#Istream iterator | Programs & Examples on Istream iterator

Server.UrlEncode vs. HttpUtility.UrlEncode

Keep in mind that you probably shouldn't be using either one of those methods. Microsoft's Anti-Cross Site Scripting Library includes replacements for HttpUtility.UrlEncode and HttpUtility.HtmlEncode that are both more standards-compliant, and more secure. As a bonus, you get a JavaScriptEncode method as well.

Change the Arrow buttons in Slick slider

This worked for me:

http://codepen.io/anon/pen/qNbWwK

Hide the default buttons in CSS and use:

<!-- In HTML: -->
<p class="left">left</p>
<p class="right">right</p>

/* In the JS file */
$('.slider').slick({
  arrows: false
})

$('.left').click(function(){
  $('.slider').slick('slickPrev');
})

$('.right').click(function(){
  $('.slider').slick('slickNext');
})

jQuery Find and List all LI elements within a UL within a specific DIV

$('li[rel=7]').siblings().andSelf();

// or:

$('li[rel=7]').parent().children();

Now that you added that comment explaining that you want to "form an array of rels per column", you should do this:

var rels = [];

$('ul').each(function() {
    var localRels = [];

    $(this).find('li').each(function(){
        localRels.push( $(this).attr('rel') );
    });

    rels.push(localRels);
});

Stretch background image css?

Just paste this into your line of codes:

<meta http-equiv="X-UA-Compatible" content="IE=Edge" />

NullInjectorError: No provider for AngularFirestore

I had the same issue while adding firebase to my Ionic App. To fix the issue I followed these steps:

npm install @angular/fire firebase --save

In my app/app.module.ts:

...
import { AngularFireModule } from '@angular/fire';
import { environment } from '../environments/environment';
import { AngularFirestoreModule, SETTINGS } from '@angular/fire/firestore';

@NgModule({
  declarations: [AppComponent],
  entryComponents: [],
  imports: [
    BrowserModule, 
    AppRoutingModule,
    AngularFireModule.initializeApp(environment.firebase),
    AngularFirestoreModule
  ],
  providers: [
    { provide: SETTINGS, useValue: {} }
  ],
  bootstrap: [AppComponent]
})

Previously we used FirestoreSettingsToken instead of SETTINGS. But that bug got resolved, now we use SETTINGS. (link)

In my app/services/myService.ts I imported as:

import { AngularFirestore } from "@angular/fire/firestore";

For some reason vscode was importing it as "@angular/fire/firestore/firestore";I After changing it for "@angular/fire/firestore"; the issue got resolved!

The type or namespace name does not exist in the namespace 'System.Web.Mvc'

I had the same issue, but none of the above worked for me. They did put me in to the right direction though.

For example when I set the "Copy Local" to "true" for System.Web.Mvc reference, it automatically sets it back to False.

I have multiple projects which depend on the System.Web.Mvc reference in my solution, but only one caused this problem. In VS 2012 this reference is labeled with the yellow attention triangle.

Find this reference => remove it => re-add it

That fixed it for me. Hope this helps

How display only years in input Bootstrap Datepicker?

format: "YYYY"

Should be capital instead of "yyyy"

Append to string variable

var str1 = 'abc';
var str2 = str1+' def'; // str2 is now 'abc def'

Vertical alignment of text and icon in button

Just wrap the button label in an extra span and add class="align-middle" to both (the icon and the label). This will center your icon with text vertical.

<button id="edit-listing-form-house_Continue" 
    class="btn btn-large btn-primary"
    style=""
    value=""
    name="Continue"
    type="submit">
<span class="align-middle">Continue</span>
<i class="icon-ok align-middle" style="font-size:40px;"></i>

What is the 'open' keyword in Swift?

open is only for another module for example: cocoa pods, or unit test, we can inherit or override

How to completely DISABLE any MOUSE CLICK

You can overlay a big, semi-transparent <div> that takes all the clicks. Just append a new <div> to <body> with this style:

.overlay {
    background-color: rgba(1, 1, 1, 0.7);
    bottom: 0;
    left: 0;
    position: fixed;
    right: 0;
    top: 0;
}

Is it possible to pull just one file in Git?

@Mawardy's answer worked for me, but my changes were on the remote so I had to specify the origin

git checkout origin/master -- {filename}

Error : getaddrinfo ENOTFOUND registry.npmjs.org registry.npmjs.org:443

I tried many but this worked fine for me.

npm config rm proxy
npm config rm https-proxy

above 2 commands is enough if it doesn't work try this as well.

npm config --global rm proxy
npm config --global rm https-proxy

How to show Error & Warning Message Box in .NET/ How to Customize MessageBox

Try this:

MessageBox.Show("Some text", "Some title", 
    MessageBoxButtons.OK, MessageBoxIcon.Error);

How to extract a string using JavaScript Regex?

This code works:

  let str = "governance[string_i_want]"; 
  let res = str.match(/[^governance\[](.*)[^\]]/g);

res will equal "string_i_want". However, in this example res is still an array, so do not treat res like a string.

By grouping the characters I do not want, using [^string], and matching on what is between the brackets, the code extracts the string I want!

You can try it out here: https://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_match_regexp

Good luck.

How can I switch themes in Visual Studio 2012

This worked for me ! Go to Tools->Options(Last Item)->Color theme Drop down and select any

Difference between string and char[] types in C++

Think of (char *) as string.begin(). The essential difference is that (char *) is an iterator and std::string is a container. If you stick to basic strings a (char *) will give you what std::string::iterator does. You could use (char *) when you want the benefit of an iterator and also compatibility with C, but that's the exception and not the rule. As always, be careful of iterator invalidation. When people say (char *) isn't safe this is what they mean. It's as safe as any other C++ iterator.

Apply jQuery datepicker to multiple instances

I just had the same problem.

The correct way to use date pick is $('.my_class').datepicker(); but you need to make sure you don't assign the same ID to multiple datepickers.

Git: Pull from other remote

git pull is really just a shorthand for git pull <remote> <branchname>, in most cases it's equivalent to git pull origin master. You will need to add another remote and pull explicitly from it. This page describes it in detail:

http://help.github.com/forking/

How can I change UIButton title color?

With Swift 5, UIButton has a setTitleColor(_:for:) method. setTitleColor(_:for:) has the following declaration:

Sets the color of the title to use for the specified state.

func setTitleColor(_ color: UIColor?, for state: UIControlState)

The following Playground sample code show how to create a UIbutton in a UIViewController and change it's title color using setTitleColor(_:for:):

import UIKit
import PlaygroundSupport

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = UIColor.white

        // Create button
        let button = UIButton(type: UIButton.ButtonType.system)

        // Set button's attributes
        button.setTitle("Print 0", for: UIControl.State.normal)
        button.setTitleColor(UIColor.orange, for: UIControl.State.normal)

        // Set button's frame
        button.frame.origin = CGPoint(x: 100, y: 100)
        button.sizeToFit()

        // Add action to button
        button.addTarget(self, action: #selector(printZero(_:)), for: UIControl.Event.touchUpInside)

        // Add button to subView
        view.addSubview(button)
    }

    @objc func printZero(_ sender: UIButton) {
        print("0")
    }

}

let controller = ViewController()
PlaygroundPage.current.liveView = controller

How to fix JSP compiler warning: one JAR was scanned for TLDs yet contained no TLDs?

For Tomcat 8, I had to add the following line to tomcat/conf/logging.properties for the jars scanned by Tomcat to show up in the logs:

org.apache.jasper.servlet.TldScanner.level = FINE

Cannot use a leading ../ to exit above the top directory

You can use ~/img/myImage.png instead of ../img/myImage.png to avoid this error in ASP.NET pages.

You are trying to add a non-nullable field 'new_field' to userprofile without a default

One option is to declare a default value for 'new_field':

new_field = models.CharField(max_length=140, default='DEFAULT VALUE')

another option is to declare 'new_field' as a nullable field:

new_field = models.CharField(max_length=140, null=True)

If you decide to accept 'new_field' as a nullable field you may want to accept 'no input' as valid input for 'new_field'. Then you have to add the blank=True statement as well:

new_field = models.CharField(max_length=140, blank=True, null=True)

Even with null=True and/or blank=True you can add a default value if necessary:

new_field = models.CharField(max_length=140, default='DEFAULT VALUE', blank=True, null=True)

Clearing a text field on button click

If you want to reset it, then simple use:

<input type="reset" value="Reset" />

But beware, it will not clear out textboxes that have default value. For example, if we have the following textboxes and by default, they have the following values:

<input id="textfield1" type="text" value="sample value 1" />
<input id="textfield2" type="text" value="sample value 2" />

So, to clear it out, compliment it with javascript:

function clearText()  
{
    document.getElementById('textfield1').value = "";
    document.getElementById('textfield2').value = "";
}

And attach it to onclick of the reset button:
<input type="reset" value="Reset" onclick="clearText()" />

ReactJS - How to use comments?

{ 
    // any valid js expression
}

If you wonder why does it work? it's because everything that's inside curly braces { } is a javascript expression,

so this is fine as well:

{ /*
         yet another js expression
*/ }

Fade Effect on Link Hover?

I know in the question you state "I assume JavaScript is used to create this effect" but CSS can be used too, an example is below.

CSS

.fancy-link {
   color: #333333;
   text-decoration: none;
   transition: color 0.3s linear;
   -webkit-transition: color 0.3s linear;
   -moz-transition: color 0.3s linear;
}

.fancy-link:hover {
   color: #F44336;
}

HTML

<a class="fancy-link" href="#">My Link</a>

And here is a JSFIDDLE for the above code!

Marcel in one of the answers points out you can "transition multiple CSS properties" you can also use "all" to effect the element with all your :hover styles like below.

CSS

.fancy-link {
   color: #333333;
   text-decoration: none;
   transition: all 0.3s linear;
   -webkit-transition: all 0.3s linear;
   -moz-transition: all 0.3s linear;
}

.fancy-link:hover {
   color: #F44336;
   padding-left: 10px;
}

HTML

<a class="fancy-link" href="#">My Link</a>

And here is a JSFIDDLE for the "all" example!

file_get_contents() how to fix error "Failed to open stream", "No such file"

I hope below solution will work for you all as I was having the same problem with my websites...

For : $json = json_decode(file_get_contents('http://...'));

Replace with below query

$Details= unserialize(file_get_contents('http://......'));

String replacement in Objective-C

You could use the method

- (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target 
                                        withString:(NSString *)replacement

...to get a new string with a substring replaced (See NSString documentation for others)

Example use

NSString *str = @"This is a string";

str = [str stringByReplacingOccurrencesOfString:@"string"
                                     withString:@"duck"];

Arrays.asList() of an array

Use java.utils.Arrays:

public int getTheNumber(int[] factors) {
    int[] f = (int[])factors.clone();
    Arrays.sort(f);
    return f[0]*f[(f.length-1];
}

Or if you want to be efficient avoid all the object allocation just actually do the work:

public static int getTheNumber(int[] array) {
    if (array.length == 0)
        throw new IllegalArgumentException();
    int min = array[0];
    int max = array[0];
    for (int i = 1; i< array.length;++i) {
        int v = array[i];
        if (v < min) {
            min = v;
        } else if (v > max) {
            max = v;
        }
    }
    return min * max;
}

Phonegap + jQuery Mobile, real world sample or tutorial

you may check this http://coenraets.org/blog/2011/10/sample-application-with-jquery-mobile-and-phonegap/ and you can also check http://mobile.tutsplus.com/category/tutorials/phonegap/ which provide you with a good sample

Print very long string completely in pandas dataframe

If you're using jupyter notebook, you can also print pandas dataframe as HTML table, which will print full strings.

from IPython.display import display, HTML
display(HTML(df.to_html()))

Output

    one
0   one
1   two
2   This is very long string very long string very long string veryvery long string

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

For MS access or MYSQL server

SELECT city FROM station
WHERE City LIKE '[aeiou]%'and City LIKE '%[aeiou]';

Reading a cell value in Excel vba and write in another Cell

I have this function for this case ..

Function GetValue(r As Range, Tag As String) As Integer
Dim c, nRet As String
Dim n, x As Integer
Dim bNum As Boolean

c = r.Value
n = InStr(c, Tag)
For x = n + 1 To Len(c)
  Select Case Mid(c, x, 1)
    Case ":":    bNum = True
    Case " ": Exit For
    Case Else: If bNum Then nRet = nRet & Mid(c, x, 1)
  End Select
Next
GetValue = val(nRet)
End Function

To fill cell BC .. (assumed that you check cell A1)

Worksheets("Übersicht_2013").Cells(i, "BC") = GetValue(range("A1"),"S")

Execute PHP scripts within Node.js web server

Node.js only supports JavaScript. Here is a tutorial on how to have PHP running with Node.js on the side.

http://blog.mixu.net/2011/01/04/nginx-php-fpm-and-node-js-install-on-centos-5-5/

What's the valid way to include an image with no src?

I've found that using:

<img src="file://null">

will not make a request and validates correctly.

The browsers will simply block the access to the local file system.

But there might be an error displayed in console log in Chrome for example:

Not allowed to load local resource: file://null/

Case statement in MySQL

I hope this would provide you with the right solution:

Syntax:

   CASE  
        WHEN search_condition THEN statement_list  
       [WHEN search_condition THEN statement_list]....
       [ELSE statement_list]  
   END CASE

Implementation:

select id, action_heading,  
   case when
             action_type="Expense" then action_amount  
             else NULL   
             end as Expense_amt,   
    case when  
             action_type ="Income" then action_amount  
             else NULL  
             end as Income_amt  
  from tbl_transaction;

Here I am using CASE statement as it is more flexible than if-then-else. It allows more than one branch. And CASE statement is standard SQL and works in most databases.

At runtime, find all classes in a Java application that extend a base class

The Java way to do what you want is to use the ServiceLoader mechanism.

Also many people roll their own by having a file in a well known classpath location (i.e. /META-INF/services/myplugin.properties) and then using ClassLoader.getResources() to enumerate all files with this name from all jars. This allows each jar to export its own providers and you can instantiate them by reflection using Class.forName()

Ant if else condition?

You can also do this with ant contrib's if task.

<if>
    <equals arg1="${condition}" arg2="true"/>
    <then>
        <copy file="${some.dir}/file" todir="${another.dir}"/>
    </then>
    <elseif>
        <equals arg1="${condition}" arg2="false"/>
        <then>
            <copy file="${some.dir}/differentFile" todir="${another.dir}"/>
        </then>
    </elseif>
    <else>
        <echo message="Condition was neither true nor false"/>
    </else>
</if>

Node update a specific package

Always you can do it manually. Those are the steps:

Go to the NPM package page, and search for the GitHub link.
Now download the latest version using GitHub download link, or by clonning. git clone github_url
Copy the package to your node_modules folder for e.g. node_modules/browser-sync

Now it should work for you. To be sure it will not break in the future when you do npm i, continue the upcoming two steps:

Check the version of the new package by reading the package.json file in it's folder.
Open your project package.json and set the same version for where it's appear in the dependencies part of your package.json

While it's not recommened to do it manually. Sometimes it's good to understand how things are working under the hood, to be able to fix things. I found myself doing it from time to time.

Image re-size to 50% of original size in HTML

We can do this by css3 too. Try this:

.halfsize {
    -moz-transform:scale(0.5);
    -webkit-transform:scale(0.5);
    transform:scale(0.5);
}

<img class="halfsize" src="image4.jpg">

subjected to browser compatibility

pip: no module named _internal

I have fixed this error by running the following commands:

sudo apt remove python-pip
wget https://bootstrap.pypa.io/get-pip.py
sudo python get-pip.py

It will remove the previously installed pip and reinstall it. Thanks :)

Why does comparing strings using either '==' or 'is' sometimes produce a different result?

is is identity testing, == is equality testing. what happens in your code would be emulated in the interpreter like this:

>>> a = 'pub'
>>> b = ''.join(['p', 'u', 'b'])
>>> a == b
True
>>> a is b
False

so, no wonder they're not the same, right?

In other words: a is b is the equivalent of id(a) == id(b)

PyCharm shows unresolved references error for valid code

Worked for me with much simplier action:


File > Settings > Project > Project Interpreter 
> Select "No interpreter" in the "Project interpreter" list 
> Apply > Set your python interpreter again > Click Apply

Profit - Pycharm is updating skeletons and everything is fine.

jquery click event not firing?

Might be useful to some : check for

pointer-events: none;

In the CSS. It prevents clicks from being caught by JS. I think it's relevant because the CSS might be the last place you'd look into in this kind of situation.

How to download folder from putty using ssh client

You need to use some kind of file-transfer protocol (ftp, scp, etc), putty can't send remote files back to your computer. I use Win-SCP, which has a straightforward gui. Select SCP and you should be able to log in with the same ssh credentials and on the same port (probably 22) that you use with putty.

Restoring database from .mdf and .ldf files of SQL Server 2008

I have an answer for you Yes, It is possible.

Go to

SQL Server Management Studio > select Database > click on attach

Then select and add .mdf and .ldf file. Click on OK.

C++ Array of pointers: delete or delete []?

To simplify the answare let's look on the following code:

#include "stdafx.h"
#include <iostream>
using namespace std;

class A
{
private:
    int m_id;
    static int count;
public:
    A() {count++; m_id = count;}
    A(int id) { m_id = id; }
    ~A() {cout<< "Destructor A "   <<m_id<<endl; }
};

int A::count = 0;

void f1()
{   
    A* arr = new A[10];
    //delete operate only one constructor, and crash!
    delete arr;
    //delete[] arr;
}

int main()
{
    f1();
    system("PAUSE");
    return 0;
}

The output is: Destructor A 1 and then it's crashing (Expression: _BLOCK_TYPE_IS_VALID(phead- nBlockUse)).

We need to use: delete[] arr; becuse it's delete the whole array and not just one cell!

try to use delete[] arr; the output is: Destructor A 10 Destructor A 9 Destructor A 8 Destructor A 7 Destructor A 6 Destructor A 5 Destructor A 4 Destructor A 3 Destructor A 2 Destructor A 1

The same principle is for an array of pointers:

void f2()
{
    A** arr = new A*[10];
    for(int i = 0; i < 10; i++)
    {
        arr[i] = new A(i);
    }
    for(int i = 0; i < 10; i++)
    {
        delete arr[i];//delete the A object allocations.
    }

    delete[] arr;//delete the array of pointers
}

if we'll use delete arr instead of delete[] arr. it will not delete the whole pointers in the array => memory leak of pointer objects!

Any way to replace characters on Swift String?

You can use this:

let s = "This is my string"
let modified = s.replace(" ", withString:"+")

If you add this extension method anywhere in your code:

extension String
{
    func replace(target: String, withString: String) -> String
    {
       return self.stringByReplacingOccurrencesOfString(target, withString: withString, options: NSStringCompareOptions.LiteralSearch, range: nil)
    }
}

Swift 3:

extension String
{
    func replace(target: String, withString: String) -> String
    {
        return self.replacingOccurrences(of: target, with: withString, options: NSString.CompareOptions.literal, range: nil)
    }
}

Is there an ignore command for git like there is for svn?

for names not present in the working copy or repo:

echo /globpattern >> .gitignore

or for an existing file (sh type command line):

echo /$(ls -1 file) >> .gitignore   # I use tab completion to select the file to be ignored  
git rm -r --cached file             # if already checked in, deletes it on next commit

How to sort ArrayList<Long> in decreasing order?

The following approach will sort the list in descending order and also handles the 'null' values, just in case if you have any null values then Collections.sort() will throw NullPointerException

      Collections.sort(list, new Comparator<Long>() {
          public int compare(Long o1, Long o2) {
                  return o1==null?Integer.MAX_VALUE:o2==null?Integer.MIN_VALUE:o2.compareTo(o1);

        }
    });

How do you open an SDF file (SQL Server Compact Edition)?

You can open SQL Compact 4.0 Databases from Visual Studio 2012 directly, by going to

View ->
Server Explorer ->
Data Connections ->
Add Connection...
Change... (Data Source:)
Microsoft SQL Server Compact 4.0
Browse...

and following the instructions there.

If you're okay with them being upgraded to 4.0, you can open older versions of SQL Compact Databases also - handy if you just want to have a look at some tables, etc for stuff like Windows Phone local database development.

(note I'm not sure if this requires a specific SKU of VS2012, if it helps I'm running Premium)

How to use fetch in typescript

Actually, pretty much anywhere in typescript, passing a value to a function with a specified type will work as desired as long as the type being passed is compatible.

That being said, the following works...

 fetch(`http://swapi.co/api/people/1/`)
      .then(res => res.json())
      .then((res: Actor) => {
          // res is now an Actor
      });

I wanted to wrap all of my http calls in a reusable class - which means I needed some way for the client to process the response in its desired form. To support this, I accept a callback lambda as a parameter to my wrapper method. The lambda declaration accepts an any type as shown here...

callBack: (response: any) => void

But in use the caller can pass a lambda that specifies the desired return type. I modified my code from above like this...

fetch(`http://swapi.co/api/people/1/`)
  .then(res => res.json())
  .then(res => {
      if (callback) {
        callback(res);    // Client receives the response as desired type.  
      }
  });

So that a client can call it with a callback like...

(response: IApigeeResponse) => {
    // Process response as an IApigeeResponse
}

What is the GAC in .NET?

GAC (Global Assembly Cache) is where all shared .NET assembly reside.

How to handle invalid SSL certificates with Apache HttpClient?

For Apache HttpClient 4.5+ & Java8:

SSLContext sslContext = SSLContexts.custom()
        .loadTrustMaterial((chain, authType) -> true).build();

SSLConnectionSocketFactory sslConnectionSocketFactory =
        new SSLConnectionSocketFactory(sslContext, new String[]
        {"SSLv2Hello", "SSLv3", "TLSv1","TLSv1.1", "TLSv1.2" }, null,
        NoopHostnameVerifier.INSTANCE);
CloseableHttpClient client = HttpClients.custom()
        .setSSLSocketFactory(sslConnectionSocketFactory)
        .build();

But if your HttpClient use a ConnectionManager for seeking connection, e.g. like this:

 PoolingHttpClientConnectionManager connectionManager = new 
         PoolingHttpClientConnectionManager();

 CloseableHttpClient client = HttpClients.custom()
            .setConnectionManager(connectionManager)
            .build();

The HttpClients.custom().setSSLSocketFactory(sslConnectionSocketFactory) has no effect, the problem is not resolved.

Because that the HttpClient use the specified connectionManager for seeking connection and the specified connectionManager haven't register our customized SSLConnectionSocketFactory. To resolve this, should register the The customized SSLConnectionSocketFactory in the connectionManager. The correct code should like this:

PoolingHttpClientConnectionManager connectionManager = new 
    PoolingHttpClientConnectionManager(RegistryBuilder.
                <ConnectionSocketFactory>create()
      .register("http",PlainConnectionSocketFactory.getSocketFactory())
      .register("https", sslConnectionSocketFactory).build());

CloseableHttpClient client = HttpClients.custom()
            .setConnectionManager(connectionManager)
            .build();

C# - Making a Process.Start wait until the process has start-up

Are you sure the Start method returns before the child process starts? I was always under the impression that Start starts the child process synchronously.

If you want to wait until your child process finishes some sort of initialization then you need inter-process communication - see Interprocess communication for Windows in C# (.NET 2.0).

Why is Dictionary preferred over Hashtable in C#?

Because Dictionary is a generic class ( Dictionary<TKey, TValue> ), so that accessing its content is type-safe (i.e. you do not need to cast from Object, as you do with a Hashtable).

Compare

var customers = new Dictionary<string, Customer>();
...
Customer customer = customers["Ali G"];

var customers = new Hashtable();
...
Customer customer = customers["Ali G"] as Customer;

However, Dictionary is implemented as hash table internally, so technically it works the same way.

What is an AssertionError? In which case should I throw it from my own code?

AssertionError is an Unchecked Exception which rises explicitly by programmer or by API Developer to indicate that assert statement fails.

assert(x>10);

Output:

AssertionError

If x is not greater than 10 then you will get runtime exception saying AssertionError.

Array Size (Length) in C#

for 1 dimensional array

int[] listItems = new int[] {2,4,8};
int length = listItems.Length;

for multidimensional array

int length = listItems.Rank;

To get the size of 1 dimension

int length =  listItems.GetLength(0);

window.close and self.close do not close the window in Chrome

If you can't close windows that aren't opened by the script, then you can destroy your page using this code:

 document.getElementsByTagName ('html') [0] .remove ();

Is there a command like "watch" or "inotifywait" on the Mac?

Here's a simple single line alternative for users who don't have the watch command who want to execute a command every 3 seconds:

while :; do your-command; sleep 3; done

It's an infinite loop that is basically the same as doing the following:

watch -n3 your-command

How to refactor Node.js code that uses fs.readFileSync() into using fs.readFile()?

This variant is better because you could not know whether file exists or not. You should send correct header when you know for certain that you can read contents of your file. Also, if you have branches of code that does not finish with '.end()', browser will wait until it get them. In other words, your browser will wait a long time.

var fs = require("fs");
var filename = "./index.html";

function start(resp) {

    fs.readFile(filename, "utf8", function(err, data) {
        if (err) {
            // may be filename does not exists?
            resp.writeHead(404, {
                'Content-Type' : 'text/html'
            });
            // log this error into browser
            resp.write(err.toString());
            resp.end();
        } else {

            resp.writeHead(200, {
                "Content-Type": "text/html"
            });      
            resp.write(data.toString());
            resp.end();
        }
    });
}

EXCEL VBA, inserting blank row and shifting cells

Sub Addrisk()

Dim rActive As Range
Dim Count_Id_Column as long

Set rActive = ActiveCell

Application.ScreenUpdating = False

with thisworkbook.sheets(1) 'change to "sheetname" or sheetindex
    for i = 1 to .range("A1045783").end(xlup).row
        if 'something'  = 'something' then
            .range("A" & i).EntireRow.Copy 'add thisworkbook.sheets(index_of_sheet) if you copy from another sheet
            .range("A" & i).entirerow.insert shift:= xldown 'insert and shift down, can also use xlup
            .range("A" & i + 1).EntireRow.paste 'paste is all, all other defs are less.
            'change I to move on to next row (will get + 1 end of iteration)
            i = i + 1
        end if

            On Error Resume Next
                .SpecialCells(xlCellTypeConstants).ClearContents
            On Error GoTo 0

        End With
    next i
End With

Application.CutCopyMode = False
Application.ScreenUpdating = True 're-enable screen updates

End Sub

Java system properties and environment variables

I think the difference between the two boils down to access. Environment variables are accessible by any process and Java system properties are only accessible by the process they are added to.

Also as Bohemian stated, env variables are set in the OS (however they 'can' be set through Java) and system properties are passed as command line options or set via setProperty().

How to change plot background color?

If you already have axes object, just like in Nick T's answer, you can also use

 ax.patch.set_facecolor('black')

A long bigger than Long.MAX_VALUE

If triangle.lborderA is indeed a long then the test in the original code is trivially true, and there is no way to test it. It is also useless.

However, if triangle.lborderA is a double, the comparison is useful and can be tested. isBiggerThanMaxLong(1e300) does return true.

  public static boolean isBiggerThanMaxLong(double in){
    return in > Long.MAX_VALUE;
  }

Xcode error: Code signing is required for product type 'Application' in SDK 'iOS 10.0'

To add developer account to Xcode:

Press Cmd ? + , (comma)
Go to Accounts tab
Follow the screen shot below to enable development team:

Replace all 0 values to NA

Let me assume that your data.frame is a mix of different datatypes and not all columns need to be modified.

to modify only columns 12 to 18 (of the total 21), just do this

df[, 12:18][df[, 12:18] == 0] <- NA

Android Fragment no view found for ID?

In my case I had a SupportMapFragment in a recycler view item (I was using the lower overhead "liteMode" which makes the map appear as non-interactive, almost like a static image). I was using the correct FragmentManager, and everything appeared to work fine... with a small list. Once the list of items exceeded the screen height by a bit then I started getting this issue when scrolling.

Turned out, it was because I was injecting a dynamic SupportMapFragment inside a view, which was inside another fragment, to get around some issues I was having when trying to declare it statically in my XML. Because of this, the fragment placeholder layout could only be replaced with the actual fragment once the view was attached to the window, i.e. visible on screen. So I had put my code for initialising the SupportMapFragment, doing the Fragment replace, and calling getMapAsync() in the onAttachedToWindow event.

What I forgot to do was ensure that my code didn't run twice. I.e. in onAttachedToWindow event, check if my dynamic SupportMapFragment was still null before trying to create a new instance of it and do a Fragment replace. When the item goes off the top of the RecyclerView, it is detached from the window, then reattached when you scroll back to it, so this event is fired multiple times.

Once I added the null check, it happened only once per RecyclerView item and issue went away! TL;DR!

Javascript regular expression password validation having special characters

If you check the length seperately, you can do the following:

var regularExpression  = /^[a-zA-Z]$/;

if (regularExpression.test(newPassword)) {
    alert("password should contain atleast one number and one special character");
    return false;
}

Force an Android activity to always use landscape mode

Doing it in code is is IMO wrong and even more so if you put it into the onCreate. Do it in the manifest and the "system" knows the orientation from the startup of the app. And this type of meta or top level "guidance" SHOULD be in the manifest. If you want to prove it to yourself set a break in the Activity's onCreate. If you do it in code there it will be called twice : it starts up in Portrait mode then is switched to Landscape. This does not happen if you do it in the manifest.

Convert .cer certificate to .jks

keytool comes with the JDK installation (in the bin folder):

keytool -importcert -file "your.cer" -keystore your.jks -alias "<anything>"

This will create a new keystore and add just your certificate to it.

So, you can't convert a certificate to a keystore: you add a certificate to a keystore.

How do I serialize a Python dictionary into a string, and then back to a dictionary?

pyyaml should also be mentioned here. It is both human readable and can serialize any python object.
pyyaml is hosted here:
https://bitbucket.org/xi/pyyaml

How to write the Fibonacci Sequence?

Fibonacci sequence is: 1, 1, 2, 3, 5, 8, ....

That is f(1) = 1, f(2) = 1, f(3) = 2, ..., f(n) = f(n-1) + f(n-2).

My favorite implementation (simplest and yet achieves a light speed in compare to other implementations) is this:

def fibonacci(n):
    a, b = 0, 1
    for _ in range(1, n):
        a, b = b, a + b
    return b

Test

>>> [fibonacci(i) for i in range(1, 10)]
[1, 1, 2, 3, 5, 8, 13, 21, 34]

Timing

>>> %%time
>>> fibonacci(100**3)
CPU times: user 9.65 s, sys: 9.44 ms, total: 9.66 s
Wall time: 9.66 s

Edit: an example visualization for this implementations.

AngularJS : ng-click not working

It just happend to me. I solved the problem by tracing backward from the point ng-click is coded. Found out that an extra

</div>

was placed in the html to prematurely close the div block that contains the ng-click.

Removed the extra

</div>

then everything is working fine.

Share application "link" in Android

You can use also ShareCompat class from support library.

ShareCompat.IntentBuilder.from(activity)
    .setType("text/plain")
    .setChooserTitle("Chooser title")
    .setText("http://play.google.com/store/apps/details?id=" + activity.getPackageName())
    .startChooser();

https://developer.android.com/reference/android/support/v4/app/ShareCompat.html

Can Windows Containers be hosted on linux?

Update3: 06.2019 Some of the comments says that the answer is not clear, I'll try to clarify.

TL;DR:

Q: Can Windows containers run on Linux?

A: No. They cannot. Containers are using the underlying Operating System resources and drivers, so Windows containers can run on Windows only, and Linux containers can run on Linux only.

Q: But what about Docker for Windows? Or other VM-based solutions?

A: Docker for Windows allows you to simulate running Linux containers on Windows, but under the hood a Linux VM is created, so still Linux containers are running on Linux, and Windows containers are running on Windows.

Bonus: Read this very nice article about running Linux docker containers on Windows.

Q: So, what should I do with a .Net Framework 462 app, if I would like to run in a container?

A: It depends. Following several recommendations:

If it is possible - move to .Net Core. Since .Net Core brings support to most major features of .Net Framework, and .Net Framework 4.8 will be the last version of .Net framework
If you cannot migrate to .Net Core - As @Sebastian mentioned - you can convert your libraries to .Net Standard, and have 2 versions of app - one on .Net Framework 4.6.2, and one on .Net Core - it is not always obvious, Visual Studio supports it pretty well (with multi-targeting), but some dependencies can require extra care.
(Less recommended) In some cases, you can run windows containers. Windows containers are becoming more and more mature, with better support in platforms like Kubernetes. But to be able to run .Net Framework code, you still need to run on base image of "Server Core", which occupies about 1.4 GB. In same rare cases, you can migrate your code to .Net Core, but still run on Windows Nano servers, with an image size of 95 MB.

Leaving also the old updates for history

Update2: 08.2018 If you are using Docker-for-Windows, you can run now both windows and linux containers simultaneously: https://blogs.msdn.microsoft.com/premier_developer/2018/04/20/running-docker-windows-and-linux-containers-simultaneously/

Bonus: Not directly related to the question, but you can now run not only the linux container itself, but also orchestrator like kubernetes: https://blog.docker.com/2018/07/kubernetes-is-now-available-in-docker-desktop-stable-channel/

Updated at 2018:

Original answer in general is right, BUT several months ago, docker added experimental feature LCOW (official github repository).

From this post:

Doesn’t Docker for Windows already run Linux containers? That’s right. Docker for Windows can run Linux or Windows containers, with support for Linux containers via a Hyper-V Moby Linux VM (as of Docker for Windows 17.10 this VM is based on LinuxKit).

The setup for running Linux containers with LCOW is a lot simpler than the previous architecture where a Hyper-V Linux VM runs a Linux Docker daemon, along with all your containers. With LCOW, the Docker daemon runs as a Windows process (same as when running Docker Windows containers), and every time you start a Linux container Docker launches a minimal Hyper-V hypervisor running a VM with a Linux kernel, runc and the container processes running on top.

Because there’s only one Docker daemon, and because that daemon now runs on Windows, it will soon be possible to run Windows and Linux Docker containers side-by-side, in the same networking namespace. This will unlock a lot of exciting development and production scenarios for Docker users on Windows.

Original:

As mentioned in comments by @PanagiotisKanavos, containers are not for virtualization, and they are using the resources of the host machine. As a result, for now windows container cannot run "as-is" on linux machine.

But - you can do it by using VM - as it works on windows. You can install windows VM on your linux host, which will allow to run windows containers.

With it, IMHO run it this way on PROD environment will not be the best idea.

Also, this answer provides more details.

Enum String Name from Value

you can just cast it

int dbValue = 2;
EnumDisplayStatus enumValue = (EnumDisplayStatus)dbValue;
string stringName = enumValue.ToString(); //Visible

ah.. kent beat me to it :)

How to parse a query string into a NameValueCollection in .NET

This is my code, I think it's very useful:

public String GetQueryString(string ItemToRemoveOrInsert = null, string InsertValue = null )
{
    System.Collections.Specialized.NameValueCollection filtered = new System.Collections.Specialized.NameValueCollection(Request.QueryString);
    if (ItemToRemoveOrInsert != null)
    {
        filtered.Remove(ItemToRemoveOrInsert);
        if (!string.IsNullOrWhiteSpace(InsertValue))
        {
            filtered.Add(ItemToRemoveOrInsert, InsertValue);
        }
    }

    string StrQr = string.Join("&", filtered.AllKeys.Select(key => key + "=" + filtered[key]).ToArray());
    if (!string.IsNullOrWhiteSpace(StrQr)){
        StrQr="?" + StrQr;
    }

    return StrQr;
}

How to use regex with find command?

Try to use single quotes (') to avoid shell escaping of your string. Remember that the expression needs to match the whole path, i.e. needs to look like:

 find . -regex '\./[a-f0-9-]*.jpg'

Apart from that, it seems that my find (GNU 4.4.2) only knows basic regular expressions, especially not the {36} syntax. I think you'll have to make do without it.

Add CSS or JavaScript files to layout head from views or partial views

Sadly, this is not possible by default to use section as another user suggested, since a section is only available to the immediate child of a View.

What works however is implementing and redefining the section in every view, meaning:

section Head
{
    @RenderSection("Head", false)
}

This way every view can implement a head section, not just the immediate children. This only works partly though, especially with multiple partials the troubles begin (as you have mentioned in your question).

So the only real solution to your problem is using the ViewBag. The best would probably be a seperate collection (list) for CSS and scripts. For this to work, you need to ensure that the List used is initialized before any of the views are executed. Then you can can do things like this in the top of every view/partial (without caring if the Scripts or Styles value is null:

ViewBag.Scripts.Add("myscript.js");
ViewBag.Styles.Add("mystyle.css");

In the layout you can then loop through the collections and add the styles based on the values in the List.

@foreach (var script in ViewBag.Scripts)
{
    <script type="text/javascript" src="@script"></script>
}
@foreach (var style in ViewBag.Styles)
{
    <link href="@style" rel="stylesheet" type="text/css" />
}

I think it's ugly, but it's the only thing that works.

******UPDATE**** Since it starts executing the inner views first and working its way out to the layout and CSS styles are cascading, it would probably make sense to reverse the style list via ViewBag.Styles.Reverse().

This way the most outer style is added first, which is inline with how CSS style sheets work anyway.

jQuery, get html of a whole element

You can achieve that with just one line code that simplify that:

$('#divs').get(0).outerHTML;

As simple as that.

see if two files have the same content in python

I'm not sure if you want to find duplicate files or just compare two single files. If the latter, the above approach (filecmp) is better, if the former, the following approach is better.

There are lots of duplicate files detection questions here. Assuming they are not very small and that performance is important, you can

Compare file sizes first, discarding all which doesn't match
If file sizes match, compare using the biggest hash you can handle, hashing chunks of files to avoid reading the whole big file

Here's is an answer with Python implementations (I prefer the one by nosklo, BTW)

What's the difference between a method and a function?

Simple way to remember:

Function ? Free (Free means not belong to an object or class)
Method ? Member (A member of an object or class)

How do I get this javascript to run every second?

Use setInterval(func, delay) to run the func every delay milliseconds.

setTimeout() runs your function once after delay milliseconds -- it does not run it repeatedly. A common strategy is to run your code with setTimeout and call setTimeout again at the end of your code.

Else clause on Python while statement

The else-clause is executed when the while-condition evaluates to false.

From the documentation:

The while statement is used for repeated execution as long as an expression is true:
while_stmt ::=  "while" expression ":" suite
                ["else" ":" suite]
This repeatedly tests the expression and, if it is true, executes the first suite; if the expression is false (which may be the first time it is tested) the suite of the else clause, if present, is executed and the loop terminates.

A break statement executed in the first suite terminates the loop without executing the else clause’s suite. A continue statement executed in the first suite skips the rest of the suite and goes back to testing the expression.

Fetch: POST json data

It might be useful to somebody:

I was having the issue that formdata was not being sent for my request

In my case it was a combination of following headers that were also causing the issue and the wrong Content-Type.

So I was sending these two headers with the request and it wasn't sending the formdata when I removed the headers that worked.

"X-Prototype-Version" : "1.6.1",
"X-Requested-With" : "XMLHttpRequest"

Also as other answers suggest that the Content-Type header needs to be correct.

For my request the correct Content-Type header was:

"Content-Type": "application/x-www-form-urlencoded; charset=UTF-8"

So bottom line if your formdata is not being attached to the Request then it could potentially be your headers. Try bringing your headers to a minimum and then try adding them one by one to see if your problem is rsolved.

PHP: Best way to check if input is a valid number?

return ctype_digit($num) && (int) $num > 0

CodeIgniter activerecord, retrieve last insert id?

$this->db->insert_id();

Try this As your desired question.

How to fix corrupted git repository?

In my case, I was creating the repository from source code already in my pc and that error appeared. I deleted the .git folder and did everything again and it worked :)

Run a script in Dockerfile

In addition to the answers above:

If you created/edited your .sh script file in Windows, make sure it was saved with line ending in Unix format. By default many editors in Windows will convert Unix line endings to Windows format and Linux will not recognize shebang (#!/bin/sh) at the beginning of the file. So Linux will produce the error message like if there is no shebang.

Tips:

If you use Notepad++, you need to click "Edit/EOL Conversion/UNIX (LF)"
If you use Visual Studio, I would suggest installing "End Of Line" plugin. Then you can make line endings visible by pressing Ctrl-R, Ctrl-W. And to set Linux style endings you can press Ctrl-R, Ctrl-L. For Windows style, press Ctrl-R, Ctrl-C.

Break a previous commit into multiple commits

If you have this:

A - B <- mybranch

Where you have committed some content in commit B:

/modules/a/file1
/modules/a/file2
/modules/b/file3
/modules/b/file4

But you want to split B into C - D, and get this result:

A - C - D <-mybranch

You can divide the content like this for example (content from different directories in different commits)...

Reset the branch back to the commit before the one to split:

git checkout mybranch
git reset --hard A

Create first commit (C):

git checkout B /modules/a
git add -u
git commit -m "content of /modules/a"

Create second commit (D):

git checkout B /modules/b
git add -u
git commit -m "content of /modules/b"

How to make a query with group_concat in sql server

Please run the below query, it doesn't requires STUFF and GROUP BY in your case:

Select
      A.maskid
    , A.maskname
    , A.schoolid
    , B.schoolname
    , CAST((
          SELECT  T.maskdetail+','
          FROM dbo.maskdetails T
          WHERE A.maskid = T.maskid
          FOR XML PATH(''))as varchar(max)) as maskdetail 
FROM dbo.tblmask A
JOIN dbo.school B ON B.ID = A.schoolid

HTML5 Video not working in IE 11

It was due to IE Document-mode version too low. Press 'F12' and using higher version( My case, above version 9 is OK)

An App ID with Identifier '' is not available. Please enter a different string

None of the above answers helped me, but I just found the solution.

For those who couldn't benefit from any of the above answers;

The issue was that I tried to build project with another Team.

I have 2 different teams as you see

I noticed that I did debug before with second team and xCode automatically created an App ID in second team's developer account.

I opened https://developer.apple.com/ for second account and removed auto-created APP ID

Then worked fine

How/when to generate Gradle wrapper files?

This is the command to use to tell Gradle to upgrade the wrapper such that it will grab the distribution versions of libraries that includes source code:

./gradlew wrapper --gradle-version <version> --distribution-type all

Specifying the distribution-type with "all" will make sure Gradle downloads source files for use by your development environment.

Pros:

IDEs will have immediate access to source code. For example, Intellij IDEA won't prompt you to update your build scripts to include the source distro (because this command already did that)

Cons:

Longer/Bigger build process because it's downloading source code. This is a waste of time/space on a build or CI server where the source code is not necessary.

Please comment or provide another answer if you know of any command line option to tell Gradle not to download sources on a build server.

How to tell which row number is clicked in a table?

This would get you the index of the clicked row, starting with one:

_x000D_

$('#thetable').find('tr').click( function(){_x000D_
alert('You clicked row '+ ($(this).index()+1) );_x000D_
});

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<table id="thetable">_x000D_
   <tr>_x000D_
      <td>1</td><td>1</td><td>1</td>_x000D_
   </tr>_x000D_
   <tr>_x000D_
      <td>2</td><td>2</td><td>2</td>_x000D_
   </tr>_x000D_
   <tr>_x000D_
      <td>3</td><td>3</td><td>3</td>_x000D_
   </tr>_x000D_
</table>

_x000D_

If you want to return the number stored in that first cell of each row:

$('#thetable').find('tr').click( function(){
  var row = $(this).find('td:first').text();
  alert('You clicked ' + row);
});

How to uncheck checkbox using jQuery Uniform library

_x000D_

 $("#checkall").change(function () {_x000D_
            var checked = $(this).is(':checked');_x000D_
            if (checked) {_x000D_
                $(".custom-checkbox").each(function () {_x000D_
                    $(this).prop("checked", true).uniform();_x000D_
                });_x000D_
            } else {_x000D_
                $(".custom-checkbox").each(function () {_x000D_
                    $(this).prop("checked", false).uniform();_x000D_
                });_x000D_
            }_x000D_
        });_x000D_
_x000D_
        // Changing state of CheckAll custom-checkbox_x000D_
        $(".custom-checkbox").click(function () {_x000D_
            if ($(".custom-checkbox").length == $(".custom-checkbox:checked").length) {_x000D_
                $("#chk-all").prop("checked", true).uniform();_x000D_
            } else {_x000D_
                $("#chk-all").removeAttr("checked").uniform();_x000D_
            }_x000D_
        });

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<input type="checkbox" id='checkall' /> Select All<br/>_x000D_
 <input type="checkbox" class='custom-checkbox' name="languages" value="PHP"> PHP<br/>_x000D_
 <input type="checkbox" class='custom-checkbox' name="languages" value="AngularJS"> AngularJS<br/>_x000D_
 <input type="checkbox" class='custom-checkbox' name="languages" value="Python"> Python<br/>_x000D_
 <input type="checkbox" class='custom-checkbox' name="languages" value="Java"> Java<br/>

_x000D_

How do I create a file AND any folders, if the folders don't exist?

You will need to check both parts of the path (directory and filename) and create each if it does not exist.

Use File.Exists and Directory.Exists to find out whether they exist. Directory.CreateDirectory will create the whole path for you, so you only ever need to call that once if the directory does not exist, then simply create the file.

Selecting element by data attribute with jQuery

For this to work in Chrome the value must not have another pair of quotes.

It only works, for example, like this:

$('a[data-customerID=22]');

Adding a css class to select using @Html.DropDownList()

Try this:

@Html.DropDownList(
    "country", 
    new[] {
        new SelectListItem() { Value = "IN", Text = "India" },
        new SelectListItem() { Value = "US", Text = "United States" }
    }, 
    "Country",
    new { @class = "form-control",@selected = Model.Country}
)

How to create dictionary and add key–value pairs dynamically?

First Initialise Array Globally

var dict = []

Add Object into Dictionary

dict.push(
     { key: "One",value: false},
     { key: "Two",value: false},
     { key: "Three",value: false});

Output : 
   [0: {key: "One", value: false}
    1: {key: "Two", value: false}
    2: {key: "Three", value: false}]

Update Object from Dictionary

Object.keys(dict).map((index) => {        
  if (index == 1){
    dict[index].value = true
  }
});

Output : 
   [0: {key: "One", value: false},
    1: {key: "Two", value: true},
    2: {key: "Three", value: false}]

Delete Object from Dictionary

Object.keys(dict).map((index) => {              
      if (index == 2){
        dict.splice(index)
      }
    });

Output : 
    [0: {key: "One", value: false},
     1: {key: "Two", value: true}]

Querying Windows Active Directory server using ldapsearch from command line

The short answer is "yes". A sample ldapsearch command to query an Active Directory server is:

ldapsearch \
    -x -h ldapserver.mydomain.com \
    -D "[email protected]" \
    -W \
    -b "cn=users,dc=mydomain,dc=com" \
    -s sub "(cn=*)" cn mail sn

This would connect to an AD server at hostname ldapserver.mydomain.com as user [email protected], prompt for the password on the command line and show name and email details for users in the cn=users,dc=mydomain,dc=com subtree.

See Managing LDAP from the Command Line on Linux for more samples. See LDAP Query Basics for Microsoft Exchange documentation for samples using LDAP queries with Active Directory.

How to access a dictionary key value present inside a list?

First of all don't use 'list' as variable name.

If you have simple dictionaries with unique keys then you can do the following(note that new dictionary object with all items from sub-dictionaries will be created):

res  = {}
for line in listOfDicts:
   res.update(line)
res['d']
>>> 4

Otherwise:

getValues = lambda key,inputData: [subVal[key] for subVal in inputData if key in subVal]
getValues('d', listOfDicts)
>>> [4]

Or very base:

def get_value(listOfDicts, key):
    for subVal in listOfDicts:
        if key in subVal:
            return subVal[key]

AngularJS ng-if with multiple conditions

OR operator:

<div ng-repeat="k in items">
    <div ng-if="k || 'a' or k == 'b'">
        <!-- SOME CONTENT -->
    </div>
</div>

Even though it is simple enough to read, I hope as a developer you are use better names than 'a' 'k' 'b' etc..

For Example:

<div class="links-group" ng-repeat="group in groups" ng-show="!group.hidden">
    <li ng-if="user.groups.admin || group.title == 'Home Pages'"> 
        <!--Content-->
    </li>
</div>

Another OR example

<p ng-if="group.title != 'Dispatcher News' or group.title != 'Coordinator News'" style="padding: 5px;">No links in group.</p>

AND operator (For those stumbling across this stackoverflow answer looking for an AND instead of OR condition)

<div class="links-group" ng-repeat="group in groups" ng-show="!group.hidden">
    <li ng-if="user.groups.admin && group.title == 'Home Pages'"> 
        <!--Content-->
    </li>
</div>

How to resolve ORA 00936 Missing Expression Error?

Remove the comma?

select /*+USE_HASH( a b ) */ to_char(date, 'MM/DD/YYYY HH24:MI:SS') as LABEL,
ltrim(rtrim(substr(oled, 9, 16))) as VALUE
from rrfh a, rrf b
where ltrim(rtrim(substr(oled, 1, 9))) = 'stata kish' 
and a.xyz = b.xyz

Have a look at FROM

SELECTING from multiple tables You can include multiple tables in the FROM clause by listing the tables with a comma in between each table name

Disable submit button on form submit

How to disable submit button

just call a function on onclick event and... return true to submit and false to disable submit. OR call a function on window.onload like :

window.onload = init();

and in init() do something like this :

var theForm = document.getElementById(‘theForm’);
theForm.onsubmit =  // what ever you want to do

Sorting hashmap based on keys

Use sorted TreeMap:

Map<String, Float> map = new TreeMap<>(yourMap);

It will automatically put entries sorted by keys. I think natural String ordering will be fine in your case.

Note that HashMap due to lookup optimizations does not preserve order.

Does VBScript have a substring() function?

As Tmdean correctly pointed out you can use the Mid() function. The MSDN Library also has a great reference section on VBScript which you can find here:

VBScript Language Reference (MSDN Library)

Full-screen iframe with a height of 100%

This worked very nicely for me (only if iframe content comes from the same domain):

<script type="text/javascript">
function calcHeight(iframeElement){
    var the_height=  iframeElement.contentWindow.document.body.scrollHeight;
    iframeElement.height=  the_height;
}
</script>
<iframe src="./page.html" onLoad="calcHeight(this);" frameborder="0" scrolling="no" id="the_iframe" width="100%" ></iframe>

How to import component into another root component in Angular 2

You should declare it with declarations array(meta property) of @NgModule as shown below (RC5 and later),

import {CoursesComponent} from './courses.component';

@NgModule({
  imports:      [ BrowserModule],
  declarations: [ AppComponent,CoursesComponent],  //<----here
  providers:    [],      
  bootstrap:    [ AppComponent ]
})

Submitting the value of a disabled input field

Input elements have a property called disabled. When the form submits, just run some code like this:

var myInput = document.getElementById('myInput');
myInput.disabled = true;

How to show math equations in general github's markdown(not github's blog)

Regarding tex?image conversion, the tool LaTeXiT produces much higher quality output. I believe it is standard in most TeX distributions but you can certainly find it online if you don't already have it. All you need to do is put it in the TeX, drag the image to your desktop, then drag from your desktop to an image hosting site (I use imgur).

Difference between JPanel, JFrame, JComponent, and JApplet

JFrame and JApplet are top level containers. If you wish to create a desktop application, you will use JFrame and if you plan to host your application in browser you will use JApplet.

JComponent is an abstract class for all Swing components and you can use it as the base class for your new component. JPanel is a simple usable component you can use for almost anything.

Since this is for a fun project, the simplest way for you is to work with JPanel and then host it inside JFrame or JApplet. Netbeans has a visual designer for Swing with simple examples.

python request with authentication (access_token)

The requests package has a very nice API for HTTP requests, adding a custom header works like this (source: official docs):

>>> import requests
>>> response = requests.get(
... 'https://website.com/id', headers={'Authorization': 'access_token myToken'})

If you don't want to use an external dependency, the same thing using urllib2 of the standard library looks like this (source: the missing manual):

>>> import urllib2
>>> response = urllib2.urlopen(
... urllib2.Request('https://website.com/id', headers={'Authorization': 'access_token myToken'})

How to overlay image with color in CSS?

Use mutple backgorund on the element, and use a linear-gradient as your color overlay by declaring both start and end color-stops as the same value.

Note that layers in a multi-background declaration are read much like they are rendered, top-to-bottom, so put your overlay first, then your bg image:

#header {
  background: 
    linear-gradient(to bottom, rgba(100, 100, 0, 0.5), rgba(100, 100, 0, 0.5)) cover,
    url(../img/bg.jpg) 0 0 no-repeat fixed;
  height: 100%;
  overflow: hidden;
  color: #FFFFFF
}

Save array in mysql database

You can store the array using serialize/unserialize. With that solution they cannot easily be used from other programming languages, so you may consider using json_encode/json_decode instead (which gives you a widely supported format). Avoid using implode/explode for this since you'll probably end up with bugs or security flaws.

Note that this makes your table non-normalized, which may be a bad idea since you cannot easily query the data. Therefore consider this carefully before going forward. May you need to query the data for statistics or otherwise? Are there other reasons to normalize the data?

Also, don't save the raw $_POST array. Someone can easily make their own web form and post data to your site, thereby sending a really large form which takes up lots of space. Save those fields you want and make sure to validate the data before saving it (so you won't get invalid values).

How can I declare and define multiple variables in one line using C++?

As others have mentioned, from C++17 onwards you can make use of structured bindings for multiple variable assignments.

Combining this with std::array and template argument deduction we can write a function that assigns a value to an arbitrary number of variables without repeating the type or value.

#include <iostream>
#include <array>

template <int N, typename T> auto assign(T value)
{
    std::array<T, N> out;
    out.fill(value);
    return out;
}

int main()
{
    auto [a, b, c] = assign<3>(1);

    for (const auto& v : {a, b, c})
    {
        std::cout << v << std::endl;
    }

    return 0;
}

Demo

Wireshark vs Firebug vs Fiddler - pros and cons?

I use both Charles Proxy and Fiddler for my HTTP/HTTPS level debugging.

Pros of Charles Proxy:

Handles HTTPS better (you get a Charles Certificate which you'd put in 'Trusted Authorities' list)
Has more features like Load/Save Session (esp. useful when debugging multiple pages), Mirror a website (useful in caching assets and hence faster debugging), etc.
As mentioned by jburgess, handles AMF.
Displays JSON, XML and other kind of responses in a tree structure, making it easier to read. Displays images in image responses instead of binary data.

Cons of Charles Proxy:

Cost :-)

"element.dispatchEvent is not a function" js error caught in firebug of FF3.0

You have to add

<script>jQuery.noConflict();</script>

after

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>

How do you generate dynamic (parameterized) unit tests in Python?

The metaclass-based answers still work in Python 3, but instead of the __metaclass__ attribute, one has to use the metaclass parameter, as in:

class ExampleTestCase(TestCase,metaclass=DocTestMeta):
    pass

How to redirect to Index from another controller?

Complete answer (.Net Core 3.1)

Most answers here are correct but taken a bit out of context, so I will provide a full-fledged answer which works for Asp.Net Core 3.1. For completeness' sake:

[Route("health")]
[ApiController]
public class HealthController : Controller
{
    [HttpGet("some_health_url")]
    public ActionResult SomeHealthMethod() {}
}

[Route("v2")]
[ApiController]
public class V2Controller : Controller
{
    [HttpGet("some_url")]
    public ActionResult SomeV2Method()
    {
        return RedirectToAction("SomeHealthMethod", "Health"); // omit "Controller"
    }
}

If you try to use any of the url-specific strings, e.g. "some_health_url", it will not work!

How to copy commits from one branch to another?

The cherry-pick command can read the list of commits from the standard input.

The following command cherry-picks commits authored by the user John that exist in the "develop" branch but not in the "release" branch, and does so in the chronological order.

git log develop --not release --format=%H --reverse --author John | git cherry-pick --stdin

How to duplicate a whole line in Vim?

You can also try <C-x><C-l> which will repeat the last line from insert mode and brings you a completion window with all of the lines. It works almost like <C-p>

How do I set/unset a cookie with jQuery?

You can use a plugin available here..

https://plugins.jquery.com/cookie/

and then to write a cookie do $.cookie("test", 1);

to access the set cookie do $.cookie("test");

How do I put variables inside javascript strings?

Here is a Multi-line String Literal example in Node.js.

> let name = 'Fred'
> tm = `Dear ${name},
... This is to inform you, ${name}, that you are
... IN VIOLATION of Penal Code 64.302-4.
... Surrender yourself IMMEDIATELY!
... THIS MEANS YOU, ${name}!!!
...
... `
'Dear Fred,\nThis is to inform you, Fred, that you are\nIN VIOLATION of Penal Code 64.302-4.\nSurrender yourself IMMEDIATELY!\nTHIS MEANS YOU, Fred!!!\n\n'
console.log(tm)
Dear Fred,
This is to inform you, Fred, that you are
IN VIOLATION of Penal Code 64.302-4.
Surrender yourself IMMEDIATELY!
THIS MEANS YOU, Fred!!!


undefined
>

Posting parameters to a url using the POST method without using a form

You could use JavaScript and XMLHTTPRequest (AJAX) to perform a POST without using a form. Check this link out. Keep in mind that you will need JavaScript enabled in your browser though.

convert from Color to brush

I had same issue before, here is my class which solved color conversions Use it and enjoy :

Here U go, Use my Class to Multi Color Conversion

using System;
using System.Windows.Media;
using SDColor = System.Drawing.Color;
using SWMColor = System.Windows.Media.Color;
using SWMBrush = System.Windows.Media.Brush;

//Developed by ???? ????? ?????
namespace APREndUser.CodeAssist
{
    public static class ColorHelper
    {
        public static SWMColor ToSWMColor(SDColor color) => SWMColor.FromArgb(color.A, color.R, color.G, color.B);
        public static SDColor ToSDColor(SWMColor color) => SDColor.FromArgb(color.A, color.R, color.G, color.B);
        public static SWMBrush ToSWMBrush(SDColor color) => (SolidColorBrush)(new BrushConverter().ConvertFrom(ToHexColor(color)));
        public static string ToHexColor(SDColor c) => "#" + c.R.ToString("X2") + c.G.ToString("X2") + c.B.ToString("X2");
        public static string ToRGBColor(SDColor c) => "RGB(" + c.R.ToString() + "," + c.G.ToString() + "," + c.B.ToString() + ")";
        public static Tuple<SDColor, SDColor> GetColorFromRYGGradient(double percentage)
        {
            var red = (percentage > 50 ? 1 - 2 * (percentage - 50) / 100.0 : 1.0) * 255;
            var green = (percentage > 50 ? 1.0 : 2 * percentage / 100.0) * 255;
            var blue = 0.0;
            SDColor result1 = SDColor.FromArgb((int)red, (int)green, (int)blue);
            SDColor result2 = SDColor.FromArgb((int)green, (int)red, (int)blue);
            return new Tuple<SDColor, SDColor>(result1, result2);
        }
    }

}

Assignment inside lambda expression in Python

No, you cannot put an assignment inside a lambda because of its own definition. If you work using functional programming, then you must assume that your values are not mutable.

One solution would be the following code:

output = lambda l, name: [] if l==[] \
             else [ l[ 0 ] ] + output( l[1:], name ) if l[ 0 ].name == name \
             else output( l[1:], name ) if l[ 0 ].name == "" \
             else [ l[ 0 ] ] + output( l[1:], name )

How to write "Html.BeginForm" in Razor

The following code works fine:

@using (Html.BeginForm("Upload", "Upload", FormMethod.Post, 
                                      new { enctype = "multipart/form-data" }))
{
    @Html.ValidationSummary(true)
    <fieldset>
        Select a file <input type="file" name="file" />
        <input type="submit" value="Upload" />
    </fieldset>
}

and generates as expected:

<form action="/Upload/Upload" enctype="multipart/form-data" method="post">    
    <fieldset>
        Select a file <input type="file" name="file" />
        <input type="submit" value="Upload" />
    </fieldset>
</form>

On the other hand if you are writing this code inside the context of other server side construct such as an if or foreach you should remove the @ before the using. For example:

@if (SomeCondition)
{
    using (Html.BeginForm("Upload", "Upload", FormMethod.Post, 
                                      new { enctype = "multipart/form-data" }))
    {
        @Html.ValidationSummary(true)
        <fieldset>
            Select a file <input type="file" name="file" />
            <input type="submit" value="Upload" />
        </fieldset>
    }
}

As far as your server side code is concerned, here's how to proceed:

[HttpPost]
public ActionResult Upload(HttpPostedFileBase file) 
{
    if (file != null && file.ContentLength > 0) 
    {
        var fileName = Path.GetFileName(file.FileName);
        var path = Path.Combine(Server.MapPath("~/content/pics"), fileName);
        file.SaveAs(path);
    }
    return RedirectToAction("Upload");
}

How to run multiple DOS commands in parallel?

if you have multiple parameters use the syntax as below. I have a bat file with script as below:

start "dummyTitle" [/options] D:\path\ProgramName.exe Param1 Param2 Param3 
start "dummyTitle" [/options] D:\path\ProgramName.exe Param4 Param5 Param6

This will open multiple consoles.

Master Page Weirdness - "Content controls have to be top-level controls in a content page or a nested master page that references a master page."

In my case I was loading a user control dynamically in a page and both the page and user control had the content tags

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

Removing this tag from the user control worked for me.

How to make canvas responsive

extending accepted answer with jquery

what if you want to add more canvas?, this jquery.each answer it

responsiveCanvas(); //first init
$(window).resize(function(){
  responsiveCanvas(); //every resizing
  stage.update(); //update the canvas, stage is object of easeljs

});
function responsiveCanvas(target){
  $(canvas).each(function(e){

    var parentWidth = $(this).parent().outerWidth();
    var parentHeight =  $(this).parent().outerHeight();
    $(this).attr('width', parentWidth);
    $(this).attr('height', parentHeight);
    console.log(parentWidth);
  })

}

it will do all the job for you

why we dont set the width or the height via css or style? because it will stretch your canvas instead of make it into expecting size

POST JSON to API using Rails and HTTParty

The :query_string_normalizer option is also available, which will override the default normalizer HashConversions.to_params(query)

query_string_normalizer: ->(query){query.to_json}

Insert string in beginning of another string

private static void appendZeroAtStart() {
        String strObj = "11";
        int maxLegth = 5;

        StringBuilder sb = new StringBuilder(strObj);
        if (sb.length() <= maxLegth) {
            while (sb.length() < maxLegth) {
                sb.insert(0, '0');
            }
        } else {
            System.out.println("error");
        }

        System.out.println("result: " + sb);

    }

Get distance between two points in canvas

The distance between two coordinates x and y! x1 and y1 is the first point/position, x2 and y2 is the second point/position!

_x000D_

function diff (num1, num2) {_x000D_
  if (num1 > num2) {_x000D_
    return (num1 - num2);_x000D_
  } else {_x000D_
    return (num2 - num1);_x000D_
  }_x000D_
};_x000D_
_x000D_
function dist (x1, y1, x2, y2) {_x000D_
  var deltaX = diff(x1, x2);_x000D_
  var deltaY = diff(y1, y2);_x000D_
  var dist = Math.sqrt(Math.pow(deltaX, 2) + Math.pow(deltaY, 2));_x000D_
  return (dist);_x000D_
};

_x000D_

How to call asynchronous method from synchronous method in C#?

Convert UTC datetime string to local datetime

I traditionally defer this to the frontend -- send times from the backend as timestamps or some other datetime format in UTC, then let the client figure out the timezone offset and render this data in the proper timezone.

For a webapp, this is pretty easy to do in javascript -- you can figure out the browser's timezone offset pretty easily using builtin methods and then render the data from the backend properly.

Pandas split column of lists into multiple columns

list comprehension

simple implementation with list comprehension ( my favorite)

df = pd.DataFrame([pd.Series(x) for x in df.teams])
df.columns = ['team_{}'.format(x+1) for x in df.columns]

timing on output:

CPU times: user 0 ns, sys: 0 ns, total: 0 ns
Wall time: 2.71 ms

output:

team_1  team_2
0   SF  NYG
1   SF  NYG
2   SF  NYG
3   SF  NYG
4   SF  NYG
5   SF  NYG
6   SF  NYG

maxlength ignored for input type="number" in Chrome

The absolute solution that I've recently just tried is:

<input class="class-name" placeholder="1234567" name="elementname"  type="text" maxlength="4" onkeypress="return (event.charCode == 8 || event.charCode == 0 || event.charCode == 13) ? null : event.charCode >= 48 && event.charCode <= 57" />

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

I tried the top three rated answers but failed. After rebooting my mobile, the problem is solved. No more long "Waiting for Debugger".

Eclipse: Java was started but returned error code=13

This is caused when java is updated. You have to delete in environement path : C:**ProgramData\Oracle\Java\javapath**

Python update a key in dict if it doesn't exist

You do not need to call d.keys(), so

if key not in d:
    d[key] = value

is enough. There is no clearer, more readable method.

You could update again with dict.get(), which would return an existing value if the key is already present:

d[key] = d.get(key, value)

but I strongly recommend against this; this is code golfing, hindering maintenance and readability.

Modify tick label text

Try this :

  fig,axis = plt.subplots(nrows=1,ncols=1,figsize=(13,6),sharex=True)
  axis.set_xticklabels(['0', 'testing', '10000', '20000', '30000'],fontsize=22)

Is there a "standard" format for command line/shell help text?

yes, you're on the right track.

yes, square brackets are the usual indicator for optional items.

Typically, as you have sketched out, there is a commandline summary at the top, followed by details, ideally with samples for each option. (Your example shows lines in between each option description, but I assume that is an editing issue, and that your real program outputs indented option listings with no blank lines in between. This would be the standard to follow in any case.)

A newer trend, (maybe there is a POSIX specification that addresses this?), is the elimination of the man page system for documentation, and including all information that would be in a manpage as part of the program --help output. This extra will include longer descriptions, concepts explained, usage samples, known limitations and bugs, how to report a bug, and possibly a 'see also' section for related commands.

I hope this helps.

Express-js can't GET my static files, why?

I find my css file and add a route to it:

app.get('/css/MyCSS.css', function(req, res){
  res.sendFile(__dirname + '/public/css/MyCSS.css');
});

Then it seems to work.

How to get page content using cURL?

this is how:

   /**
     * Get a web file (HTML, XHTML, XML, image, etc.) from a URL.  Return an
     * array containing the HTTP server response header fields and content.
     */
    function get_web_page( $url )
    {
        $user_agent='Mozilla/5.0 (Windows NT 6.1; rv:8.0) Gecko/20100101 Firefox/8.0';

        $options = array(

            CURLOPT_CUSTOMREQUEST  =>"GET",        //set request type post or get
            CURLOPT_POST           =>false,        //set to GET
            CURLOPT_USERAGENT      => $user_agent, //set user agent
            CURLOPT_COOKIEFILE     =>"cookie.txt", //set cookie file
            CURLOPT_COOKIEJAR      =>"cookie.txt", //set cookie jar
            CURLOPT_RETURNTRANSFER => true,     // return web page
            CURLOPT_HEADER         => false,    // don't return headers
            CURLOPT_FOLLOWLOCATION => true,     // follow redirects
            CURLOPT_ENCODING       => "",       // handle all encodings
            CURLOPT_AUTOREFERER    => true,     // set referer on redirect
            CURLOPT_CONNECTTIMEOUT => 120,      // timeout on connect
            CURLOPT_TIMEOUT        => 120,      // timeout on response
            CURLOPT_MAXREDIRS      => 10,       // stop after 10 redirects
        );

        $ch      = curl_init( $url );
        curl_setopt_array( $ch, $options );
        $content = curl_exec( $ch );
        $err     = curl_errno( $ch );
        $errmsg  = curl_error( $ch );
        $header  = curl_getinfo( $ch );
        curl_close( $ch );

        $header['errno']   = $err;
        $header['errmsg']  = $errmsg;
        $header['content'] = $content;
        return $header;
    }

Example

//Read a web page and check for errors:

$result = get_web_page( $url );

if ( $result['errno'] != 0 )
    ... error: bad url, timeout, redirect loop ...

if ( $result['http_code'] != 200 )
    ... error: no page, no permissions, no service ...

$page = $result['content'];

How to checkout in Git by date?

Andy's solution does not work for me. Here I found another way:

git checkout `git rev-list -n 1 --before="2009-07-27 13:37" master`

Git: checkout by date

How do I fix the "You don't have write permissions into the /usr/bin directory" error when installing Rails?

Using the -n /usr/local/bin flag does work, BUT I had to come back to this page every time I wanted to update a package again. So I figured out a permanent fix for this.

For those interested in fixing this permanently:

Create a ~/.gemrc file

vim .gemrc

With the following content:

:gemdir:
   - ~/.gem/ruby
install: -n /usr/local/bin

Now you can run your command normally without the -n flag.

Enjoy!

How to create a List with a dynamic object type

It appears you might be a bit confused as to how the .Add method works. I will refer directly to your code in my explanation.

Basically in C#, the .Add method of a List of objects does not COPY new added objects into the list, it merely copies a reference to the object (it's address) into the List. So the reason every value in the list is pointing to the same value is because you've only created 1 new DyObj. So your list essentially looks like this.

DyObjectsList[0] = &DyObj; // pointing to DyObj
DyObjectsList[1] = &DyObj; // pointing to the same DyObj
DyObjectsList[2] = &DyObj; // pointing to the same DyObj

...

The easiest way to fix your code is to create a new DyObj for every .Add. Putting the new inside of the block with the .Add would accomplish this goal in this particular instance.

var DyObjectsList = new List<dynamic>; 
if (condition1) { 
    dynamic DyObj = new ExpandoObject(); 
    DyObj.Required = true; 
    DyObj.Message = "Message 1"; 
    DyObjectsList .Add(DyObj); 
} 
if (condition2) { 
    dynamic DyObj = new ExpandoObject(); 
    DyObj.Required = false; 
    DyObj.Message = "Message 2"; 
    DyObjectsList .Add(DyObj); 
}

your resulting List essentially looks like this

DyObjectsList[0] = &DyObj0; // pointing to a DyObj
DyObjectsList[1] = &DyObj1; // pointing to a different DyObj
DyObjectsList[2] = &DyObj2; // pointing to another DyObj

Now in some other languages this approach wouldn't work, because as you leave the block, the objects declared in the scope of the block could go out of scope and be destroyed. Thus you would be left with a collection of pointers, pointing to garbage.

However in C#, if a reference to the new DyObjs exists when you leave the block (and they do exist in your List because of the .Add operation) then C# does not release the memory associated with that pointer. Therefore the Objects you created in that block persist and your List contains pointers to valid objects and your code works.

Media Player called in state 0, error (-38,0)

It seems like Error -38 means a state-exception (as the error-message indicates). For example if you call start(), before the song was ready, or when you call pause(), even if the song isn't playing at all.

To fix this issue check the state of the mediaPlayer before calling the methods. For example:

if(mediaPlayer.isPlaying()) {
    mediaPlayer.pause();
}

Additionally, the MediaPlayer is sending event-messages. Even if you do not need the prepared-event (although it would be a good idea to not start the playback before this event was fired) you must set a callback-listener. This also holds true for the OnErrorListener, OnCompletionListener, OnPreparedListener and OnSeekCompletedListener (if you call the seek method).

Listeners can be attached simply by

mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
    @Override
    public void onPrepared(MediaPlayer mp) {
        // Do something. For example: playButton.setEnabled(true);
    }
});

How to debug when Kubernetes nodes are in 'Not Ready' state

Steps to debug:-

In case you face any issue in kubernetes, first step is to check if kubernetes self applications are running fine or not.

Command to check:- kubectl get pods -n kube-system

If you see any pod is crashing, check it's logs

if getting NotReady state error, verify network pod logs.

if not able to resolve with above, follow below steps:-

kubectl get nodes # Check which node is not in ready state
kubectl describe node nodename #nodename which is not in readystate
ssh to that node
execute systemctl status kubelet # Make sure kubelet is running
systemctl status docker # Make sure docker service is running
journalctl -u kubelet # To Check logs in depth

Most probably you will get to know about error here, After fixing it reset kubelet with below commands:-

systemctl daemon-reload
systemctl restart kubelet

In case you still didn't get the root cause, check below things:-

Make sure your node has enough space and memory. Check for /var directory space especially. command to check: -df -kh, free -m
Verify cpu utilization with top command. and make sure any process is not taking an unexpected memory.

Margin while printing html page

Updated, Simple Solution

@media print {
   body {
       display: table;
       table-layout: fixed;
       padding-top: 2.5cm;
       padding-bottom: 2.5cm;
       height: auto;
   }
}

Old Solution

Create section with each page, and use the below code to adjust margins, height and width.

If you are printing A4 size.

Then user

Size : 8.27in and 11.69 inches

@page Section1 {
    size: 8.27in 11.69in; 
    margin: .5in .5in .5in .5in; 
    mso-header-margin: .5in; 
    mso-footer-margin: .5in; 
    mso-paper-source: 0;
}



div.Section1 {
    page: Section1;
}

then create a div with all your content in it.

<div class="Section1"> 
    type your content here... 
</div>

SQL Server, division returns zero

Because it's an integer. You need to declare them as floating point numbers or decimals, or cast to such in the calculation.

How to do INSERT into a table records extracted from another table

I believe your problem in this instance is the "values" keyword. You use the "values" keyword when you are inserting only one row of data. For inserting the results of a select, you don't need it.

Also, you really don't need the parentheses around the select statement.

From msdn:

Multiple-record append query:

INSERT INTO target [(field1[, field2[, …]])] [IN externaldatabase]
SELECT [source.]field1[, field2[, …]
FROM tableexpression

Single-record append query:

INSERT INTO target [(field1[, field2[, …]])]     
VALUES (value1[, value2[, …])

Angular cookies

I make Miquels Version Injectable as service:

import { Injectable } from '@angular/core';

@Injectable()
export class CookiesService {

    isConsented = false;

    constructor() {}

    /**
     * delete cookie
     * @param name
     */
    public deleteCookie(name) {
        this.setCookie(name, '', -1);
    }

    /**
     * get cookie
     * @param {string} name
     * @returns {string}
     */
    public getCookie(name: string) {
        const ca: Array<string> = decodeURIComponent(document.cookie).split(';');
        const caLen: number = ca.length;
        const cookieName = `${name}=`;
        let c: string;

        for (let i  = 0; i < caLen; i += 1) {
            c = ca[i].replace(/^\s+/g, '');
            if (c.indexOf(cookieName) === 0) {
                return c.substring(cookieName.length, c.length);
            }
        }
        return '';
    }

    /**
     * set cookie
     * @param {string} name
     * @param {string} value
     * @param {number} expireDays
     * @param {string} path
     */
    public setCookie(name: string, value: string, expireDays: number, path: string = '') {
        const d: Date = new Date();
        d.setTime(d.getTime() + expireDays * 24 * 60 * 60 * 1000);
        const expires = `expires=${d.toUTCString()}`;
        const cpath = path ? `; path=${path}` : '';
        document.cookie = `${name}=${value}; ${expires}${cpath}; SameSite=Lax`;
    }

    /**
     * consent
     * @param {boolean} isConsent
     * @param e
     * @param {string} COOKIE
     * @param {string} EXPIRE_DAYS
     * @returns {boolean}
     */
    public consent(isConsent: boolean, e: any, COOKIE: string, EXPIRE_DAYS: number) {
        if (!isConsent) {
            return this.isConsented;
        } else if (isConsent) {
            this.setCookie(COOKIE, '1', EXPIRE_DAYS);
            this.isConsented = true;
            e.preventDefault();
        }
    }

}

Adding a favicon to a static HTML page

If the favicon is a png type image, it'll not work in older versions of Chrome. However it'll work just fine in FireFox. Also, don't forget to clear your browser cache while working on such things. Many a times, code is just fine, but cache is the real culprit.

The controller for path was not found or does not implement IController

In my case I had @{ Html.RenderAction("HeaderMenu", "Layout", new { Area = string.Empty }); } in _Layout.cshtml but the LayoutController did not exist! (I had copied _Layout.cshtml from another solution but forgot to copy the controller)

Regex how to match an optional character

You have to mark the single letter as optional too:

([A-Z]{1})? +.*? +

or make the whole part optional

(([A-Z]{1}) +.*? +)?

Automatic HTTPS connection/redirect with node.js/express

As of 0.4.12 we have no real clean way of listening for HTTP & HTTPS on the same port using Node's HTTP/HTTPS servers.

Some people have solved this issue by having having Node's HTTPS server (this works with Express.js as well) listen to 443 (or some other port) and also have a small http server bind to 80 and redirect users to the secure port.

If you absolutely have to be able to handle both protocols on a single port then you need to put nginx, lighttpd, apache, or some other web server on that port and have act as a reverse proxy for Node.

Check if string is in a pandas dataframe

a['Names'].str.contains('Mel') will return an indicator vector of boolean values of size len(BabyDataSet)

Therefore, you can use

mel_count=a['Names'].str.contains('Mel').sum()
if mel_count>0:
    print ("There are {m} Mels".format(m=mel_count))

Or any(), if you don't care how many records match your query

if a['Names'].str.contains('Mel').any():
    print ("Mel is there")

Casting a number to a string in TypeScript

"Casting" is different than conversion. In this case, window.location.hash will auto-convert a number to a string. But to avoid a TypeScript compile error, you can do the string conversion yourself:

window.location.hash = ""+page_number; 
window.location.hash = String(page_number);

These conversions are ideal if you don't want an error to be thrown when page_number is null or undefined. Whereas page_number.toString() and page_number.toLocaleString() will throw when page_number is null or undefined.

When you only need to cast, not convert, this is how to cast to a string in TypeScript:

window.location.hash = <string>page_number; 
// or 
window.location.hash = page_number as string;

The <string> or as string cast annotations tell the TypeScript compiler to treat page_number as a string at compile time; it doesn't convert at run time.

However, the compiler will complain that you can't assign a number to a string. You would have to first cast to <any>, then to <string>:

window.location.hash = <string><any>page_number;
// or
window.location.hash = page_number as any as string;

So it's easier to just convert, which handles the type at run time and compile time:

window.location.hash = String(page_number);

(Thanks to @RuslanPolutsygan for catching the string-number casting issue.)

Pause Console in C++ program

If you want to write portable C++ code, then I'd suggest using cin.get().

system("PAUSE") works on Windows, since it requires the execution of a console command named "PAUSE". But I'm not sure that other operating systems like Linux or other Unix derivatives support that. So that tends to be non-portable.

Since C++ already offers cin.get(), I see no compelling reason to use C getch().

How to remove all listeners in an element?

Here's a function that is also based on cloneNode, but with an option to clone only the parent node and move all the children (to preserve their event listeners):

function recreateNode(el, withChildren) {
  if (withChildren) {
    el.parentNode.replaceChild(el.cloneNode(true), el);
  }
  else {
    var newEl = el.cloneNode(false);
    while (el.hasChildNodes()) newEl.appendChild(el.firstChild);
    el.parentNode.replaceChild(newEl, el);
  }
}

Remove event listeners on one element:

recreateNode(document.getElementById("btn"));

Remove event listeners on an element and all of its children:

recreateNode(document.getElementById("list"), true);

If you need to keep the object itself and therefore can't use cloneNode, then you have to wrap the addEventListener function and track the listener list by yourself, like in this answer.

Is bool a native C type?

_Bool is a keyword in C99: it specifies a type, just like int or double.

6.5.2

2 An object declared as type _Bool is large enough to store the values 0 and 1.

SFTP Libraries for .NET

We use WinSCP. Its free. Its not a lib, but has a well documented and full featured command line interface that you can use with Process.Start.

Update: with v.5.0, WinSCP has a .NET wrapper library to the scripting layer of WinSCP.

How to use Redirect in the new react-router-dom of Reactjs

Hi if you are using react-router v-6.0.0-beta or V6 in This version Redirect Changes to Navigate like this

import { Navigate } from 'react-router-dom'; // like this CORRECT in v6 import { Redirect } from 'react-router-dom'; // like this CORRECT in v5

import { Redirect } from 'react-router-dom'; // like this WRONG in v6 // This will give you error in V6 of react-router and react-router dom

please make sure use both same version in package.json { "react-router": "^6.0.0-beta.0", //Like this "react-router-dom": "^6.0.0-beta.0", // like this }

this above things only works well in react Router Version 6

Secondary axis with twinx(): how to add to legend?

You can easily add a second legend by adding the line:

ax2.legend(loc=0)

You'll get this:

enter image description here

But if you want all labels on one legend then you should do something like this:

import numpy as np
import matplotlib.pyplot as plt
from matplotlib import rc
rc('mathtext', default='regular')

time = np.arange(10)
temp = np.random.random(10)*30
Swdown = np.random.random(10)*100-10
Rn = np.random.random(10)*100-10

fig = plt.figure()
ax = fig.add_subplot(111)

lns1 = ax.plot(time, Swdown, '-', label = 'Swdown')
lns2 = ax.plot(time, Rn, '-', label = 'Rn')
ax2 = ax.twinx()
lns3 = ax2.plot(time, temp, '-r', label = 'temp')

# added these three lines
lns = lns1+lns2+lns3
labs = [l.get_label() for l in lns]
ax.legend(lns, labs, loc=0)

ax.grid()
ax.set_xlabel("Time (h)")
ax.set_ylabel(r"Radiation ($MJ\,m^{-2}\,d^{-1}$)")
ax2.set_ylabel(r"Temperature ($^\circ$C)")
ax2.set_ylim(0, 35)
ax.set_ylim(-20,100)
plt.show()

Which will give you this:

enter image description here

Delay/Wait in a test case of Xcode UI testing

According to the API for XCUIElement .exists can be used to check if a query exists or not so the following syntax could be useful in some cases!

let app = XCUIApplication()
app.launch()

let label = app.staticTexts["Hello, world!"]
while !label.exists {
    sleep(1)
}

If you are confident that your expectation will be met eventually you could try running this. It should be noted that crashing might be preferable if the wait is too long in which case waitForExpectationsWithTimeout(_,handler:_) from @Joe Masilotti's post should be used.

Make a div fill up the remaining width

Although a bit late in posting an answer, here is an alternative approach without using margins.

<style>
    #divMain { width: 500px; }
    #div1 { width: 100px; float: left; background-color: #fcc; }
    #div2 { overflow:hidden; background-color: #cfc; }
    #div3 { width: 100px; float: right; background-color: #ccf; }
</style>

<div id="divMain">
    <div id="div1">
        div 1
    </div>
    <div id="div3">
        div 3
    </div>
    <div id="div2">
        div 2<br />bit taller
    </div>
</div>

This method works like magic, but here is an explanation :)\

Fiddle with a similar sample here.

Find an object in SQL Server (cross-database)

You can use sp_MSforeachdb to search all databases.

declare @RETURN_VALUE int

declare @command1 nvarchar(2000)

set @command1 = "Your command goes here"

exec @RETURN_VALUE = sp_MSforeachdb @command1 = @command1

Raj

how to add new <li> to <ul> onclick with javascript

There is nothing much to add to your code except appending the li tag to the ul

ul.appendChild(li)

and there you go just add this to your function and then it should work.

What is SYSNAME data type in SQL Server?

Is there use case you can provide?

If you ever have the need for creating some dynamic sql it is appropriate to use sysname as data type for variables holding table names, column names and server names.

In React Native, how do I put a view on top of another view, with part of it lying outside the bounds of the view behind?

import React, {Component} from 'react';
import {StyleSheet, View} from 'react-native';


export default class App extends Component {
  render() {
    return (
       <View>// you need to wrap the two Views an another View
          <View style={styles.box1}></View>
          <View style={styles.box2}></View>
       </View> 
    );
  }
}

const styles = StyleSheet.create({
  box1:{
    height:100,
    width:100,
    backgroundColor:'red'
  },
  box2:{
    height:100,
    width:100,
    backgroundColor:'green',
    position: 'absolute',
    top:10,
    left:30

  },
});

GIT_DISCOVERY_ACROSS_FILESYSTEM problem when working with terminal and MacFusion

My Problem was that I was not in the correct git directory that I just cloned.

How to compile a static library in Linux?

Here a full makefile example:

makefile

TARGET = prog

$(TARGET): main.o lib.a
    gcc $^ -o $@

main.o: main.c
    gcc -c $< -o $@

lib.a: lib1.o lib2.o
    ar rcs $@ $^

lib1.o: lib1.c lib1.h
    gcc -c -o $@ $<

lib2.o: lib2.c lib2.h
    gcc -c -o $@ $<

clean:
    rm -f *.o *.a $(TARGET)

explaining the makefile:

target: prerequisites - the rule head
$@ - means the target
$^ - means all prerequisites
$< - means just the first prerequisite
ar - a Linux tool to create, modify, and extract from archives see the man pages for further information. The options in this case mean:
- r - replace files existing inside the archive
- c - create a archive if not already existent
- s - create an object-file index into the archive

To conclude: The static library under Linux is nothing more than a archive of object files.

main.c using the lib

#include <stdio.h>

#include "lib.h"

int main ( void )
{
    fun1(10);
    fun2(10);
    return 0;
}

lib.h the libs main header

#ifndef LIB_H_INCLUDED
#define LIB_H_INCLUDED

#include "lib1.h"
#include "lib2.h"

#endif

lib1.c first lib source

#include "lib1.h"

#include <stdio.h>

void fun1 ( int x )
{
    printf("%i\n",x);
}

lib1.h the corresponding header

#ifndef LIB1_H_INCLUDED
#define LIB1_H_INCLUDED

#ifdef __cplusplus
   extern “C” {
#endif

void fun1 ( int x );

#ifdef __cplusplus
   }
#endif

#endif /* LIB1_H_INCLUDED */

lib2.c second lib source

#include "lib2.h"

#include <stdio.h>

void fun2 ( int x )
{
    printf("%i\n",2*x);
}

lib2.h the corresponding header

#ifndef LIB2_H_INCLUDED
#define LIB2_H_INCLUDED

#ifdef __cplusplus
   extern “C” {
#endif

void fun2 ( int x );

#ifdef __cplusplus
   }
#endif

#endif /* LIB2_H_INCLUDED */

How do I add python3 kernel to jupyter (IPython)

This answer explains how to create a Python 3, Jupyter 1, and ipykernel 5 workflow with Poetry dependency management. Poetry makes creating a virtual environment for Jupyter notebooks easy. I strongly recommend against running python3 commands. Python workflows that install global dependencies set you up for dependency hell.

Here's a summary of the clean, reliable Poetry workflow:

Install the dependencies with poetry add pandas jupyter ipykernel
Open a shell within the virtual environment with poetry shell
Open the Jupyter notebook with access to all the virtual environment dependencies with jupyter notebook

This blog discusses the workflow in more detail. There are clean Conda workflows as well. Watch out for a lot of the answers in this thread - they'll set you down a path that'll cause a lot of pain & suffering.

ADB server version (36) doesn't match this client (39) {Not using Genymotion}

I had the same error. In my case, using Appium, I had two versions of ADB

$ /usr/local/bin/adb version 36

and

$ /Users/user/Library/Android/sdk/platform-tools/adb version 39

The solution was:

be sure that your $PATH in bash_profile is pointing to: /Users/user/Library/Android/sdk/platform-tools/
stop the adb server: adb kill-server and check Appium is stopped.
delete the adb version 36 (or you can rename it to have a backup): rm /usr/local/bin/adb
start adb server: adb start-server or just starting Appium

How to disable text selection highlighting

I combined the various browser CSS select attributes with the unselectable tag required for Internet Explorer < 9.

<style>
[unselectable="on"] {
    -webkit-user-select: none; /* Safari */
    -moz-user-select: none; /* Firefox */
    -ms-user-select: none; /* Internet Explorer 10+/Edge */
    user-select: none; /* Standard */
}
</style>
<div unselectable="on">Unselectable Text</div>

Calendar Recurring/Repeating Events - Best Storage Method

Storing "Simple" Repeating Patterns

For my PHP/MySQL based calendar, I wanted to store repeating/recurring event information as efficiently as possibly. I didn't want to have a large number of rows, and I wanted to easily lookup all events that would take place on a specific date.

The method below is great at storing repeating information that occurs at regular intervals, such as every day, every n days, every week, every month every year, etc etc. This includes every Tuesday and Thursday type patterns as well, because they are stored separately as every week starting on a Tuesday and every week starting on a Thursday.

Assuming I have two tables, one called events like this:

ID    NAME
1     Sample Event
2     Another Event

And a table called events_meta like this:

ID    event_id      meta_key           meta_value
1     1             repeat_start       1299132000
2     1             repeat_interval_1  432000

With repeat_start being a date with no time as a unix timestamp, and repeat_interval an amount in seconds between intervals (432000 is 5 days).

repeat_interval_1 goes with repeat_start of the ID 1. So if I have an event that repeats every Tuesday and every Thursday, the repeat_interval would be 604800 (7 days), and there would be 2 repeat_starts and 2 repeat_intervals. The table would look like this:

ID    event_id      meta_key           meta_value
1     1             repeat_start       1298959200 -- This is for the Tuesday repeat
2     1             repeat_interval_1  604800
3     1             repeat_start       1299132000 -- This is for the Thursday repeat
4     1             repeat_interval_3  604800
5     2             repeat_start       1299132000
6     2             repeat_interval_5  1          -- Using 1 as a value gives us an event that only happens once

Then, if you have a calendar that loops through every day, grabbing the events for the day it's at, the query would look like this:

SELECT EV.*
FROM `events` EV
RIGHT JOIN `events_meta` EM1 ON EM1.`event_id` = EV.`id`
RIGHT JOIN `events_meta` EM2 ON EM2.`meta_key` = CONCAT( 'repeat_interval_', EM1.`id` )
WHERE EM1.meta_key = 'repeat_start'
    AND (
        ( CASE ( 1299132000 - EM1.`meta_value` )
            WHEN 0
              THEN 1
            ELSE ( 1299132000 - EM1.`meta_value` )
          END
        ) / EM2.`meta_value`
    ) = 1
LIMIT 0 , 30

Replacing {current_timestamp} with the unix timestamp for the current date (Minus the time, so the hour, minute and second values would be set to 0).

Hopefully this will help somebody else too!

Storing "Complex" Repeating Patterns

This method is better suited for storing complex patterns such as

Event A repeats every month on the 3rd of the month starting on March 3, 2011

Event A repeats Friday of the 2nd week of the month starting on March 11, 2011

I'd recommend combining this with the above system for the most flexibility. The tables for this should like like:

ID    NAME
1     Sample Event
2     Another Event

And a table called events_meta like this:

ID    event_id      meta_key           meta_value
1     1             repeat_start       1299132000 -- March 3rd, 2011
2     1             repeat_year_1      *
3     1             repeat_month_1     *
4     1             repeat_week_im_1   2
5     1             repeat_weekday_1   6

repeat_week_im represents the week of the current month, which could be between 1 and 5 potentially. repeat_weekday in the day of the week, 1-7.

Now assuming you are looping through the days/weeks to create a month view in your calendar, you could compose a query like this:

SELECT EV . *
FROM `events` AS EV
JOIN `events_meta` EM1 ON EM1.event_id = EV.id
AND EM1.meta_key = 'repeat_start'
LEFT JOIN `events_meta` EM2 ON EM2.meta_key = CONCAT( 'repeat_year_', EM1.id )
LEFT JOIN `events_meta` EM3 ON EM3.meta_key = CONCAT( 'repeat_month_', EM1.id )
LEFT JOIN `events_meta` EM4 ON EM4.meta_key = CONCAT( 'repeat_week_im_', EM1.id )
LEFT JOIN `events_meta` EM5 ON EM5.meta_key = CONCAT( 'repeat_weekday_', EM1.id )
WHERE (
  EM2.meta_value =2011
  OR EM2.meta_value = '*'
)
AND (
  EM3.meta_value =4
  OR EM3.meta_value = '*'
)
AND (
  EM4.meta_value =2
  OR EM4.meta_value = '*'
)
AND (
  EM5.meta_value =6
  OR EM5.meta_value = '*'
)
AND EM1.meta_value >= {current_timestamp}
LIMIT 0 , 30

This combined with the above method could be combined to cover most repeating/recurring event patterns. If I've missed anything please leave a comment.

Prolog "or" operator, query

Just another viewpoint. Performing an "or" in Prolog can also be done with the "disjunct" operator or semi-colon:

registered(X, Y) :-
    X = ct101; X = ct102; X = ct103.

For a fuller explanation:

Predicate control in Prolog

What is the best way to remove the first element from an array?

Keep an index of the first "live" element of the array. Removing (pretending to remove) the first element then becomes an O(1) time complexity operation.

How to increase apache timeout directive in .htaccess?

Just in case this helps anyone else:

If you're going to be adding the TimeOut directive, and your website uses multiple vhosts (eg. one for port 80, one for port 443), then don't forget to add the directive to all of them!

Call to undefined method mysqli_stmt::get_result

I know this was already answered as to what the actual problem is, however I want to offer a simple workaround.

I wanted to use the get_results() method however I didn't have the driver, and I'm not somewhere I can get that added. So, before I called

$stmt->bind_results($var1,$var2,$var3,$var4...etc);

I created an empty array, and then just bound the results as keys in that array:

$result = array();
$stmt->bind_results($result['var1'],$result['var2'],$result['var3'],$result['var4']...etc);

so that those results could easily be passed into methods or cast to an object for further use.

Hope this helps anyone who's looking to do something similar.

Pycharm does not show plot

Just add plt.pyplot.show(), that would be fine.

The best solution is disabling SciView.

How do I retrieve an HTML element's actual width and height?

also you can use this code:

var divID = document.getElementById("divid");

var h = divID.style.pixelHeight;

nginx: [emerg] "server" directive is not allowed here

There might be just a typo anywhere inside a file imported by the config. For example, I made a typo deep inside my config file:

loccation /sense/movies/ {
                  mp4;
        }

(loccation instead of location), and this causes the error:

nginx: [emerg] "server" directive is not allowed here in /etc/nginx/sites-enabled/xxx.xx:1

Mac install and open mysql using terminal

In MacOS, Mysql's executable file is located in /usr/local/mysql/bin/mysql and you can easily login to it with the following command:

/usr/local/mysql/bin/mysql -u USERNAME -p

But this is a very long command and very boring, so you can add mysql path to Os's Environment variable and access to it much easier.

For macOS Catalina and later

Starting with macOS Catalina, Mac devices use zsh as the default login shell and interactive shell and you have to update .zprofile file in your home directory.

echo 'export PATH="$PATH:/usr/local/mysql/bin"' >> ~/.zprofile
source ~/.zprofile
mysql -u USERNAME -p

For macOS Mojave and earlier

Although you can always switch to zsh, bash is the default shell in macOS Mojave and earlier and with bash you have to update .bash_profile file.

echo 'export PATH="$PATH:/usr/local/mysql/bin"' >> ~/.bash_profile
source ~/.bash_profile
mysql -u USERNAME -p

Storyboard - refer to ViewController in AppDelegate

    UIStoryboard * storyboard = [UIStoryboard storyboardWithName:@"Tutorial" bundle:nil];
    self.window.rootViewController = [storyboard instantiateInitialViewController];

java.util.regex - importance of Pattern.compile()?

Compile parses the regular expression and builds an in-memory representation. The overhead to compile is significant compared to a match. If you're using a pattern repeatedly it will gain some performance to cache the compiled pattern.

JavaScript get element by name

Note the plural in this method:

document.getElementsByName()

That returns an array of elements, so use [0] to get the first occurence, e.g.

document.getElementsByName()[0]

Extract a part of the filepath (a directory) in Python

All you need is parent part if you use pathlib.

from pathlib import Path
p = Path(r'C:\Program Files\Internet Explorer\iexplore.exe')
print(p.parent)

Will output:

C:\Program Files\Internet Explorer

Case you need all parts (already covered in other answers) use parts:

p = Path(r'C:\Program Files\Internet Explorer\iexplore.exe')
print(p.parts)

Then you will get a list:

('C:\\', 'Program Files', 'Internet Explorer', 'iexplore.exe')

Saves tone of time.

Convert java.util.date default format to Timestamp in Java

You can use the Calendar class to convert Date

public long getDifference()
{
    SimpleDateFormat sdf = new SimpleDateFormat("EEE MMM dd kk:mm:ss z yyyy");
    Date d = sdf.parse("Mon May 27 11:46:15 IST 2013");

    Calendar c = Calendar.getInstance();
    c.setTime(d);
    long time = c.getTimeInMillis();
    long curr = System.currentTimeMillis();
    long diff = curr - time;    //Time difference in milliseconds
    return diff/1000;
}

How can I see the current value of my $PATH variable on OS X?

Use the command:

 echo $PATH

and you will see all path:

/Users/name/.rvm/gems/ruby-2.5.1@pe/bin:/Users/name/.rvm/gems/ruby-2.5.1@global/bin:/Users/sasha/.rvm/rubies/ruby-2.5.1/bin:/Users/sasha/.rvm/bin:

How do I push a local repo to Bitbucket using SourceTree without creating a repo on bitbucket first?

GIT serves it's purpose well for version control and team projects if commits and branches are maintained properly.
Step 1: Clone your local repo using cli as mentioned by above answers

$ cd [path_to_repo]
$ git remote add origin ssh://[email protected]//.git
$ git push -u origin --all

Step 2: You can follow any of the above steps to push/pull your works. Easy way is to use git gui. It provides Graphical Interface so that it's easy to stage(add)/unstage, commit/uncommit and push/pull. Beginners can easily understand the git process.

$ git gui

(OR)
Step 2: As mentioned above. Cli codes will do the work.

$ git status
$ git add [file_name]
$ git commit _m "[Comit message"]"
$ git push origin master/branch_name

JavaScript editor within Eclipse

The new release of Eclipse (Helios) has an especific package for javascript web development. I haven't tried it yet, but it certainly worth a look.

Make a table fill the entire window

That is because, of course, there is no ACTUAL page height. Keep in mind that you scroll throughout the contents of a page vertically not horizontally, creating a limited width but unlimited height. What the selected answer did was to make the table take up the visible area and stay there no matter what(absolute positioning).So theoretically what you were trying to do was impossible

PHP array delete by value (not key)

Using array_search() and unset, try the following:

if (($key = array_search($del_val, $messages)) !== false) {
    unset($messages[$key]);
}

array_search() returns the key of the element it finds, which can be used to remove that element from the original array using unset(). It will return FALSE on failure, however it can return a false-y value on success (your key may be 0 for example), which is why the strict comparison !== operator is used.

The if() statement will check whether array_search() returned a value, and will only perform an action if it did.

HashMaps and Null values?

Its a good programming practice to avoid having null values in a Map.

If you have an entry with null value, then it is not possible to tell whether an entry is present in the map or has a null value associated with it.

You can either define a constant for such cases (Example: String NOT_VALID = "#NA"), or you can have another collection storing keys which have null values.

Please check this link for more details.

JavaScript: clone a function

const clone = (fn, context = this) => {
  // Creates a new function, optionally preserving desired context.
  const newFn = fn.bind(context);

  // Shallow copies over function properties, if any.
  return Object.assign(newFn, fn);
}

// Usage:

// Setup the function to copy from.
const log = (...args) => console.log(...args);
log.testProperty = 1;

// Clone and make sure the function and properties are intact.
const log2 = clone(log);
log2('foo');
// -> 'foo'
log2.testProperty;
// -> 1

// Make sure tweaks to the clone function's properties don't affect the original function properties.
log2.testProperty = 2;
log2.testProperty;
// -> 2
log.testProperty;
// -> 1

This clone function:

Preserves context.
Is a wrapper, and runs the original function.
Copies over function properties.

Note that this version only performs a shallow copy. If your function has objects as properties, the reference to the original object is preserved (same behavior as Object spread or Object.assign). This means that changing deep properties in the cloned function will affect the object referenced in the original function!

How can I open a .tex file?

I don't know what the .tex extension on your file means. If we are saying that it is any file with any extension you have several methods of reading it.

I have to assume you are using windows because you have mentioned notepad++.

Use notepad++. Right click on the file and choose "edit with notepad++"
Use notepad Change the filename extension to .txt and double click the file.
Use command prompt. Open the folder that your file is in. Hold down shift and right click. (not on the file, but in the folder that the file is in.) Choose "open command window here" from the command prompt type: "type filename.tex"

If these don't work, I would need more detail as to how they are not working. Errors that you may be getting or what you may expect to be in the file might help.

Programs & Examples On #Istream iterator

Server.UrlEncode vs. HttpUtility.UrlEncode

Change the Arrow buttons in Slick slider

jQuery Find and List all LI elements within a UL within a specific DIV

Stretch background image css?

NullInjectorError: No provider for AngularFirestore

The type or namespace name does not exist in the namespace 'System.Web.Mvc'

How display only years in input Bootstrap Datepicker?

Append to string variable

Vertical alignment of text and icon in button

What is the 'open' keyword in Swift?

How to completely DISABLE any MOUSE CLICK

Is it possible to pull just one file in Git?

Error : getaddrinfo ENOTFOUND registry.npmjs.org registry.npmjs.org:443

How to show Error & Warning Message Box in .NET/ How to Customize MessageBox

How to extract a string using JavaScript Regex?

How can I switch themes in Visual Studio 2012

Difference between string and char[] types in C++

Apply jQuery datepicker to multiple instances

Git: Pull from other remote

How can I change UIButton title color?

How to fix JSP compiler warning: one JAR was scanned for TLDs yet contained no TLDs?

Cannot use a leading ../ to exit above the top directory

You are trying to add a non-nullable field 'new_field' to userprofile without a default

Clearing a text field on button click

ReactJS - How to use comments?

Fade Effect on Link Hover?

file_get_contents() how to fix error "Failed to open stream", "No such file"

String replacement in Objective-C

Arrays.asList() of an array

Phonegap + jQuery Mobile, real world sample or tutorial

Print very long string completely in pandas dataframe

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

Reading a cell value in Excel vba and write in another Cell

Execute PHP scripts within Node.js web server

What's the valid way to include an image with no src?

Case statement in MySQL

At runtime, find all classes in a Java application that extend a base class

Ant if else condition?

Node update a specific package

Image re-size to 50% of original size in HTML

pip: no module named _internal

Why does comparing strings using either '==' or 'is' sometimes produce a different result?

PyCharm shows unresolved references error for valid code

jquery click event not firing?

How to download folder from putty using ssh client

Restoring database from .mdf and .ldf files of SQL Server 2008

C++ Array of pointers: delete or delete []?

Any way to replace characters on Swift String?

Is there an ignore command for git like there is for svn?

How to sort ArrayList<Long> in decreasing order?

How do you open an SDF file (SQL Server Compact Edition)?

How to use fetch in typescript

What is the GAC in .NET?

How to handle invalid SSL certificates with Apache HttpClient?

C# - Making a Process.Start wait until the process has start-up

Why is Dictionary preferred over Hashtable in C#?

What is an AssertionError? In which case should I throw it from my own code?

Array Size (Length) in C#

window.close and self.close do not close the window in Chrome

Is there a command like "watch" or "inotifywait" on the Mac?

How to refactor Node.js code that uses fs.readFileSync() into using fs.readFile()?

EXCEL VBA, inserting blank row and shifting cells

Java system properties and environment variables

How to change plot background color?

A long bigger than Long.MAX_VALUE

Xcode error: Code signing is required for product type 'Application' in SDK 'iOS 10.0'

Replace all 0 values to NA

Android Fragment no view found for ID?

Javascript regular expression password validation having special characters

Force an Android activity to always use landscape mode

Convert .cer certificate to .jks

How do I serialize a Python dictionary into a string, and then back to a dictionary?

How to write the Fibonacci Sequence?

AngularJS : ng-click not working

Share application "link" in Android

Can Windows Containers be hosted on linux?

Enum String Name from Value

How to parse a query string into a NameValueCollection in .NET

How to use regex with find command?