It called a &quot;Gutter Indicator&quot;.

It means a line has been deleted from the previous version of the file (based on git).

I would like to know regarding following behavior of `instanceof` operator in Java.

    interface C {}

    class B {}

    public class A {
        public static void main(String args[]) {
            B obj = new B();
            System.out.println(obj instanceof A);      //Gives compiler error
            System.out.println(obj instanceof C);      //Gives false as output
        }
    }

Why is it so? There is no relation between `interface C` and `class B`, but it gives false whereas in case of `obj instanceof A` it gives compiler error?


The &#39;instanceof&#39; operator behaves differently for interfaces and classes

In ASP.NET MVC 4.5.2 Framework, after typing `@Html.LabelFor()` or `@Html.EditorFor()` in a view, I&#39;m getting this error:

&gt; The type &#39;`Expression&lt;&gt;`&#39; is defined in an assembly that is not referenced. You must add a reference to assembly &#39;`System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089`&#39;.

I have added assembly reference System.Core.dll, Version 4.0.0.0, Runtime Version v4.0.30319, and also I did in web.config.

The type &#39;Expression&lt;&gt;&#39; is defined in an assembly that is not referenced

See here, between line 15 and 16. Does it just indicate a blank line? If so, why?

![Red arrow in Visual Studio Code.][1]


  [1]: http://i.stack.imgur.com/DIsfa.png

What&#39;s the little red arrow in VS Code?

<p>See here, between line 15 and 16. Does it just indicate a blank line? If so, why?</p>
<p><img src="http://i.stack.imgur.com/DIsfa.png" alt="Red arrow in Visual Studio Code."></p>


Visual Studio Code always seems to remember my session and reopen the files and/or projects that were open the last time I used it. It obviously behaves correctly when running it from the command line with a file or folder supplied, but when opening from a taskbar shortcut, I&#39;d like it to default to an empty environment.

Is there any way to change this behavior?

How to prevent Visual Studio Code from always reopening the previous files or folders?

I&#39;m trying to use the multi cursor functionality of vscode on a large(ish) file.
the file is too large to select every line individually with ctrl-alt-up or down. In sublime-text I would select everything and push ctrl-shift-l. Is there a similar thing in vscode. I&#39;ve tried using a regex search for ^, but that gives me an error stating &quot;Expression matches everything&quot;. 

How do I get a cursor on every line in vscode

I am working on a typescript project in Visual Studio code and would like to hide the `.js.map` (and maybe even the `.js`) files from appearing in the file explorer.  

Is it possible to display only the `.ts` files in the file explorer?

Hide .js.map files in Visual Studio Code: File Nesting

How would you filter files shown in folder view in [Visual Studio Code](https://code.visualstudio.com/)?

Reference: [Filter files shown in folder view](https://visualstudio.uservoice.com/forums/293070-visual-studio-code/suggestions/7755693-filter-files-shown-in-folder-view)


Filter files shown in Visual Studio Code

Is there a way to execute JavaScript and display the results using **Visual Studio Code**?

For example, a script file containing:

    console.log(&#39;hello world&#39;);

I assume that Node.js would be needed but can&#39;t work out how to do it?

&gt; By **[Visual Studio Code][1]** I mean the new Code Editor from Microsoft -
&gt; Not code written using Visual Studio.


  [1]: https://code.visualstudio.com/

Content Type	Original Author	Original Content on Stackoverflow
Question	Josh M.	View Question on Stackoverflow
Solution 1 - Visual Studio-Code	Amit	View Answer on Stackoverflow

What's the little red arrow in VS Code?

Visual Studio-Code Problem Overview

Visual Studio-Code Solutions

Solution 1 - Visual Studio-Code

The type 'Expression<>' is defined in an assembly that is not referenced

The 'instanceof' operator behaves differently for interfaces and classes

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