For JSHint you can create `.jshintrc` to your project directory with

    {
      &quot;globals&quot;: { &quot;MyProject&quot;: true }
    }

This is only for globals

    /* global MyProject */

In your case you need

    /* exported MyProject */



JSLint has a textarea below the options that says `predefine global variables here` in it.  Just add the variable names in there before running the check.

JSHint doesn&#39;t allow you to add global variables, but you can uncheck the `When variable is undefined` option to suppress that warning.

The JSHint library also has parameters for globals, if you run it as a library . . . details in here: http://jshint.com/docs/

I&#39;m reading about *volatile* keyword in Java and completely understand the theory part of it.

But, what I&#39;m searching for is, a good case example, which shows what would happen if variable wasn&#39;t *volatile* and if it were.

Below code snippet doesn&#39;t work as expected (taken from [here][1]):

    class Test extends Thread {
    
        boolean keepRunning = true;
    
        public void run() {
            while (keepRunning) {
            }
    
            System.out.println(&quot;Thread terminated.&quot;);
        }
    
        public static void main(String[] args) throws InterruptedException {
            Test t = new Test();
            t.start();
            Thread.sleep(1000);
            t.keepRunning = false;
            System.out.println(&quot;keepRunning set to false.&quot;);
        }
    }

Ideally, if `keepRunning` wasn&#39;t *volatile*, thread should keep on running indefinitely. But, it does stop after few seconds.

I&#39;ve got two basic questions:

 - Can anyone explain volatile with example? Not with theory from JLS.
 - Is volatile substitute for synchronization? Does it achieve atomicity?


  [1]: https://stackoverflow.com/a/10764147/2546848

Simplest and understandable example of volatile keyword in Java

Is it possible to have a placeholder on a select tag?

    &lt;select placeholder=&quot;select your beverage&quot;&gt;
       
       &lt;option&gt;Tea&lt;/option&gt;

       &lt;option&gt;coffee&lt;/option&gt;

       &lt;option&gt;soda&lt;/option&gt;

    &lt;/select&gt;

or may be a possible work around?

placeholder for select tag

In my project we have some global variables that work as containers:

    MyProject.MyFreature.someFunction = function() { ... }

So then I use that script across the site and JSLint / JSHint complains about that:

&gt; &#39;MyProject&#39; is not defined

I know that I can go to every JavaScript file and add the comment `/*global MyProject*/` on top of it. But I&#39;m looking a way to define that comment in some sort of config file so I don&#39;t have to go file by file adding this comment.

Some kind on option in the `config/jshint.yml` would be nice.

How to tell JSLint / JSHint what global variables are already defined

In my project we have some global variables that work as containers:
<pre><code class="hljs language-ini">MyProject.MyFreature.someFunction = function() { ... }
</code></pre>
So then I use that script across the site and JSLint / JSHint complains about that:
> 'MyProject' is not defined
I know that I can go to every JavaScript file and add the comment <code>/*global MyProject*/</code> on top of it. But I'm looking a way to define that comment in some sort of config file so I don't have to go file by file adding this comment.
Some kind on option in the <code>config/jshint.yml</code> would be nice.

    &lt;input type=&quot;file&quot; id=&quot;asd&quot;/&gt;

I would like to get the image in **base64** once the user chose that (before submitting the form)

Something like :

    $(input).on(&#39;change&#39;,function(){
      var data = $(this).val().base64file(); // it is not a plugin is just an example
      alert(data);
    });

 I read about File API and other stuffs, I would like a simple and cross-browsers solution (IE6/IE7 excluded obviously)

Any help appreciated thanks.



Image convert to Base64

The client has given me a design which has a Select Option menu containing a checkbox together with the item name as individual items in the list.
Is there anyway possible to add a checkbox inside a Select Option menu?

NB: Developer needs to add his own id to make the menu effective, I only need the HTML CSS code if it is possible.

How to use Checkbox inside Select Option

How is a promise/defer library like [q](https://github.com/kriskowal/q) implemented?  I was trying to read the source code but found it pretty hard to understand, so I thought it&#39;d be great if someone could explain to me, from a high level, what are the techniques used to implement promises in single-thread JS environments like Node and browsers.

How is a promise/defer library implemented?

Using JavaScript, how can I remove the last comma,  but only if the comma is the last character or if there is only white space after the comma? This is my code.
I got a working [fiddle][1]. But it has a bug. 

    var str = &#39;This, is a test.&#39;; 
    alert( removeLastComma(str) ); // should remain unchanged
    
    var str = &#39;This, is a test,&#39;; 
    alert( removeLastComma(str) ); // should remove the last comma
    
    var str = &#39;This is a test,          &#39;; 
    alert( removeLastComma(str) ); // should remove the last comma
    
    function removeLastComma(strng){        
        var n=strng.lastIndexOf(&quot;,&quot;);
        var a=strng.substring(0,n) 
        return a;
    }


  [1]: http://jsfiddle.net/96bEy/

Remove Last Comma from a string

I need to create a random number between 0.0200 and 0.120 using JavaScript. How would I do this?

Get a random number between 0.0200 and 0.120 (float numbers)

Based on [my reference][1], primitive types have default values and Objects are null. I tested a piece of code.

    public class Main {
        public static void main(String[] args) {
            int a;
            System.out.println(a);
        }
    }

The line `System.out.println(a);` will be an error pointing at the variable `a` that says `variable a might not have been initialized` whereas in the given reference, `integer` will have `0` as a default value. However, with the given code below, it will actually print `0`.

    public class Main {
        static int a;
        public static void main(String[] args) {
            System.out.println(a);
        }
    }

What could possibly go wrong with the first code? Do class variables behave different from local variables?

  [1]: http://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html








Default values and initialization in Java

I&#39;m trying to find out why the use of `global` is considered to be bad practice in python (and in programming in general). Can somebody explain? Links with more info would also be appreciated.

Why are global variables evil?

I&#39;m trying to understand what happens when modules with globals and static variables are dynamically linked to an application. 
By modules, I mean each project in a solution (I work a lot with visual studio!). These modules are either built into *.lib or *.dll or the *.exe itself.

I understand that the binary of an application contains global and static data of all the individual translation units (object files) in the data segment (and read only data segment if const).

- What happens when this application uses a module A with load-time dynamic linking? I assume the DLL has a section for its globals and statics. Does the operating system load them? If so, where do they get loaded to?

- And what happens when the application uses a module B with run-time dynamic linking?

- If I have two modules in my application that both use A and B, are copies of A and B&#39;s globals created as mentioned below (if they are different processes)?

- Do DLLs A and B get access to the applications globals?

(Please state your reasons as well)

Quoting from [MSDN]:

&gt; Variables that are declared as global in a DLL source code file are treated as global variables by the compiler and linker, but each process that loads a given DLL gets its own copy of that DLL&#39;s global variables. The scope of static variables is limited to the block in which the static variables are declared. As a result, each process has its own instance of the DLL global and static variables by default.


and from [here][1]:

&gt; When dynamically linking modules, it can be unclear whether different libraries have their own instances of globals or whether the globals are shared.


  [MSDN]: http://msdn.microsoft.com/en-us/library/windows/desktop/ms682594%28v=vs.85%29.aspx


  [1]: http://c2.com/cgi/wiki?GlobalVariablesAreBad

Thanks.

What happens to global and static variables in a shared library when it is dynamically linked?

First of all, I checked and I didn&#39;t find any article covering my question.

How to access a pre-defined js global variable in angularJS built-in directive?

For example, I define this variable in `&lt;script&gt;var variable1 = true; &lt;/script&gt;` 

Then I write a AngularJS directive:

`&lt;div ng-if=&quot;variable1&quot;&gt;Show some hidden stuff!&lt;/div&gt;`

This does not really work.

Then I&#39;m informed that I should use `ng-init`

So I wrote code somewhere else like:

`&lt;div ng-init = &quot;angularVariable1 = variable1&quot;&gt;&lt;/div&gt;`

And this apparently does not work as well...this is like a vicious cycle. You need to access pre-defined js global variables, then you need to use ng-init; in order to use ng-init, you need to access global variables.

Any particular way to do this?

How to access global js variable in AngularJS directive

I know that in general, global-variables are to be avoided. Nevertheless, I think in a practical sense, it is sometimes desirable (in situations where the variable is integral to the program) to use them.

In order to learn Rust, I&#39;m currently writing a database test program using sqlite3 and the Rust/sqlite3 package on GitHub. Consequently, that necessitates (in my test-program) (as an alternative to a global variable), to pass the database variable between functions of which there are about a dozen. An example is below.

1. Is it possible and feasible and desirable to use global variables in Rust?

2. Given the example below, can I declare and use a global variable?

&lt;!-- --&gt;

    extern crate sqlite;

    fn main() {
        let db: sqlite::Connection = open_database();
    
        if !insert_data(&amp;db, insert_max) {
            return;
        }
    }

I tried the following, but it doesn&#39;t appear to be quite right and resulted in the errors below (I tried also with an `unsafe` block):

    extern crate sqlite;
    
    static mut DB: Option&lt;sqlite::Connection&gt; = None;
    
    fn main() {
        DB = sqlite::open(&quot;test.db&quot;).expect(&quot;Error opening test.db&quot;);
        println!(&quot;Database Opened OK&quot;);
    
        create_table();
        println!(&quot;Completed&quot;);
    }
    
    // Create Table
    fn create_table() {
        let sql = &quot;CREATE TABLE IF NOT EXISTS TEMP2 (ikey INTEGER PRIMARY KEY NOT NULL)&quot;;
        match DB.exec(sql) {
            Ok(_) =&gt; println!(&quot;Table created&quot;),
            Err(err) =&gt; println!(&quot;Exec of Sql failed : {}\nSql={}&quot;, err, sql),
        }
    }

Errors that resulted from compile:

&lt;!-- language: none --&gt;

    error[E0308]: mismatched types
     --&gt; src/main.rs:6:10
      |
    6 |     DB = sqlite::open(&quot;test.db&quot;).expect(&quot;Error opening test.db&quot;);
      |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected enum `std::option::Option`, found struct `sqlite::Connection`
      |
      = note: expected type `std::option::Option&lt;sqlite::Connection&gt;`
                 found type `sqlite::Connection`
    
    error: no method named `exec` found for type `std::option::Option&lt;sqlite::Connection&gt;` in the current scope
      --&gt; src/main.rs:16:14
       |
    16 |     match DB.exec(sql) {
       |              ^^^^


Is it possible to use global variables in Rust?

This is the error I get when using const:

    &lt;error line=&quot;2&quot; column=&quot;1&quot; severity=&quot;warning&quot; message=&quot;&amp;apos;const&amp;apos; is available in ES6 (use esnext option) or Mozilla JS extensions (use moz).&quot; source=&quot;jshint.W104&quot; /&gt;


My code looks like this:

    const Suites = {
        Spade: 1,
        Heart: 2,
        Diamond: 3,
        Club: 4
    };

The code works fine only JSHint is warning me every time.

Why does JSHint throw a warning if I am using const?

From time to time, I get TSLint errors &quot;block is empty&quot;. This happens e.g. when I pass a no-op callback to a function:

    doSomething(() =&gt; {});

From what I read, JSLint apparently does the same, but I didn&#39;t verify that.

I find these usages completely valid, so I tried to find a reason why empty blocks are considered bad at all. But the only thing I&#39;m able to find (e.g. in [this answer](https://stackoverflow.com/a/17685875/219187)) are instructions to add a `return;` to avoid the error. This is **not** what I want to do in every empty callback.

Why does TSLint report above empty block as problem? Is there any reason why I shouldn&#39;t disable the check?

Why do TSLint and JSLint report empty blocks?

I have this code:

     if ( something is true ) {
            var someVar = true;
        } else {
           var someVar = false;
        }

JsHint is saying that &quot;someVar was already defined&quot; on the else statement part. Why is this and how do I fix it?

Thanks

Why is Jshint saying &quot;variable already defined&quot; in this if statement?

Having a bit of an issue with JShint and the following line of code.

    $location.path(&#39;map-&#39; + map.id + &#39;/venue-&#39; + map.attributes.default_venue.value);

I&#39;m getting the error, `Identifier &#39;default_venue&#39; is not in camel case.` This wouldn&#39;t be a problem normally but I don&#39;t have any control over the variable name - it&#39;s brought in via a JSON API.

Is there any way I could suppress this issue for either the affected variables or on the lines in which they appear?

Apologies if this has been asked before, I&#39;m pretty sure it must have been but I can&#39;t find a solution.

Ignore camelcase variable in JSHint

Hi I am having a trouble when my framework is using jshint to validate my `javascript` code. I have used switch-case without a break statement intentionally, but this portion of code is captured as an error when `jshint` checks. My code is something like below.

        switch (&lt;no&gt;){
        case 1:
            // does something
        case 2:
            //does something more
        default:
            // does something even more
       }

`Error from &#39;jshint&#39; is like Line 203 character 41: Expected a &#39;break&#39; statement before &#39;case&#39;.`
Any thoughts on how to avoid it ? or is it a bad practice to use switch cases in this scenario at all ?

jshint throws a&quot;Expected a &#39;break&#39; statement before &#39;case&#39;&quot;

In order to turn off linting rule for a particular line in JSHint we use the following rule:

    /* jshint ignore:start*/
    $scope.someVar = ConstructorFunction();
    /* jshint ignore:end */

I have been trying to locate the equivalent of the above for eslint. 
 

Content Type	Original Author	Original Content on Stackoverflow
Question	Emiliano Zilocchi	View Question on Stackoverflow
Solution 1 - Javascript	Epeli	View Answer on Stackoverflow
Solution 2 - Javascript	zevero	View Answer on Stackoverflow
Solution 3 - Javascript	talemyn	View Answer on Stackoverflow

How to tell JSLint / JSHint what global variables are already defined

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

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Solution 3 - Javascript

placeholder for select tag

Simplest and understandable example of volatile keyword in Java

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