unreadable: compass

I was uninstalled compass 1.0.1 and install compass 0.12.7, this fix problem for me

$ sudo gem uninstall compass
$ sudo gem install compass -v 0.12.7

Trigger change() event when setting <select>'s value with val() function

I separate it, and then use an identity comparison to dictate what is does next.

$("#selectField").change(function(){
  if(this.value === 'textValue1'){ $(".contentClass1").fadeIn(); }
  if(this.value === 'textValue2'){ $(".contentclass2").fadeIn(); }
});

How to add leading zeros?

Expanding on @goodside's repsonse:

In some cases you may want to pad a string with zeros (e.g. fips codes or other numeric-like factors). In OSX/Linux:

> sprintf("%05s", "104")
[1] "00104"

But because sprintf() calls the OS's C sprintf() command, discussed here, in Windows 7 you get a different result:

> sprintf("%05s", "104")
[1] "  104"

So on Windows machines the work around is:

> sprintf("%05d", as.numeric("104"))
[1] "00104"

require is not defined? Node.js

As Abel said, ES Modules in Node >= 14 no longer have require by default.

If you want to add it, put this code at the top of your file:

import { createRequire } from 'module';
const require = createRequire(import.meta.url);

Source: https://nodejs.org/api/modules.html#modules_module_createrequire_filename

Default passwords of Oracle 11g?

Login into the machine as oracle login user id( where oracle is installed)..

  1. Add ORACLE_HOME = <Oracle installation Directory> in Environment variable

  2. Open a command prompt

  3. Change the directory to %ORACLE_HOME%\bin

  4. type the command sqlplus /nolog

  5. SQL> connect /as sysdba

  6. SQL> alter user SYS identified by "newpassword";

One more check, while oracle installation and database confiuration assistant setup, if you configure any database then you might have given password and checked the same password for all other accounts.. If so, then you try with the password which you have given in your database configuration assistant setup.

Hope this will work for you..

AppStore - App status is ready for sale, but not in app store

After 48 hours of the still not being updated I removed the app from sale on Pricing and Availability.

Then I waited 1 hour.

Then I ticked All Territories Selected again.

After the app came available for download again the version number was updated.

How can I pass some data from one controller to another peer controller

Definitely use a service to share data between controllers, here is a working example. $broadcast is not the way to go, you should avoid using the eventing system when there is a more appropriate way. Use a 'service', 'value' or 'constant' (for global constants).

http://plnkr.co/edit/ETWU7d0O8Kaz6qpFP5Hp

Here is an example with an input so you can see the data mirror on the page: http://plnkr.co/edit/DbBp60AgfbmGpgvwtnpU

var testModule = angular.module('testmodule', []);

testModule
   .controller('QuestionsStatusController1',
    ['$rootScope', '$scope', 'myservice',
    function ($rootScope, $scope, myservice) {
       $scope.myservice = myservice;   
    }]);

testModule
   .controller('QuestionsStatusController2',
    ['$rootScope', '$scope', 'myservice',
    function ($rootScope, $scope, myservice) {
      $scope.myservice = myservice;
    }]);

testModule
    .service('myservice', function() {
      this.xxx = "yyy";
    });

IsNumeric function in c#

It is worth mentioning that one can check the characters in the string against Unicode categories - numbers, uppercase, lowercase, currencies and more. Here are two examples checking for numbers in a string using Linq:

var containsNumbers = s.Any(Char.IsNumber);
var isNumber = s.All(Char.IsNumber);

For clarity, the syntax above is a shorter version of:

var containsNumbers = s.Any(c=>Char.IsNumber(c));
var isNumber = s.All(c=>Char.IsNumber(c));

Link to unicode categories on MSDN:

UnicodeCategory Enumeration

Update Tkinter Label from variable

The window is only displayed once the mainloop is entered. So you won't see any changes you make in your while True block preceding the line root.mainloop().


GUI interfaces work by reacting to events while in the mainloop. Here's an example where the StringVar is also connected to an Entry widget. When you change the text in the Entry widget it automatically changes in the Label.

from tkinter import *

root = Tk()
var = StringVar()
var.set('hello')

l = Label(root, textvariable = var)
l.pack()

t = Entry(root, textvariable = var)
t.pack()

root.mainloop() # the window is now displayed

I like the following reference: tkinter 8.5 reference: a GUI for Python


Here is a working example of what you were trying to do:

from tkinter import *
from time import sleep

root = Tk()
var = StringVar()
var.set('hello')

l = Label(root, textvariable = var)
l.pack()

for i in range(6):
    sleep(1) # Need this to slow the changes down
    var.set('goodbye' if i%2 else 'hello')
    root.update_idletasks()

root.update Enter event loop until all pending events have been processed by Tcl.

How do I define a method which takes a lambda as a parameter in Java 8?

Do the following ..

You have declared method(lambda l) All you want to do is create a Interface with the name lambda and declare one abstract method

public int add(int a,int b);  

method name does not matter here..

So when u call MyClass.method( (a,b)->a+b) This implementation (a,b)->a+b will be injected to your interface add method .So whenever you call l.add it is going to take this implementation and perform addition of a and b and return l.add(2,3) will return 5. - Basically this is what lambda does..

$(window).scrollTop() vs. $(document).scrollTop()

I've just had some of the similar problems with scrollTop described here.

In the end I got around this on Firefox and IE by using the selector $('*').scrollTop(0);

Not perfect if you have elements you don't want to effect but it gets around the Document, Body, HTML and Window disparity. If it helps...

SMTP error 554

To resolve problem go to the MDaemon-->setup-->Miscellaneous options-->Server-->SMTP Server Checks commands and headers for RFC Compliance

how to convert String into Date time format in JAVA?

Using this,

        String s = "03/24/2013 21:54";
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MM/dd/yyyy HH:mm");
        try
        {
            Date date = simpleDateFormat.parse(s);

            System.out.println("date : "+simpleDateFormat.format(date));
        }
        catch (ParseException ex)
        {
            System.out.println("Exception "+ex);
        }

Getting Error "Form submission canceled because the form is not connected"

I faced the same issue in one of our implementation.

we were using jquery.forms.js. which is a forms plugin and available here. http://malsup.com/jquery/form/

we used the same answer provided above and pasted

$(document.body).append(form);

and it worked.Thanks.

How to get the next auto-increment id in mysql

I suggest to rethink what you are doing. I never experienced one single use case where that special knowledge is required. The next id is a very special implementation detail and I wouldn't count on getting it is ACID safe.

Make one simple transaction which updates your inserted row with the last id:

BEGIN;

INSERT INTO payments (date, item, method)
     VALUES (NOW(), '1 Month', 'paypal');

UPDATE payments SET payment_code = CONCAT("sahf4d2fdd45", LAST_INSERT_ID())
     WHERE id = LAST_INSERT_ID();

COMMIT;

Convert float to string with precision & number of decimal digits specified?

You can use C++20 std::format or the fmt::format function from the {fmt} library, std::format is based on:

#include <fmt/core.h>

int main()
  std::string s = fmt::format("{:.2f}", 3.14159265359); // s == "3.14"
}

where 2 is a precision.

Java, Calculate the number of days between two dates

This function is good for me:

public static int getDaysCount(Date begin, Date end) {
    Calendar start = org.apache.commons.lang.time.DateUtils.toCalendar(begin);
    start.set(Calendar.MILLISECOND, 0);
    start.set(Calendar.SECOND, 0);
    start.set(Calendar.MINUTE, 0);
    start.set(Calendar.HOUR_OF_DAY, 0);

    Calendar finish = org.apache.commons.lang.time.DateUtils.toCalendar(end);
    finish.set(Calendar.MILLISECOND, 999);
    finish.set(Calendar.SECOND, 59);
    finish.set(Calendar.MINUTE, 59);
    finish.set(Calendar.HOUR_OF_DAY, 23);

    long delta = finish.getTimeInMillis() - start.getTimeInMillis();
    return (int) Math.ceil(delta / (1000.0 * 60 * 60 * 24));
}

how to make log4j to write to the console as well

Write the root logger as below for logging on both console and FILE

log4j.rootLogger=ERROR,console,FILE

And write the respective definitions like Target, Layout, and ConversionPattern (MaxFileSize for file etc).

Java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException

I also have the same error. I have updated the jackson library version and error has gone.

<!-- Jackson to convert Java object to Json -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.4</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.4</version>
        </dependency>
    </dependencies>

and also check your data classes that have you created getters and setters for all the properties.

The import org.junit cannot be resolved

When you add TestNG to your Maven dependencies , Change scope from test to compile.Hope this would solve your issue..

HTML inside Twitter Bootstrap popover

You can use the popover event, and control the width by attribute 'data-width'

_x000D_
_x000D_
$('[data-toggle="popover-huongdan"]').popover({ html: true });_x000D_
$('[data-toggle="popover-huongdan"]').on("shown.bs.popover", function () {_x000D_
    var width = $(this).attr("data-width") == undefined ? 276 : parseInt($(this).attr("data-width"));_x000D_
    $("div[id^=popover]").css("max-width", width);_x000D_
});
_x000D_
 <a class="position-absolute" href="javascript:void(0);" data-toggle="popover-huongdan" data-trigger="hover" data-width="500" title="title-popover" data-content="html-content-code">_x000D_
 <i class="far fa-question-circle"></i>_x000D_
 </a>
_x000D_
_x000D_
_x000D_

Simple conversion between java.util.Date and XMLGregorianCalendar

From java.util.Date to XMLGregorianCalendar you can simply do:

import javax.xml.datatype.XMLGregorianCalendar;
import javax.xml.datatype.DatatypeFactory;
import java.util.GregorianCalendar;
......
GregorianCalendar gcalendar = new GregorianCalendar();
gcalendar.setTime(yourDate);
XMLGregorianCalendar xmlDate = DatatypeFactory.newInstance().newXMLGregorianCalendar(gcalendar);

Code edited after the first comment of @f-puras, by cause i do a mistake.

Java Package Does Not Exist Error

Are they in the right subdirectories?

If you put /usr/share/stuff on the class path, files defined with package org.name should be in /usr/share/stuff/org/name.

EDIT: If you don't already know this, you should probably read this: http://download.oracle.com/javase/1.5.0/docs/tooldocs/windows/classpath.html#Understanding

EDIT 2: Sorry, I hadn't realised you were talking of Java source files in /usr/share/stuff. Not only they need to be in the appropriate sub-directory, but you need to compile them. The .java files don't need to be on the classpath, but on the source path. (The generated .class files need to be on the classpath.)

You might get away with compiling them if they're not under the right directory structure, but they should be, or it will generate warnings at least. The generated class files will be in the right subdirectories (wherever you've specified -d if you have).

You should use something like javac -sourcepath .:/usr/share/stuff test.java, assuming you've put the .java files that were under /usr/share/stuff under /usr/share/stuff/org/name (or whatever is appropriate according to their package names).

Is there a C# case insensitive equals operator?

I am so used to typing at the end of these comparison methods: , StringComparison.

So I made an extension.

namespace System
{   public static class StringExtension
    {
        public static bool Equals(this string thisString, string compareString,
             StringComparison stringComparison)
        {
            return string.Equals(thisString, compareString, stringComparison);
        }
    }
}

Just note that you will need to check for null on thisString prior to calling the ext.

No space left on device

Maybe you are out of inodes. Try df -i

                     2591792  136322 2455470    6% /home
/dev/sdb1            1887488 1887488       0  100% /data

Disk used 6% but inode table full.

How to work with progress indicator in flutter?

For me, one neat way to do this is to show a SnackBar at the bottom while the Signing-In process is taken place, this is a an example of what I mean:

enter image description here

Here is how to setup the SnackBar.

Define a global key for your Scaffold

final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();

Add it to your Scaffold key attribute

return new Scaffold(
      key: _scaffoldKey,
.......

My SignIn button onPressed callback:

onPressed: () {
                  _scaffoldKey.currentState.showSnackBar(
                      new SnackBar(duration: new Duration(seconds: 4), content:
                      new Row(
                        children: <Widget>[
                          new CircularProgressIndicator(),
                          new Text("  Signing-In...")
                        ],
                      ),
                      ));
                  _handleSignIn()
                      .whenComplete(() =>
                      Navigator.of(context).pushNamed("/Home")
                  );
                }

It really depends on how you want to build your layout, and I am not sure what you have in mind.

Edit

You probably want it this way, I have used a Stack to achieve this result and just show or hide my indicator based on onPressed

enter image description here

class TestSignInView extends StatefulWidget {
  @override
  _TestSignInViewState createState() => new _TestSignInViewState();
}


class _TestSignInViewState extends State<TestSignInView> {
  bool _load = false;
  @override
  Widget build(BuildContext context) {
    Widget loadingIndicator =_load? new Container(
      color: Colors.grey[300],
      width: 70.0,
      height: 70.0,
      child: new Padding(padding: const EdgeInsets.all(5.0),child: new Center(child: new CircularProgressIndicator())),
    ):new Container();
    return new Scaffold(
      backgroundColor: Colors.white,
      body:  new Stack(children: <Widget>[new Padding(
        padding: const EdgeInsets.symmetric(vertical: 50.0, horizontal: 20.0),
        child: new ListView(

          children: <Widget>[
            new Column(
              mainAxisAlignment: MainAxisAlignment.center,
              crossAxisAlignment: CrossAxisAlignment.center
              ,children: <Widget>[
            new TextField(),
            new TextField(),

            new FlatButton(color:Colors.blue,child: new Text('Sign In'),
                onPressed: () {
              setState((){
                _load=true;
              });

                  //Navigator.of(context).push(new MaterialPageRoute(builder: (_)=>new HomeTest()));
                }
            ),

            ],),],
        ),),
        new Align(child: loadingIndicator,alignment: FractionalOffset.center,),

      ],));
  }

}

Align text in JLabel to the right

To me, it seems as if your actual intention is to put different words on different lines. But let me answer your first question:

JLabel lab=new JLabel("text");
lab.setHorizontalAlignment(SwingConstants.LEFT);     

And if you have an image:

JLabel lab=new Jlabel("text");
lab.setIcon(new ImageIcon("path//img.png"));
lab.setHorizontalTextPosition(SwingConstants.LEFT);

But, I believe you want to make the label such that there are only 2 words on 1 line.

In that case try this:

String urText="<html>You can<br>use basic HTML<br>in Swing<br> components," 
   +"Hope<br> I helped!";
JLabel lac=new JLabel(urText);
lac.setAlignmentX(Component.RIGHT_ALIGNMENT);

Giving graphs a subtitle in matplotlib

The solution that worked for me is:

  • use suptitle() for the actual title
  • use title() for the subtitle and adjust it using the optional parameter y:
    import matplotlib.pyplot as plt
    """
            some code here
    """
    plt.title('My subtitle',fontsize=16)
    plt.suptitle('My title',fontsize=24, y=1)
    plt.show()

There can be some nasty overlap between the two pieces of text. You can fix this by fiddling with the value of y until you get it right.

DB query builder toArray() laravel 4

And another solution

$objectData = DB::table('user')
    ->select('column1', 'column2')
    ->where('name', '=', 'Jhon')
    ->get();
$arrayData = array_map(function($item) {
    return (array)$item; 
}, $objectData->toArray());

It good in case when you need only several columns from entity.

Entity Framework - "An error occurred while updating the entries. See the inner exception for details"

Turn the Pluralization On. The problem is that you model object are using singular name (Pupil) convention, while in your database you are using pluralized names Pupils with s.

UPDATE

This post shows how can you turn it on or off. Some relevant excerpt of that post:

To turn pluralization on and off

  • On the Tools menu, click Options.

  • In the Options dialog box, expand Database Tools. Note: Select Show all settings if the Database Tools node is not visible.

  • Click O/R Designer.

  • Set Pluralization of names to Enabled = False to set the O/R Designer so that it does not change class names.

  • Set Pluralization of names to Enabled = True to apply pluralization rules to the class names of objects added to the O/R Designer.

UPDATE 2

But note that, you should avoid pluralized names. You can read here how to do it (I'll cite it here, just in case the link gets broken).

(...) When you work with Entity Framework Code First approach, you are creating your database tables from your model classes. Usually Entity Framework will create tables with Pluralized names. that means if you have a model class called PhoneNumber, Entity framework will create a table for this class called “PhoneNumbers“. If you wish to avoid pluralized name and wants singular name like Customer , you can do it like this In your DBContext class, Override the “OnModelCreating” method like this (...)

enter image description here

(...) Having this Method Overriding will avoid creating tables with pluralized names. Now it will create a Table called “PhoneNumber” , Not “PhoneNumbers” (...)

Reading numbers from a text file into an array in C

There are two problems in your code:

  • the return value of scanf must be checked
  • the %d conversion does not take overflows into account (blindly applying *10 + newdigit for each consecutive numeric character)

The first value you got (-104204697) is equals to 5623125698541159 modulo 2^32; it is thus the result of an overflow (if int where 64 bits wide, no overflow would happen). The next values are uninitialized (garbage from the stack) and thus unpredictable.

The code you need could be (similar to the answer of BLUEPIXY above, with the illustration how to check the return value of scanf, the number of items successfully matched):

#include <stdio.h>

int main(int argc, char *argv[]) {
    int i, j;
    short unsigned digitArray[16];
    i = 0;
    while (
        i != sizeof(digitArray) / sizeof(digitArray[0])
     && 1 == scanf("%1hu", digitArray + i)
    ) {
        i++;
    }
    for (j = 0; j != i; j++) {
        printf("%hu\n", digitArray[j]);
    }
    return 0;
}

Difference between IISRESET and IIS Stop-Start command

I know this is quite an old post, but I would like to point out the following for people who will read it in the future: As per MS:

Do not use the IISReset.exe tool to restart the IIS services. Instead, use the NET STOP and NET START commands. For example, to stop and start the World Wide Web Publishing Service, run the following commands:

  • NET STOP iisadmin /y
  • NET START w3svc

There are two benefits to using the NET STOP/NET START commands to restart the IIS Services as opposed to using the IISReset.exe tool. First, it is possible for IIS configuration changes that are in the process of being saved when the IISReset.exe command is run to be lost. Second, using IISReset.exe can make it difficult to identify which dependent service or services failed to stop when this problem occurs. Using the NET STOP commands to stop each individual dependent service will allow you to identify which service fails to stop, so you can then troubleshoot its failure accordingly.

KB:https://support.microsoft.com/en-ca/help/969864/using-iisreset-exe-to-restart-internet-information-services-iis-result

How to convert array into comma separated string in javascript

You can simply use JavaScripts join() function for that. This would simply look like a.value.join(','). The output would be a string though.

What is the `data-target` attribute in Bootstrap 3?

The toggle tells Bootstrap what to do and the target tells Bootstrap which element is going to open. So whenever a link like that is clicked, a modal with an id of “basicModal” will appear.

How to connect access database in c#

You are building a DataGridView on the fly and set the DataSource for it. That's good, but then do you add the DataGridView to the Controls collection of the hosting form?

this.Controls.Add(dataGridView1);

By the way the code is a bit confused

String connection = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\\Tables.accdb;Persist Security Info=True";
string sql  = "SELECT Clients  FROM Tables";
using(OleDbConnection conn = new OleDbConnection(connection))
{
     conn.Open();
     DataSet ds = new DataSet();
     DataGridView dataGridView1 = new DataGridView();
     using(OleDbDataAdapter adapter = new OleDbDataAdapter(sql,conn))
     {
         adapter.Fill(ds);
         dataGridView1.DataSource = ds;
         // Of course, before addint the datagrid to the hosting form you need to 
         // set position, location and other useful properties. 
         // Why don't you create the DataGrid with the designer and use that instance instead?
         this.Controls.Add(dataGridView1);
     }
}

EDIT After the comments below it is clear that there is a bit of confusion between the file name (TABLES.ACCDB) and the name of the table CLIENTS.
The SELECT statement is defined (in its basic form) as

 SELECT field_names_list FROM _tablename_

so the correct syntax to use for retrieving all the clients data is

 string sql  = "SELECT * FROM Clients";

where the * means -> all the fields present in the table

the easiest way to convert matrix to one row vector

You can use the function RESHAPE:

B = reshape(A.',1,[]);

Is there a method that tells my program to quit?

Please note that the solutions based on sys.exit() or any Exception may not work in a multi-threaded environment.

Since exit() ultimately “only” raises an exception, it will only exit the process when called from the main thread, and the exception is not intercepted. (doc)

This answer from Alex Martelli for more details.

How do I install Python OpenCV through Conda?

I have just tried on two Win32 Python 3.5 computers. At first, I was able to conda install opencv, but it didn't work nor did the version from menpp, but this did:

conda install -c https://conda.binstar.org/conda-forge opencv

How to Run a jQuery or JavaScript Before Page Start to Load

If you don't want anything to display before the redirect, then you will need to use some server side scripting to accomplish the task before the page is served. The page has already begun loading by the time your Javascript is executed on the client side.

If Javascript is your only option, your best best is to make your script the first .js file included in the <head> of your document.

Instead of Javascript, I recommend setting up your redirect logic in your Apache or nginx server configuration.

Styling input buttons for iPad and iPhone

You may be looking for

-webkit-appearance: none;

how to overcome ERROR 1045 (28000): Access denied for user 'ODBC'@'localhost' (using password: NO) permanently

You can create user with no password in phpmyadmin and it solves the problem! Lebbar Abdelhadi,

Adding and using header (HTTP) in nginx

To add a header just add the following code to the location block where you want to add the header:

location some-location {
  add_header X-my-header my-header-content;      
}

Obviously, replace the x-my-header and my-header-content with what you want to add. And that's all there is to it.

Confused about __str__ on list in Python

print self.id.__str__() would work for you, although not that useful for you.

Your __str__ method will be more useful when you say want to print out a grid or struct representation as your program develops.

print self._grid.__str__()

def __str__(self):
    """
    Return a string representation of the grid for debugging.
    """
    grid_str = ""
    for row in range(self._rows):
        grid_str += str( self._grid[row] )
        grid_str += '\n'
    return grid_str

PHP header redirect 301 - what are the implications?

Make sure you die() after your redirection, and make sure you do your redirect AS SOON AS POSSIBLE while your script executes. It makes sure that no more database queries (if some) are not wasted for nothing. That's the one tip I can give you

For search engines, 301 is the best response code

What should I set JAVA_HOME environment variable on macOS X 10.6?

I'm on Mac OS 10.6.8

The easiest solution works for me is simply put in

$ export JAVA_HOME=$(/usr/libexec/java_home)

To test whether it works, put in

$ echo $JAVA_HOME

it shows

/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

you can also test

$ which java

How do I use SELECT GROUP BY in DataTable.Select(Expression)?

DataTable's Select method only supports simple filtering expressions like {field} = {value}. It does not support complex expressions, let alone SQL/Linq statements.

You can, however, use Linq extension methods to extract a collection of DataRows then create a new DataTable.

dt = dt.AsEnumerable()
       .GroupBy(r => new {Col1 = r["Col1"], Col2 = r["Col2"]})
       .Select(g => g.OrderBy(r => r["PK"]).First())
       .CopyToDataTable();

Copy the entire contents of a directory in C#

The code below is microsoft suggestion how-to-copy-directories and it is shared by dear @iato but it just copies sub directories and files of source folder recursively and doesn't copy the source folder it self (like right click -> copy ).

but there is a tricky way below this answer :

private static void DirectoryCopy(string sourceDirName, string destDirName, bool copySubDirs = true)
        {
            // Get the subdirectories for the specified directory.
            DirectoryInfo dir = new DirectoryInfo(sourceDirName);

            if (!dir.Exists)
            {
                throw new DirectoryNotFoundException(
                    "Source directory does not exist or could not be found: "
                    + sourceDirName);
            }

            DirectoryInfo[] dirs = dir.GetDirectories();
            // If the destination directory doesn't exist, create it.
            if (!Directory.Exists(destDirName))
            {
                Directory.CreateDirectory(destDirName);
            }

            // Get the files in the directory and copy them to the new location.
            FileInfo[] files = dir.GetFiles();
            foreach (FileInfo file in files)
            {
                string temppath = Path.Combine(destDirName, file.Name);
                file.CopyTo(temppath, false);
            }

            // If copying subdirectories, copy them and their contents to new location.
            if (copySubDirs)
            {
                foreach (DirectoryInfo subdir in dirs)
                {
                    string temppath = Path.Combine(destDirName, subdir.Name);
                    DirectoryCopy(subdir.FullName, temppath, copySubDirs);
                }
            }
        }

if you want to copy contents of source folder and subfolders recursively you can simply use it like this :

string source = @"J:\source\";
string dest= @"J:\destination\";
DirectoryCopy(source, dest);

but if you want to copy the source directory it self (similar that you have right clicked on source folder and clicked copy then in the destination folder you clicked paste) you should use like this :

 string source = @"J:\source\";
 string dest= @"J:\destination\";
 DirectoryCopy(source, Path.Combine(dest, new DirectoryInfo(source).Name));

How to access cookies in AngularJS?

Angular deprecated $cookieStore in version 1.4.x, so use $cookies instead if you are using latest version of angular. Syntax remain same for $cookieStore & $cookies:

$cookies.put("key", "value"); 
var value = $cookies.get("key");

See the Docs for an API overview. Mind also that the cookie service has been enhanced with some new important features like setting expiration (see this answer) and domain (see CookiesProvider Docs).

Note that, in version 1.3.x or below, $cookies has a different syntax than above:

$cookies.key = "value";
var value = $cookies.value; 

Also if you are using bower, make sure to type your package name correctly:

bower install [email protected] 

where X.Y.Z is the AngularJS version you are running. There's another package in bower "angular-cookie"(without the 's') which is not the official angular package.

Why does CSV file contain a blank line in between each data line when outputting with Dictwriter in Python

From http://docs.python.org/library/csv.html#csv.writer:

If csvfile is a file object, it must be opened with the ‘b’ flag on platforms where that makes a difference.

In other words, when opening the file you pass 'wb' as opposed to 'w'.
You can also use a with statement to close the file when you're done writing to it.
Tested example below:

from __future__ import with_statement # not necessary in newer versions
import csv
headers=['id', 'year', 'activity', 'lineitem', 'datum']
with open('file3.csv','wb') as fou: # note: 'wb' instead of 'w'
    output = csv.DictWriter(fou,delimiter=',',fieldnames=headers)
    output.writerow(dict((fn,fn) for fn in headers))
    output.writerows(rows)

adding multiple entries to a HashMap at once in one statement

You can use Google Guava's ImmutableMap. This works as long as you don't care about modifying the Map later (you can't call .put() on the map after constructing it using this method):

import com.google.common.collect.ImmutableMap;

// For up to five entries, use .of()
Map<String, Integer> littleMap = ImmutableMap.of(
    "One", Integer.valueOf(1),
    "Two", Integer.valueOf(2),
    "Three", Integer.valueOf(3)
);

// For more than five entries, use .builder()
Map<String, Integer> bigMap = ImmutableMap.<String, Integer>builder()
    .put("One", Integer.valueOf(1))
    .put("Two", Integer.valueOf(2))
    .put("Three", Integer.valueOf(3))
    .put("Four", Integer.valueOf(4))
    .put("Five", Integer.valueOf(5))
    .put("Six", Integer.valueOf(6))
    .build();

See also: http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/collect/ImmutableMap.html

A somewhat related question: ImmutableMap.of() workaround for HashMap in Maps?

Getting only hour/minute of datetime

Just use Hour and Minute properties

var date = DateTime.Now;
date.Hour;
date.Minute;

Or you can easily zero the seconds using

var zeroSecondDate = date.AddSeconds(-date.Second);

Cheap way to search a large text file for a string

I'm surprised no one mentioned mapping the file into memory: mmap

With this you can access the file as if it were already loaded into memory and the OS will take care of mapping it in and out as possible. Also, if you do this from 2 independent processes and they map the file "shared", they will share the underlying memory.

Once mapped, it will behave like a bytearray. You can use regular expressions, find or any of the other common methods.

Beware that this approach is a little OS specific. It will not be automatically portable.

How to force a list to be vertical using html css

Hope this is your structure:

   <ul> 
     <li>
        <div ><img.. /><p>text</p></div>
    </li>
     <li>
        <div ><img.. /><p>text</p></div>
    </li>
     <li>
        <div ><img.. /><p>text</p></div>
    </li>
   </ul> 

By default, it will be add one after another row:

-----
-----
-----

if you want to make it vertical, just add float left to li, give width and height, make sure that content will not break the width:

|  |  |
|  |  |

li
{
   display:block;
   float:left;
   width:300px; /* adjust */
   height:150px; /* adjust */
   padding: 5px; /*adjust*/
}

How to convert an object to JSON correctly in Angular 2 with TypeScript

In your product.service.ts you are using stringify method in a wrong way..

Just use

JSON.stringify(product) 

instead of

JSON.stringify({product})

i have checked your problem and after this it's working absolutely fine.

How do I clear this setInterval inside a function?

The setInterval method returns a handle that you can use to clear the interval. If you want the function to return it, you just return the result of the method call:

function intervalTrigger() {
  return window.setInterval( function() {
    if (timedCount >= markers.length) {
       timedCount = 0;
    }
    google.maps.event.trigger(markers[timedCount], "click");
    timedCount++;
  }, 5000 );
};
var id = intervalTrigger();

Then to clear the interval:

window.clearInterval(id);

JQuery Number Formatting

Putting this http://www.mredkj.com/javascript/numberFormat.html and $('.number').formatNumber(); concept together, you may use the following line of code;

e.g. <td class="number">1172907.50</td> will be formatted like <td class="number">1,172,907.50</td>

$('.number').text(function () { 
    var str = $(this).html() + ''; 
    x = str.split('.'); 
    x1 = x[0]; x2 = x.length > 1 ? '.' + x[1] : ''; 
    var rgx = /(\d+)(\d{3})/; 
    while (rgx.test(x1)) { 
        x1 = x1.replace(rgx, '$1' + ',' + '$2'); 
    } 
    $(this).html(x1 + x2); 
});

-XX:MaxPermSize with or without -XX:PermSize

-XX:PermSize specifies the initial size that will be allocated during startup of the JVM. If necessary, the JVM will allocate up to -XX:MaxPermSize.

How to use the read command in Bash?

To put my two cents here: on KSH, reading as is to a variable will work, because according to the IBM AIX documentation, KSH's read does affects the current shell environment:

The setting of shell variables by the read command affects the current shell execution environment.

This just resulted in me spending a good few minutes figuring out why a one-liner ending with read that I've used a zillion times before on AIX didn't work on Linux... it's because KSH does saves to the current environment and BASH doesn't!

How do I simulate a hover with a touch in touch enabled browsers?

Solved 2019 - Hover on Touch

It now seems best to avoid using hover altogether with ios or touch in general. The below code applies your css as long as touch is maintained, and without other ios flyouts. Do this;

  1. Jquery add: $("p").on("touchstart", function(e) { $(this).focus(); e.preventDefault(); });

  2. CSS: replace p:hover with p:focus, and add p:active

Options;

  • replace jquery p selector with any class etc

  • to have the effect remain, keep p:hover as well, and add body{cursor:ponter;} so a tap anywhere ends it

  • try click & mouseover events as well as touchstart in same code (but not tested)

  • remove e.preventDefault(); to enable users to utilise ios flyouts eg copy

Notes

  • only tested for text elements, ios may treat inputs etc differently

  • only tested on iphone XR ios 12.1.12, and ipad 3 ios 9.3.5, using Safari or Chrome.

Using the RUN instruction in a Dockerfile with 'source' does not work

Building on the answers on this page I would add that you have to be aware that each RUN statement runs independently of the others with /bin/sh -c and therefore won't get any environment vars that would normally be sourced in login shells.

The best way I have found so far is to add the script to /etc/bash.bashrc and then invoke each command as bash login.

RUN echo "source /usr/local/bin/virtualenvwrapper.sh" >> /etc/bash.bashrc
RUN /bin/bash --login -c "your command"

You could for instance install and setup virtualenvwrapper, create the virtual env, have it activate when you use a bash login, and then install your python modules into this env:

RUN pip install virtualenv virtualenvwrapper
RUN mkdir -p /opt/virtualenvs
ENV WORKON_HOME /opt/virtualenvs
RUN echo "source /usr/local/bin/virtualenvwrapper.sh" >> /etc/bash.bashrc
RUN /bin/bash --login -c "mkvirtualenv myapp"
RUN echo "workon mpyapp" >> /etc/bash.bashrc
RUN /bin/bash --login -c "pip install ..."

Reading the manual on bash startup files helps understand what is sourced when.

Does a finally block always get executed in Java?

A logical way to think about this is:

  1. Code placed in a finally block must be executed whatever occurs within the try block
  2. So if code in the try block tries to return a value or throw an exception the item is placed 'on the shelf' till the finally block can execute
  3. Because code in the finally block has (by definition) a high priority it can return or throw whatever it likes. In which case anything left 'on the shelf' is discarded.
  4. The only exception to this is if the VM shuts down completely during the try block e.g. by 'System.exit'

How to get numeric value from a prompt box?

You have to use parseInt() to convert

For eg.

  var z = parseInt(x) + parseInt(y);

use parseFloat() if you want to handle float value.

How to clone git repository with specific revision/changeset?

git clone https://github.com/ORGANIZATION/repository.git (clone the repository)

cd repository (navigate to the repository)

git fetch origin 2600f4f928773d79164964137d514b85400b09b2

git checkout FETCH_HEAD

#1071 - Specified key was too long; max key length is 1000 bytes

I had this issue, and solved by following:

Cause

There is a known bug with MySQL related to MyISAM, the UTF8 character set and indexes that you can check here.

Resolution

  • Make sure MySQL is configured with the InnoDB storage engine.

  • Change the storage engine used by default so that new tables will always be created appropriately:

    set GLOBAL storage_engine='InnoDb';

  • For MySQL 5.6 and later, use the following:

    SET GLOBAL default_storage_engine = 'InnoDB';

  • And finally make sure that you're following the instructions provided in Migrating to MySQL.

Reference

Correct way to synchronize ArrayList in java

Let's take a normal list (implemented by the ArrayList class) and make it synchronized. This is shown in the SynchronizedListExample class. We pass the Collections.synchronizedList method a new ArrayList of Strings. The method returns a synchronized List of Strings. //Here is SynchronizedArrayList class

package com.mnas.technology.automation.utility;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.apache.log4j.Logger;
/**
* 
* @author manoj.kumar
* @email [email protected]
* 
*/
public class SynchronizedArrayList {
    static Logger log = Logger.getLogger(SynchronizedArrayList.class.getName());
    public static void main(String[] args) {    
        List<String> synchronizedList = Collections.synchronizedList(new ArrayList<String>());
        synchronizedList.add("Aditya");
        synchronizedList.add("Siddharth");
        synchronizedList.add("Manoj");
        // when iterating over a synchronized list, we need to synchronize access to the synchronized list
        synchronized (synchronizedList) {
            Iterator<String> iterator = synchronizedList.iterator();
            while (iterator.hasNext()) {
                log.info("Synchronized Array List Items: " + iterator.next());
            }
        }    
    }
}

Notice that when iterating over the list, this access is still done using a synchronized block that locks on the synchronizedList object. In general, iterating over a synchronized collection should be done in a synchronized block

How can I resolve the error: "The command [...] exited with code 1"?

For me : I have a white space in my path's folder name G:\Other Imp Projects\Mi.....

Solution 1 :

Remove white space from folder

Example: Other Imp Projects ->> Other_Imp_Projects

Solution 2:

add Quote ("") for your path.

Example: mkdir "$(ProjectDir)$(OutDir)Configurations" //see double quotes

Giving multiple conditions in for loop in Java

If you prefer a code with a pretty look, you can do a break:

for(int j = 0; ; j++){
    if(j < 6
    && j < ( (int) abc[j] & 0xff)){
        break;
    }

    // Put your code here
}

Mean of a column in a data frame, given the column's name

Suppose you have a data frame(say df) with columns "x" and "y", you can find mean of column (x or y) using:

1.Using mean() function

z<-mean(df$x)

2.Using the column name(say x) as a variable using attach() function

 attach(df)
 mean(x)

When done you can call detach() to remove "x"

detach()

3.Using with() function, it lets you use columns of data frame as distinct variables.

 z<-with(df,mean(x))

Is a slash ("/") equivalent to an encoded slash ("%2F") in the path portion of an HTTP URL

I also have a site that has numerous urls with urlencoded characters. I am finding that many web APIs (including Google webmaster tools and several Drupal modules) trip over urlencoded characters. Many APIs automatically decode urls at some point in their process and then use the result as a URL or HTML. When I find one of these problems, I usually double encode the results (which turns %2f into %252f) for that API. However, this will break other APIs which are not expecting double encoding, so this is not a universal solution.

Personally I am getting rid of as many special characters in my URLs as possible.

Also, I am using id numbers in my URLs which do not depend on urldecoding:

example.com/blog/my-amazing-blog%2fstory/yesterday

becomes:

example.com/blog/12354/my-amazing-blog%2fstory/yesterday

in this case, my code only uses 12354 to look for the article, and the rest of the URL gets ignored by my system (but is still used for SEO.) Also, this number should appear BEFORE the unused URL components. that way, the url will still work, even if the %2f gets decoded incorrectly.

Also, be sure to use canonical tags to ensure that url mistakes don't translate into duplicate content.

Change/Get check state of CheckBox

You need this:

window.onload = function(){
    var elCheckBox=document.getElementById("cbxTodos");
    elCheckBox.onchange =function (){
        alert("como ves");
    }
};

How do C++ class members get initialized if I don't do it explicitly?

You can also initialize data members at the point you declare them:

class another_example{
public:
    another_example();
    ~another_example();
private:
    int m_iInteger=10;
    double m_dDouble=10.765;
};

I use this form pretty much exclusively, although I have read some people consider it 'bad form', perhaps because it was only recently introduced - I think in C++11. To me it is more logical.

Another useful facet to the new rules is how to initialize data-members that are themselves classes. For instance suppose that CDynamicString is a class that encapsulates string handling. It has a constructor that allows you specify its initial value CDynamicString(wchat_t* pstrInitialString). You might very well use this class as a data member inside another class - say a class that encapsulates a windows registry value which in this case stores a postal address. To 'hard code' the registry key name to which this writes you use braces:

class Registry_Entry{
public:
    Registry_Entry();
    ~Registry_Entry();
    Commit();//Writes data to registry.
    Retrieve();//Reads data from registry;
private:
    CDynamicString m_cKeyName{L"Postal Address"};
    CDynamicString m_cAddress;
};

Note the second string class which holds the actual postal address does not have an initializer so its default constructor will be called on creation - perhaps automatically setting it to a blank string.

converting a base 64 string to an image and saving it

Here is working code for converting an image from a base64 string to an Image object and storing it in a folder with unique file name:

public void SaveImage()
{
    string strm = "R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7"; 

    //this is a simple white background image
    var myfilename= string.Format(@"{0}", Guid.NewGuid());

    //Generate unique filename
    string filepath= "~/UserImages/" + myfilename+ ".jpeg";
    var bytess = Convert.FromBase64String(strm);
    using (var imageFile = new FileStream(filepath, FileMode.Create))
    {
        imageFile.Write(bytess, 0, bytess.Length);
        imageFile.Flush();
    }
}

Add space between cells (td) using css

Consider using cellspacing and cellpadding attributes for table tag or border-spacing css property.

How to compare LocalDate instances Java 8

LocalDate ld ....;
LocalDateTime ldtime ...;

ld.isEqual(LocalDate.from(ldtime));

How can we store into an NSDictionary? What is the difference between NSDictionary and NSMutableDictionary?

The NSDictionary and NSMutableDictionary docs are probably your best bet. They even have some great examples on how to do various things, like...

...create an NSDictionary

NSArray *keys = [NSArray arrayWithObjects:@"key1", @"key2", nil];
NSArray *objects = [NSArray arrayWithObjects:@"value1", @"value2", nil];
NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:objects 
                                                       forKeys:keys];

...iterate over it

for (id key in dictionary) {
    NSLog(@"key: %@, value: %@", key, [dictionary objectForKey:key]);
}

...make it mutable

NSMutableDictionary *mutableDict = [dictionary mutableCopy];

Note: historic version before 2010: [[dictionary mutableCopy] autorelease]

...and alter it

[mutableDict setObject:@"value3" forKey:@"key3"];

...then store it to a file

[mutableDict writeToFile:@"path/to/file" atomically:YES];

...and read it back again

NSMutableDictionary *anotherDict = [NSMutableDictionary dictionaryWithContentsOfFile:@"path/to/file"];

...read a value

NSString *x = [anotherDict objectForKey:@"key1"];

...check if a key exists

if ( [anotherDict objectForKey:@"key999"] == nil ) NSLog(@"that key is not there");

...use scary futuristic syntax

From 2014 you can actually just type dict[@"key"] rather than [dict objectForKey:@"key"]

How to implement a FSM - Finite State Machine in Java

The heart of a state machine is the transition table, which takes a state and a symbol (what you're calling an event) to a new state. That's just a two-index array of states. For sanity and type safety, declare the states and symbols as enumerations. I always add a "length" member in some way (language-specific) for checking array bounds. When I've hand-coded FSM's, I format the code in row and column format with whitespace fiddling. The other elements of a state machine are the initial state and the set of accepting states. The most direct implementation of the set of accepting states is an array of booleans indexed by the states. In Java, however, enumerations are classes, and you can specify an argument "accepting" in the declaration for each enumerated value and initialize it in the constructor for the enumeration.

For the machine type, you can write it as a generic class. It would take two type arguments, one for the states and one for the symbols, an array argument for the transition table, a single state for the initial. The only other detail (though it's critical) is that you have to call Enum.ordinal() to get an integer suitable for indexing the transition array, since you there's no syntax for directly declaring an array with a enumeration index (though there ought to be).

To preempt one issue, EnumMap won't work for the transition table, because the key required is a pair of enumeration values, not a single one.

enum State {
    Initial( false ),
    Final( true ),
    Error( false );
    static public final Integer length = 1 + Error.ordinal();

    final boolean accepting;

    State( boolean accepting ) {
        this.accepting = accepting;
    }
}

enum Symbol {
    A, B, C;
    static public final Integer length = 1 + C.ordinal();
}

State transition[][] = {
    //  A               B               C
    {
        State.Initial,  State.Final,    State.Error
    }, {
        State.Final,    State.Initial,  State.Error
    }
};

How to get the contents of a webpage in a shell variable?

There is the wget command or the curl.

You can now use the file you downloaded with wget. Or you can handle a stream with curl.


Resources :

Check if a Postgres JSON array contains a string

Not smarter but simpler:

select info->>'name' from rabbits WHERE info->>'food' LIKE '%"carrots"%';

Cannot perform runtime binding on a null reference, But it is NOT a null reference

You must define states not equal to null..

@if (ViewBag.States!= null)
{
    @foreach (KeyValuePair<int, string> de in ViewBag.States)
    {
        value="@de.Key">@de.Value 
    }
}                                

Make elasticsearch only return certain fields?

For the ES versions 5.X and above you can a ES query something like this:

    GET /.../...
    {
      "_source": {
        "includes": [ "FIELD1", "FIELD2", "FIELD3" ... " ]
      },
      .
      .
      .
      .
    }

What command means "do nothing" in a conditional in Bash?

Although I'm not answering the original question concering the no-op command, many (if not most) problems when one may think "in this branch I have to do nothing" can be bypassed by simply restructuring the logic so that this branch won't occur.

I try to give a general rule by using the OPs example

do nothing when $a is greater than "10", print "1" if $a is less than "5", otherwise, print "2"

we have to avoid a branch where $a gets more than 10, so $a < 10 as a general condition can be applied to every other, following condition.

In general terms, when you say do nothing when X, then rephrase it as avoid a branch where X. Usually you can make the avoidance happen by simply negating X and applying it to all other conditions.

So the OPs example with the rule applied may be restructured as:

if [ "$a" -lt 10 ] && [ "$a" -le 5 ]
then
    echo "1"
elif [ "$a" -lt 10 ]
then
    echo "2"
fi

Just a variation of the above, enclosing everything in the $a < 10 condition:

if [ "$a" -lt 10 ]
then
    if [ "$a" -le 5 ]
    then
        echo "1"
    else
        echo "2"
    fi
fi

(For this specific example @Flimzys restructuring is certainly better, but I wanted to give a general rule for all the people searching how to do nothing.)

How to install Guest addition in Mac OS as guest and Windows machine as host

You need to update your virtualbox sw. On new version, there is VBoxDarwinAdditions.pkg included in a additions iso image, in older versions is missing.

HttpServletRequest get JSON POST data

Are you posting from a different source (so different port, or hostname)? If so, this very very recent topic I just answered might be helpful.

The problem was the XHR Cross Domain Policy, and a useful tip on how to get around it by using a technique called JSONP. The big downside is that JSONP does not support POST requests.

I know in the original post there is no mention of JavaScript, however JSON is usually used for JavaScript so that's why I jumped to that conclusion

How can I disable the bootstrap hover color for links?

I am not a Bootstrap expert, but it sounds to me that you should define a new class called nohover (or something equivalent) then in your link code add the class as the last attribute value:

<a class="green nohover" href="#">green text</a>
<a class="yellow nohover" href="#">yellow text</a>

Then in your Bootstrap LESS/CSS file, define nohover (using the JSFiddle example above):

a:hover { color: red  }
/* Green */
a.green  { color: green; }
/* Yellow */
a.yellow  { color: yellow; }
a.nohover:hover { color: none;  }

Forked the JSFiddle here: http://jsfiddle.net/9rpkq/

Laravel: Using try...catch with DB::transaction()

If you use PHP7, use Throwable in catch for catching user exceptions and fatal errors.

For example:

DB::beginTransaction();

try {
    DB::insert(...);    
    DB::commit();
} catch (\Throwable $e) {
    DB::rollback();
    throw $e;
}

If your code must be compartable with PHP5, use Exception and Throwable:

DB::beginTransaction();

try {
    DB::insert(...);    
    DB::commit();
} catch (\Exception $e) {
    DB::rollback();
    throw $e;
} catch (\Throwable $e) {
    DB::rollback();
    throw $e;
}

CSS blur on background image but not on content

Add another div or img to your main div and blur that instead. jsfiddle

.blur {
    background:url('http://i0.kym-cdn.com/photos/images/original/000/051/726/17-i-lol.jpg?1318992465') no-repeat center;
    background-size:cover;
    -webkit-filter: blur(13px);
    -moz-filter: blur(13px);
    -o-filter: blur(13px);
    -ms-filter: blur(13px);
    filter: blur(13px);
    position:absolute;
    width:100%;
    height:100%;
}

How to generate a random string of a fixed length in Go?

Two possible options (there might be more of course):

  1. You can use the crypto/rand package that supports reading random byte arrays (from /dev/urandom) and is geared towards cryptographic random generation. see http://golang.org/pkg/crypto/rand/#example_Read . It might be slower than normal pseudo-random number generation though.

  2. Take a random number and hash it using md5 or something like this.

Reactjs setState() with a dynamic key name?

With ES6+ you can just do [${variable}]

Inheritance with base class constructor with parameters

I could be wrong, but I believe since you are inheriting from foo, you have to call a base constructor. Since you explicitly defined the foo constructor to require (int, int) now you need to pass that up the chain.

public bar(int a, int b) : base(a, b)
{
     c = a * b;
}

This will initialize foo's variables first and then you can use them in bar. Also, to avoid confusion I would recommend not naming parameters the exact same as the instance variables. Try p_a or something instead, so you won't accidentally be handling the wrong variable.

Get distance between two points in canvas

To find the distance between 2 points, you need to find the length of the hypotenuse in a right angle triangle with a width and height equal to the vertical and horizontal distance:

Math.hypot(endX - startX, endY - startY)

Get image dimensions

You can use the getimagesize function like this:

list($width, $height) = getimagesize('path to image');
echo "width: " . $width . "<br />";
echo "height: " .  $height;

Ruby on Rails generates model field:type - what are the options for field:type?

There are lots of data types you can mention while creating model, some examples are:

:primary_key, :string, :text, :integer, :float, :decimal, :datetime, :timestamp, :time, :date, :binary, :boolean, :references

syntax:

field_type:data_type

Database Structure for Tree Data Structure

You mention the most commonly implemented, which is Adjacency List: https://blogs.msdn.microsoft.com/mvpawardprogram/2012/06/25/hierarchies-convert-adjacency-list-to-nested-sets

There are other models as well, including materialized path and nested sets: http://communities.bmc.com/communities/docs/DOC-9902

Joe Celko has written a book on this subject, which is a good reference from a general SQL perspective (it is mentioned in the nested set article link above).

Also, Itzik Ben-Gann has a good overview of the most common options in his book "Inside Microsoft SQL Server 2005: T-SQL Querying".

The main things to consider when choosing a model are:

1) Frequency of structure change - how frequently does the actual structure of the tree change. Some models provide better structure update characteristics. It is important to separate structure changes from other data changes however. For example, you may want to model a company's organizational chart. Some people will model this as an adjacency list, using the employee ID to link an employee to their supervisor. This is usually a sub-optimal approach. An approach that often works better is to model the org structure separate from employees themselves, and maintain the employee as an attribute of the structure. This way, when an employee leaves the company, the organizational structure itself does not need to be changes, just the association with the employee that left.

2) Is the tree write-heavy or read-heavy - some structures work very well when reading the structure, but incur additional overhead when writing to the structure.

3) What types of information do you need to obtain from the structure - some structures excel at providing certain kinds of information about the structure. Examples include finding a node and all its children, finding a node and all its parents, finding the count of child nodes meeting certain conditions, etc. You need to know what information will be needed from the structure to determine the structure that will best fit your needs.

How to get a json string from url?

AFAIK JSON.Net does not provide functionality for reading from a URL. So you need to do this in two steps:

using (var webClient = new System.Net.WebClient()) {
    var json = webClient.DownloadString(URL);
    // Now parse with JSON.Net
}

How to get week number in Python?

userInput = input ("Please enter project deadline date (dd/mm/yyyy/): ")

import datetime

currentDate = datetime.datetime.today()

testVar = datetime.datetime.strptime(userInput ,"%d/%b/%Y").date()

remainDays = testVar - currentDate.date()

remainWeeks = (remainDays.days / 7.0) + 1


print ("Please pay attention for deadline of project X in days and weeks are  : " ,(remainDays) , "and" ,(remainWeeks) , "Weeks ,\nSo  hurryup.............!!!") 

How do I schedule a task to run at periodic intervals?

timer.scheduleAtFixedRate( new Task(), 1000,3000); 

How do I pull my project from github?

You Can do by Two ways,

1. Cloning the Remote Repo to your Local host

example: git clone https://github.com/user-name/repository.git

2. Pulling the Remote Repo to your Local host

First you have to create a git local repo by,

example: git init or git init repo-name then, git pull https://github.com/user-name/repository.git

That's all, All commits and branch in the remote repo now available in the local repository of your computer.

Happy Coding, cheers -:)

Return value from nested function in Javascript

you have to call a function before it can return anything.

function mainFunction() {
      function subFunction() {
            var str = "foo";
            return str;
      }
      return subFunction();
}

var test = mainFunction();
alert(test);

Or:

function mainFunction() {
      function subFunction() {
            var str = "foo";
            return str;
      }
      return subFunction;
}

var test = mainFunction();
alert( test() );

for your actual code. The return should be outside, in the main function. The callback is called somewhere inside the getLocations method and hence its return value is not recieved inside your main function.

function reverseGeocode(latitude,longitude){
    var address = "";
    var country = "";
    var countrycode = "";
    var locality = "";

    var geocoder = new GClientGeocoder();
    var latlng = new GLatLng(latitude, longitude);

    geocoder.getLocations(latlng, function(addresses) {
     address = addresses.Placemark[0].address;
     country = addresses.Placemark[0].AddressDetails.Country.CountryName;
     countrycode = addresses.Placemark[0].AddressDetails.Country.CountryNameCode;
     locality = addresses.Placemark[0].AddressDetails.Country.AdministrativeArea.SubAdministrativeArea.Locality.LocalityName;
    });   
    return country
   }

How to change color in circular progress bar?

check this answer out:

for me, these two lines had to be there for it to work and change the color:

android:indeterminateTint="@color/yourColor"
android:indeterminateTintMode="src_in"

PS: but its only available from android 21

How to redirect verbose garbage collection output to a file?

If in addition you want to pipe the output to a separate file, you can do:

On a Sun JVM:

-Xloggc:C:\whereever\jvm.log -verbose:gc -XX:+PrintGCDateStamps

ON an IBM JVM:

-Xverbosegclog:C:\whereever\jvm.log 

jquery multiple checkboxes array

var checked = []
$("input[name='options[]']:checked").each(function ()
{
    checked.push(parseInt($(this).val()));
});

Why do symbols like apostrophes and hyphens get replaced with black diamonds on my website?

What I really don't understand with this kind of problem is that the html page I ran as a local file displayed perfectly in Chromium browser, but as soon as I uploaded it to my website, it produced this error.

Even stranger, it displayed perfectly in the Vivaldi browser whether displayed from the local or remote file.

Is this something to do with the way Chromium reads the character set? But why only with a remote file?

I fixed the problem by retyping the text in a simple text editor and making sure the single quote mark was the one I used.

Get model's fields in Django

How about this one.

fields = Model._meta.fields

ReactJs: What should the PropTypes be for this.props.children?

Example:

import React from 'react';
import PropTypes from 'prop-types';

class MenuItem extends React.Component {
    render() {
        return (
            <li>
                <a href={this.props.href}>{this.props.children}</a>
            </li>
        );
    }
}

MenuItem.defaultProps = {
    href: "/",
    children: "Main page"
};

MenuItem.propTypes = {
    href: PropTypes.string.isRequired,
    children: PropTypes.string.isRequired
};

export default MenuItem;

Picture: Shows you error in console if the expected type is different

Picture: Shows you error in console if the expected type is different

Easiest way to loop through a filtered list with VBA?

I used the RowHeight property of a range (which means cells as well). If it's zero then it's hidden. So just loop through all rows as you would normally but in the if condition check for that property as in If myRange.RowHeight > 0 then DoStuff where DoStuff is something you want to do with the visible cells.

How to loop over files in directory and change path and add suffix to filename

You can use finds null separated output option with read to iterate over directory structures safely.

#!/bin/bash
find . -type f -print0 | while IFS= read -r -d $'\0' file; 
  do echo "$file" ;
done

So for your case

#!/bin/bash
find . -maxdepth 1 -type f  -print0 | while IFS= read -r -d $'\0' file; do
  for ((i=0; i<=3; i++)); do
    ./MyProgram.exe "$file" 'Logs/'"`basename "$file"`""$i"'.txt'
  done
done

additionally

#!/bin/bash
while IFS= read -r -d $'\0' file; do
  for ((i=0; i<=3; i++)); do
    ./MyProgram.exe "$file" 'Logs/'"`basename "$file"`""$i"'.txt'
  done
done < <(find . -maxdepth 1 -type f  -print0)

will run the while loop in the current scope of the script ( process ) and allow the output of find to be used in setting variables if needed

JPA Query selecting only specific columns without using Criteria Query?

Yes, it is possible. All you have to do is change your query to something like SELECT i.foo, i.bar FROM ObjectName i WHERE i.id = 10. The result of the query will be a List of array of Object. The first element in each array is the value of i.foo and the second element is the value i.bar. See the relevant section of JPQL reference.

How to replace a set of tokens in a Java String?

The following replaces variables of the form <<VAR>>, with values looked up from a Map. You can test it online here

For example, with the following input string

BMI=(<<Weight>>/(<<Height>>*<<Height>>)) * 70
Hi there <<Weight>> was here

and the following variable values

Weight, 42
Height, HEIGHT 51

outputs the following

BMI=(42/(HEIGHT 51*HEIGHT 51)) * 70

Hi there 42 was here

Here's the code

  static Pattern pattern = Pattern.compile("<<([a-z][a-z0-9]*)>>", Pattern.CASE_INSENSITIVE);

  public static String replaceVarsWithValues(String message, Map<String,String> varValues) {
    try {
      StringBuffer newStr = new StringBuffer(message);
      int lenDiff = 0;
      Matcher m = pattern.matcher(message);
      while (m.find()) {
        String fullText = m.group(0);
        String keyName = m.group(1);
        String newValue = varValues.get(keyName)+"";
        String replacementText = newValue;
        newStr = newStr.replace(m.start() - lenDiff, m.end() - lenDiff, replacementText);
        lenDiff += fullText.length() - replacementText.length();
      }
      return newStr.toString();
    } catch (Exception e) {
      return message;
    }
  }


  public static void main(String args[]) throws Exception {
      String testString = "BMI=(<<Weight>>/(<<Height>>*<<Height>>)) * 70\n\nHi there <<Weight>> was here";
      HashMap<String,String> values = new HashMap<>();
      values.put("Weight", "42");
      values.put("Height", "HEIGHT 51");
      System.out.println(replaceVarsWithValues(testString, values));
  }

and although not requested, you can use a similar approach to replace variables in a string with properties from your application.properties file, though this may already be being done:

private static Pattern patternMatchForProperties =
      Pattern.compile("[$][{]([.a-z0-9_]*)[}]", Pattern.CASE_INSENSITIVE);

protected String replaceVarsWithProperties(String message) {
    try {
      StringBuffer newStr = new StringBuffer(message);
      int lenDiff = 0;
      Matcher m = patternMatchForProperties.matcher(message);
      while (m.find()) {
        String fullText = m.group(0);
        String keyName = m.group(1);
        String newValue = System.getProperty(keyName);
        String replacementText = newValue;
        newStr = newStr.replace(m.start() - lenDiff, m.end() - lenDiff, replacementText);
        lenDiff += fullText.length() - replacementText.length();
      }
      return newStr.toString();
    } catch (Exception e) {
      return message;
    }
  }

Map a 2D array onto a 1D array

It's important to store the data in a way that it can be retrieved in the languages used. C-language stores in row-major order (all of first row comes first, then all of second row,...) with every index running from 0 to it's dimension-1. So the order of array x[2][3] is x[0][0], x[0][1], x[0][2], x[1][0], x[1][1], x[1][2]. So in C language, x[i][j] is stored the same place as a 1-dimensional array entry x1dim[ i*3 +j]. If the data is stored that way, it is easy to retrieve in C language.

Fortran and MATLAB are different. They store in column-major order (all of first column comes first, then all of second row,...) and every index runs from 1 to it's dimension. So the index order is the reverse of C and all the indices are 1 greater. If you store the data in the C language order, FORTRAN can find X_C_language[i][j] using X_FORTRAN(j+1, i+1). For instance, X_C_language[1][2] is equal to X_FORTRAN(3,2). In 1-dimensional arrays, that data value is at X1dim_C_language[2*Cdim2 + 3], which is the same position as X1dim_FORTRAN(2*Fdim1 + 3 + 1). Remember that Cdim2 = Fdim1 because the order of indices is reversed.

MATLAB is the same as FORTRAN. Ada is the same as C except the indices normally start at 1. Any language will have the indices in one of those C or FORTRAN orders and the indices will start at 0 or 1 and can be adjusted accordingly to get at the stored data.

Sorry if this explanation is confusing, but I think it is accurate and important for a programmer to know.

how to convert object to string in java

You can create toString() method to convert object to string.

int bid;
String bname;
double bprice;

Book(String str)
{
    String[] s1 = str.split("-");
    bid = Integer.parseInt(s1[0]);
    bname = s1[1];
    bprice = Double.parseDouble(s1[2]);
}

public String toString()
{
    return bid+"-"+bname+"-"+bprice;
}   

public static void main(String[] s)
{
    Book b1 = new Book("12-JAVA-200.50");
    System.out.println(b1);
}

Open images? Python

if location == a2:
    img = Image.open("picture.jpg")
    Img.show

Make sure the name of the image is in parantheses this should work

Get current URL with jQuery?

SHORTEST way (11 chars) in which you can do it is

_x000D_
_x000D_
let myUrl = ''+location_x000D_
_x000D_
console.log(myUrl);
_x000D_
_x000D_
_x000D_

Twitter Bootstrap date picker

Create a custom theme with themeroller, then on the download page, choose 'Advanced Theme Settings'. Set the CSS scope to 'body'. Since the CSS rules you download will be prefixed with the body tag selector, they'll have higher specificity and will override bootstrap rules.

How to create local notifications?

In appdelegate.m file write the follwing code in applicationDidEnterBackground to get the local notification

- (void)applicationDidEnterBackground:(UIApplication *)application
{
   UILocalNotification *notification = [[UILocalNotification alloc]init];
   notification.repeatInterval = NSDayCalendarUnit;
   [notification setAlertBody:@"Hello world"];
   [notification setFireDate:[NSDate dateWithTimeIntervalSinceNow:1]];
   [notification setTimeZone:[NSTimeZone  defaultTimeZone]];
   [application setScheduledLocalNotifications:[NSArray arrayWithObject:notification]];
}

Why is my element value not getting changed? Am I using the wrong function?

Sounds like we need to assume that your textbox name and ID are both set to "Tue." If that's the case, try using a lower-case V on .value.

Why doesn't indexOf work on an array IE8?

If you're using jQuery and want to keep using indexOf without worrying about compatibility issues, you can do this :

if (!Array.prototype.indexOf) {
    Array.prototype.indexOf = function(val) {
        return jQuery.inArray(val, this);
    };
}

This is helpful when you want to keep using indexOf but provide a fallback when it's not available.

How to read a Parquet file into Pandas DataFrame?

pandas 0.21 introduces new functions for Parquet:

pd.read_parquet('example_pa.parquet', engine='pyarrow')

or

pd.read_parquet('example_fp.parquet', engine='fastparquet')

The above link explains:

These engines are very similar and should read/write nearly identical parquet format files. These libraries differ by having different underlying dependencies (fastparquet by using numba, while pyarrow uses a c-library).

Java String array: is there a size of method?

array.length

It is actually a final member of the array, not a method.

html select option separator

If you don't want to use the optgroup element, put the dashes in an option element instead and give it the disabled attribute. It will be visible, but greyed out.

<option disabled>----------</option>

What causes a SIGSEGV

The initial source cause can also be an out of memory.

regular expression for anything but an empty string

Create "regular expression to detect empty string", and then inverse it. Invesion of regular language is the regular language. I think regular expression library in what you leverage - should support it, but if not you always can write your own library.

grep --invert-match

Loop in Jade (currently known as "Pug") template engine

Using node I have a collection of stuff @stuff and access it like this:

- each stuff in stuffs
  p
    = stuff.sentence

Print text instead of value from C enum

Enumerations in C are numbers that have convenient names inside your code. They are not strings, and the names assigned to them in the source code are not compiled into your program, and so they are not accessible at runtime.

The only way to get what you want is to write a function yourself that translates the enumeration value into a string. E.g. (assuming here that you move the declaration of enum Days outside of main):

const char* getDayName(enum Days day) 
{
   switch (day) 
   {
      case Sunday: return "Sunday";
      case Monday: return "Monday";
      /* etc... */
   }
}

/* Then, later in main: */
printf("%s", getDayName(TheDay));

Alternatively, you could use an array as a map, e.g.

const char* dayNames[] = {"Sunday", "Monday", "Tuesday", /* ... etc ... */ };

/* ... */

printf("%s", dayNames[TheDay]);

But here you would probably want to assign Sunday = 0 in the enumeration to be safe... I'm not sure if the C standard requires compilers to begin enumerations from 0, although most do (I'm sure someone will comment to confirm or deny this).

Add leading zeroes/0's to existing Excel values to certain length

=TEXT(A1,"0000")

However the TEXT function is able to do other fancy stuff like date formating, aswell.

How to reliably open a file in the same directory as a Python script

I'd do it this way:

from os.path import abspath, exists

f_path = abspath("fooabar.txt")

if exists(f_path):
    with open(f_path) as f:
        print f.read()

The above code builds an absolute path to the file using abspath and is equivalent to using normpath(join(os.getcwd(), path)) [that's from the pydocs]. It then checks if that file actually exists and then uses a context manager to open it so you don't have to remember to call close on the file handle. IMHO, doing it this way will save you a lot of pain in the long run.

Bootstrap: Open Another Modal in Modal

Twitter docs says custom code is required...

This works with no extra JavaScript, though, custom CSS would be highly recommended...

_x000D_
_x000D_
<link href="http://netdna.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/>_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<script src="//netdna.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>_x000D_
<!-- Button trigger modal -->_x000D_
    <button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#modalOneModal">_x000D_
      Launch demo modal_x000D_
    </button> _x000D_
            <!-- Modal -->_x000D_
            <div class="modal fade bg-info" id="modalOneModal" tabindex="-1" role="dialog" aria-labelledby="modalOneLabel" aria-hidden="true">_x000D_
    _x000D_
              <div class="modal-dialog">_x000D_
          _x000D_
                <div class="modal-content  bg-info">_x000D_
                  <div class="modal-header btn-info">_x000D_
                    <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>_x000D_
                    <h4 class="modal-title" id="modalOneLabel">modalOne</h4>_x000D_
                  </div>_x000D_
                  <div id="thismodalOne" class="modal-body bg-info">_x000D_
                _x000D_
                _x000D_
              <!-- Button trigger modal -->_x000D_
    <button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#twoModalsExample">_x000D_
      Launch demo modal_x000D_
    </button>_x000D_
             _x000D_
                    <div class="modal fade bg-info" id="twoModalsExample" style="overflow:auto" tabindex="-1" role="dialog" aria-hidden="true">_x000D_
                <h3>EXAMPLE</h3>_x000D_
            </div>_x000D_
                  </div>_x000D_
                  <div class="modal-footer btn-info" id="woModalFoot">_x000D_
                    <button type="button" class="btn btn-info" data-dismiss="modal">Close</button>_x000D_
                  </div>_x000D_
                </div>_x000D_
              </div>_x000D_
            </div>_x000D_
    <!-- End Form Modals -->
_x000D_
_x000D_
_x000D_

Where is the web server root directory in WAMP?

To check what is your root directory go to httpd.conf file of apache and search for "DocumentRoot".The location following it is your root directory

Systrace for Windows

strace supported By Git,as Michael Fox Mention Maybe not useful for complex/windows software.

Adjusting the Xcode iPhone simulator scale and size

You are seeing it huge because of your screen resolution. iPhone 5's display is 640x1136. Current resolution of your display can be found in System preferences, and it's height on notebooks is usually around 1000 px (give or take). So surely, the simulator in 1:1 scale will take all the height of the screen and even more.

The iPhone simulator has three scales, 100%, 75% and 50%. You can change between them any time by pressing CMD+1, CMD+2, CMD+3 or from Window menu.

Note that 100%-mode is very helpful for graphic checks, on full resolution you will be able to notice all defects or measure point size of the elements.

Python mysqldb: Library not loaded: libmysqlclient.18.dylib

when you are in El Capitan, will get error: ln: /usr/lib/libmysqlclient.18.dylib: Operation not permitted need to close the "System Integrity Protection".

first, reboot and hold on cmd + R to enter the Recovery mode, then launch the terminal and type the command: csrutil disable, now you can reboot and try again.

Error in setting JAVA_HOME

The JAVA_HOME should point to the JDK home rather than the JRE home if you are going to be compiling stuff, likewise - I would try and install the JDK in a directory that doesn't include a space. Even if this is not your problem now, it can cause problems in the future!

Error Code 1292 - Truncated incorrect DOUBLE value - Mysql

If you don't have double value field or data, maybe you should try to disable sql strict mode.

To do that you have to edit "my.ini" file located in MySQL installation folder, find "Set the SQL mode to strict" line and change the below line:

# Set the SQL mode to strict
sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"

to this, deleting "STRICT_TRANS_TABLES"

# Set the SQL mode to strict
sql-mode="NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"

After that, you have to restart MySQL service to enable this change.

To check the change, open the editor an execute this sql sentence:

SHOW VARIABLES LIKE 'sql_mode';

Very Important: Be careful of the file format after saving. Save it as "UTF8" and don't as "TFT8 with BOM" because the service will not restart.

How to view hierarchical package structure in Eclipse package explorer

For Eclipse in Macbook it is just 2 click process:

  • Click on view menu (3 dot symbol) in package explorer -> hover over package presentation -> Click on Hierarchical

enter image description here

How do I get the current date in JavaScript?

If you want a simple DD/MM/YYYY format, I've just come up with this simple solution, although it doesn't prefix missing zeros.

_x000D_
_x000D_
var d = new Date();_x000D_
document.write( [d.getDate(), d.getMonth()+1, d.getFullYear()].join('/') );
_x000D_
_x000D_
_x000D_

javascript function wait until another function to finish

Following answer can help in this and other similar situations like synchronous AJAX call -

Working example

waitForMe().then(function(intentsArr){
  console.log('Finally, I can execute!!!');
},
function(err){
  console.log('This is error message.');
})

function waitForMe(){
    // Returns promise
    console.log('Inside waitForMe');
    return new Promise(function(resolve, reject){
        if(true){ // Try changing to 'false'
            setTimeout(function(){
                console.log('waitForMe\'s function succeeded');
                resolve();
            }, 2500);
        }
        else{
            setTimeout(function(){
                console.log('waitForMe\'s else block failed');
                resolve();
            }, 2500);
        }
    });
}

Displaying output of a remote command with Ansible

If you pass the -v flag to the ansible-playbook command, then ansible will show the output on your terminal.

For your use case, you may want to try using the fetch module to copy the public key from the server to your local machine. That way, it will only show a "changed" status when the file changes.

Deploying Java webapp to Tomcat 8 running in Docker container

You are trying to copy the war file to a directory below webapps. The war file should be copied into the webapps directory.

Remove the mkdir command, and copy the war file like this:

COPY /1.0-SNAPSHOT/my-app-1.0-SNAPSHOT.war /usr/local/tomcat/webapps/myapp.war

Tomcat will extract the war if autodeploy is turned on.

How do I capture the output of a script if it is being ran by the task scheduler?

Use the cmd.exe command processor to build a timestamped file name to log your scheduled task's output

To build upon answers by others here, it may be that you want to create an output file that has the date and/or time embedded in the name of the file. You can use the cmd.exe command processor to do this for you.

Note: This technique takes the string output of internal Windows environment variables and slices them up based on character position. Because of this, the exact values supplied in the examples below may not be correct for the region of Windows you use. Also, with some regional settings, some components of the date or time may introduce a space into the constructed file name when their value is less than 10. To mitigate this issue, surround your file name with quotes so that any unintended spaces in the file name won't break the command-line you're constructing. Experiment and find what works best for your situation.

Be aware that PowerShell is more powerful than cmd.exe. One way it is more powerful is that it can deal with different Windows regions. But this answer is about solving this issue using cmd.exe, not PowerShell, so we continue.

Using cmd.exe

You can access different components of the date and time by slicing the internal environment variables %date% and %time%, as follows (again, the exact slicing values are dependent on the region configured in Windows):

  • Year (4 digits): %date:~10,4%
  • Month (2 digits): %date:~4,2%
  • Day (2 digits): %date:~7,2%
  • Hour (2 digits): %time:~0,2%
  • Minute (2 digits): %time:~3,2%
  • Second (2 digits): %time:~6,2%

Suppose you want your log file to be named using this date/time format: "Log_[yyyyMMdd]_[hhmmss].txt". You'd use the following:

Log_%date:~10,4%%date:~4,2%%date:~7,2%_%time:~0,2%%time:~3,2%%time:~6,2%.txt

To test this, run the following command line:

cmd.exe /c echo "Log_%date:~10,4%%date:~4,2%%date:~7,2%_%time:~0,2%%time:~3,2%%time:~6,2%.txt"

Putting it all together, to redirect both stdout and stderr from your script to a log file named with the current date and time, use might use the following as your command line:

cmd /c YourProgram.cmd > "Log_%date:~10,4%%date:~4,2%%date:~7,2%_%time:~0,2%%time:~3,2%%time:~6,2%.txt" 2>&1

Note the use of quotes around the file name to handle instances a date or time component may introduce a space character.

In my case, if the current date/time were 10/05/2017 9:05:34 AM, the above command-line would produce the following:

cmd /c YourProgram.cmd > "Log_20171005_ 90534.txt" 2>&1

How to make script execution wait until jquery is loaded

edit

Could you try the correct type for your script tags? I see you use text/Scripts, which is not the right mimetype for javascript.

Use this:

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script> 
<script type="text/javascript" src="../Scripts/jquery.dropdownPlain.js"></script>
<script type="text/javascript" src="../Scripts/facebox.js"></script>

end edit

or you could take a look at require.js which is a loader for your javascript code.

depending on your project, this could however be a bit overkill

Checking length of dictionary object

var c = {'a':'A', 'b':'B', 'c':'C'};
var count = 0;
for (var i in c) {
   if (c.hasOwnProperty(i)) count++;
}

alert(count);

Postgresql -bash: psql: command not found

The question is for linux but I had the same issue with git bash on my Windows machine.

My pqsql is installed here: C:\Program Files\PostgreSQL\10\bin\psql.exe

You can add the location of psql.exe to your Path environment variable as shown in this screenshot:

add psql.exe to your Path environment variable

After changing the above, please close all cmd and/or bash windows, and re-open them (as mentioned in the comments @Ayush Shankar)

You might need to change default logging user using below command.

psql -U postgres

Here postgres is the username. Without -U, it will pick the windows loggedin user.

Single quotes vs. double quotes in Python

In Perl you want to use single quotes when you have a string which doesn't need to interpolate variables or escaped characters like \n, \t, \r, etc.

PHP makes the same distinction as Perl: content in single quotes will not be interpreted (not even \n will be converted), as opposed to double quotes which can contain variables to have their value printed out.

Python does not, I'm afraid. Technically seen, there is no $ token (or the like) to separate a name/text from a variable in Python. Both features make Python more readable, less confusing, after all. Single and double quotes can be used interchangeably in Python.

If "0" then leave the cell blank

Your question is missing most of the necessary information, so I'm going to make some assumptions:

  1. Column H is your total summation
  2. You're putting this formula into H16
  3. Column G is additions to your summation
  4. Column F is deductions from your summation
  5. You want to leave the summation cell blank if there isn't a debit or credit entered

The answer would be:

=IF(COUNTBLANK(F16:G16)<>2,H15+G16-F16,"")

COUNTBLANK tells you how many cells are unfilled or set to "".
IF lets you conditionally do one of two things based on whether the first statement is true or false. The second comma separated argument is what to do if it's true, the third comma separated argument is what to do if it's false.
<> means "not equal to".

The equation says that if the number of blank cells in the range F16:G16 (your credit and debit cells) is not 2, which means both aren't blank, then calculate the equation you provided in your question. Otherwise set the cell to blank("").
When you copy this equation to new cells in column H other than H16, it will update the row references so the proper rows for the credit and debit amounts are looked at.

CAVEAT: This equation is useful if you are just adding entries for credits and debits to the end of a list and want the running total to update automatically. You'd fill this equation down to some arbitrary long length well past the end of actual data. You wouldn't see the running total past the end of the credit/debit entries then, it would just be blank until you filled in a new credit/debit entry. If you left a blank row in your credit debit entries though, the reference to the previous total, H15, would report blank, which is treated like a 0 in this case.

How do you do relative time in Rails?

I've written this, but have to check the existing methods mentioned to see if they are better.

module PrettyDate
  def to_pretty
    a = (Time.now-self).to_i

    case a
      when 0 then 'just now'
      when 1 then 'a second ago'
      when 2..59 then a.to_s+' seconds ago' 
      when 60..119 then 'a minute ago' #120 = 2 minutes
      when 120..3540 then (a/60).to_i.to_s+' minutes ago'
      when 3541..7100 then 'an hour ago' # 3600 = 1 hour
      when 7101..82800 then ((a+99)/3600).to_i.to_s+' hours ago' 
      when 82801..172000 then 'a day ago' # 86400 = 1 day
      when 172001..518400 then ((a+800)/(60*60*24)).to_i.to_s+' days ago'
      when 518400..1036800 then 'a week ago'
      else ((a+180000)/(60*60*24*7)).to_i.to_s+' weeks ago'
    end
  end
end

Time.send :include, PrettyDate

UIView's frame, bounds, center, origin, when to use what?

They are related values, and kept consistent by the property setter/getter methods (and using the fact that frame is a purely synthesized value, not backed by an actual instance variable).

The main equations are:

frame.origin = center - bounds.size / 2

(which is the same as)

center = frame.origin + bounds.size / 2

(and there’s also)

frame.size = bounds.size

That's not code, just equations to express the invariant between the three properties. These equations also assume your view's transform is the identity, which it is by default. If it's not, then bounds and center keep the same meaning, but frame can change. Unless you're doing non-right-angle rotations, the frame will always be the transformed view in terms of the superview's coordinates.

This stuff is all explained in more detail with a useful mini-library here:

http://bynomial.com/blog/?p=24

SELECT query with CASE condition and SUM()

Use an "Or"

Select SUM(CAmount) as PaymentAmount 
from TableOrderPayment 
where (CPaymentType='Check' Or CPaymentType='Cash')
   and CDate <= case CPaymentType When 'Check' Then SYSDATETIME() else CDate End
   and CStatus='" & "Active" & "'"

or an "IN"

Select SUM(CAmount) as PaymentAmount 
from TableOrderPayment 
where CPaymentType IN ('Check', 'Cash')
   and CDate <= case CPaymentType When 'Check' Then SYSDATETIME() else CDate End
   and CStatus='" & "Active" & "'"

Fetch frame count with ffmpeg

try this:

ffmpeg -i "path to file" -f null /dev/null 2>&1 | grep 'frame=' | cut -f 2 -d ' '

how to clear localstorage,sessionStorage and cookies in javascript? and then retrieve?

how to completely clear localstorage

localStorage.clear();

how to completely clear sessionstorage

sessionStorage.clear();

[...] Cookies ?

var cookies = document.cookie;

for (var i = 0; i < cookies.split(";").length; ++i)
{
    var myCookie = cookies[i];
    var pos = myCookie.indexOf("=");
    var name = pos > -1 ? myCookie.substr(0, pos) : myCookie;
    document.cookie = name + "=;expires=Thu, 01 Jan 1970 00:00:00 GMT";
}

is there any way to get the value back after clear these ?

No, there isn't. But you shouldn't rely on this if this is related to a security question.

AttributeError: 'module' object has no attribute 'model'

In class poll, you inherited your class from models.model but there's no module in models called that name.

Because Python is case sensitive, you need to use the capital Model instead of model.

class poll(models.Model):
...

Convert all strings in a list to int

Here is a simple solution with explanation for your query.

 a=['1','2','3','4','5'] #The integer represented as a string in this list
 b=[] #Fresh list
 for i in a: #Declaring variable (i) as an item in the list (a).
     b.append(int(i)) #Look below for explanation
 print(b)

Here, append() is used to add items ( i.e integer version of string (i) in this program ) to the end of the list (b).

Note: int() is a function that helps to convert an integer in the form of string, back to its integer form.

Output console:

[1, 2, 3, 4, 5]

So, we can convert the string items in the list to an integer only if the given string is entirely composed of numbers or else an error will be generated.

How to close a web page on a button click, a hyperlink or a link button click?

Assuming you're using WinForms, as it was the first thing I did when I was starting C# you need to create an event to close this form.

Lets say you've got a button called myNewButton. If you double click it on WinForms designer you will create an event. After that you just have to use this.Close

    private void myNewButton_Click(object sender, EventArgs e) {
        this.Close();
    }

And that should be it.

The only reason for this not working is that your Event is detached from button. But it should create new event if old one is no longer attached when you double click on the button in WinForms designer.

Rounding SQL DateTime to midnight

SELECT getdate()

Result: 2012-12-14 16:03:33.360

SELECT convert(datetime,convert(bigint, getdate()))

Result 2012-12-15 00:00:00.000

Mask for an Input to allow phone numbers?

I do this using the TextMaskModule from 'angular2-text-mask'

Mine are split but you can get the idea

Package using NPM NodeJS

"dependencies": {
    "angular2-text-mask": "8.0.0",

HTML

<input *ngIf="column?.type =='areaCode'" type="text" [textMask]="{mask: areaCodeMask}" [(ngModel)]="areaCodeModel">


<input *ngIf="column?.type =='phone'" type="text" [textMask]="{mask: phoneMask}" [(ngModel)]="phoneModel"> 

Inside Component

public areaCodeModel = '';
public areaCodeMask = ['(', /[1-9]/, /\d/, /\d/, ')'];

public phoneModel = '';
public phoneMask = [/\d/, /\d/, /\d/, '-', /\d/, /\d/, /\d/, /\d/];