In Resharper 2016 this has been renamed to ECMAScript 2015. It&#39;s available under 

Resharper Options | Code Editing | Javascript | Inspections

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/bCpAv.png

ReSharper 9.2 uses ECMAScript version specified in Project Properties | Typescript Build | ECMAScript version. [![enter image description here][1]][1]


  [1]: http://i.stack.imgur.com/EgmvZ.png

I&#39;m trying to upgrade setuptools. Well actually I&#39;m trying to upgrade ansible but it&#39;s trying to upgrade setuptools and failing. Trying to do it myself also fails. Even trying to uninstall it fails

&lt;!-- language: lang-none --&gt;

	$ sudo -H pip install --upgrade setuptools
	Collecting setuptools
	  Using cached setuptools-18.4-py2.py3-none-any.whl
	Installing collected packages: setuptools
	  Found existing installation: setuptools 1.1.6
	    Uninstalling setuptools-1.1.6:
	Exception:
	Traceback (most recent call last):
	  File &quot;/Library/Python/2.7/site-packages/pip-7.1.2-py2.7.egg/pip/basecommand.py&quot;, line 211, in main
	    status = self.run(options, args)
	  File &quot;/Library/Python/2.7/site-packages/pip-7.1.2-py2.7.egg/pip/commands/install.py&quot;, line 311, in run
	    root=options.root_path,
	  File &quot;/Library/Python/2.7/site-packages/pip-7.1.2-py2.7.egg/pip/req/req_set.py&quot;, line 640, in install
	    requirement.uninstall(auto_confirm=True)
	  File &quot;/Library/Python/2.7/site-packages/pip-7.1.2-py2.7.egg/pip/req/req_install.py&quot;, line 716, in uninstall
	    paths_to_remove.remove(auto_confirm)
	  File &quot;/Library/Python/2.7/site-packages/pip-7.1.2-py2.7.egg/pip/req/req_uninstall.py&quot;, line 125, in remove
	    renames(path, new_path)
	  File &quot;/Library/Python/2.7/site-packages/pip-7.1.2-py2.7.egg/pip/utils/__init__.py&quot;, line 315, in renames
	    shutil.move(old, new)
	  File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py&quot;, line 299, in move
	    copytree(src, real_dst, symlinks=True)
	  File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py&quot;, line 208, in copytree
	    raise Error, errors
	Error: [(&#39;/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.py&#39;, &#39;/tmp/pip-OyTXsR-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.py&#39;, &quot;[Errno 1] Operation not permitted: &#39;/tmp/pip-OyTXsR-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.py&#39;&quot;), (&#39;/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.pyc&#39;, &#39;/tmp/pip-OyTXsR-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.pyc&#39;, &quot;[Errno 1] Operation not permitted: &#39;/tmp/pip-OyTXsR-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/__init__.pyc&#39;&quot;), (&#39;/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.py&#39;, &#39;/tmp/pip-OyTXsR-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.py&#39;, &quot;[Errno 1] Operation not permitted: &#39;/tmp/pip-OyTXsR-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.py&#39;&quot;), (&#39;/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.pyc&#39;, &#39;/tmp/pip-OyTXsR-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.pyc&#39;, &quot;[Errno 1] Operation not permitted: &#39;/tmp/pip-OyTXsR-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib/markers.pyc&#39;&quot;), (&#39;/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib&#39;, &#39;/tmp/pip-OyTXsR-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib&#39;, &quot;[Errno 1] Operation not permitted: &#39;/tmp/pip-OyTXsR-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/_markerlib&#39;&quot;)]

I haven&#39;t the foggiest idea what&#39;s wrong. Looking at all the files in `/System/Library/Frameworks/Python.framework/Versions/2.7/` and below every single file is owned by `root:wheel`

How can I fix it?


Upgrading setuptools on OSX El Capitan

I have a simple method that at the end of it I want to redirect to another component:

    export class AddDisplay{
      display: any;
    
      addPairTo(name: string, pairTo: string){
        this.display = {};
        this.display.name = name;
        this.display.pairTo = pairTo;
        
      }
    }

What I wanna do is at the end of the method redirect to another component:

    export class AddDisplay{
      display: any;
    
      addPairTo(name: string, pairTo: string){
        this.display = {};
        this.display.name = name;
        this.display.pairTo = pairTo;
        
        this.redirectTo(&#39;foo&#39;);
      }
    }

How do I achieve this in Angular 2?

Redirect within component Angular 2

Consider the image below:

[![enter image description here][1]][1]


 - How can I configure Resharper&#39;s language level for ECMAScript 6?

  [1]: http://i.stack.imgur.com/c80oT.png

How can I configure Resharper&#39;s language level for ECMAScript 6?

<p>Consider the image below:</p>
<p><a href="http://i.stack.imgur.com/c80oT.png" target="_blank" rel="noopener noreferrer"><img src="http://i.stack.imgur.com/c80oT.png" alt="enter image description here"></a></p>
<ul>
<li>How can I configure Resharper's language level for ECMAScript 6?</li>
</ul>


I suddenly started experiencing a problem today in my project where clicking Go To Definition gives me a strange error: &quot;Cannot navigate to the symbol under the caret.&quot;

[![enter image description here][1]][1]

I first noticed it some time after installing [Costura.Fody][2] via NuGet. I&#39;ve since uninstalled it but the problem persists. I&#39;ve cleaned and rebuilt the solution multiple times. There are no instances of &quot;Fody&quot; or &quot;Costura&quot; anywhere in my git commit history, before or after the point in time when this started happening, so I&#39;m thinking that one of my .gitignore&#39;d files is stuck in a bad state.

The problem only occurs if the definition being targeted is in another file; Go To Definition for something in the currently opened file works fine. Peek Definition works fine too. Other solutions/projects work fine as well -- it&#39;s only this one that&#39;s causing issues.

I&#39;m using Visual Studio 2015. The issue doesn&#39;t seem to occur in the 2013 version.

Why does this error occur and how can I fix it?

  [1]: http://i.stack.imgur.com/lq4TY.png
  [2]: https://github.com/Fody/Costura

Go To Definition: &quot;Cannot navigate to the symbol under the caret.&quot;

1. Is there a reason why the references count _(code lens)_ is missing in Visual Studio Community edition? 
2. Is is possible to enable it in the options?

Here is a screenshot of Visual Studio 2015 and 2017 Community edition:

[![methods without code lens][1]][1]

Here is a screenshot of Visual Studio 2013:

[![methods with code lens][2]][2]

&lt;sup&gt;source: [dailydotnettips.com][3]&lt;/sup&gt;


  [1]: http://i.stack.imgur.com/3rg7L.png
  [2]: http://i.stack.imgur.com/jpSiE.png
  [3]: https://www.google.be/url?sa=i&amp;rct=j&amp;q=&amp;esrc=s&amp;source=images&amp;cd=&amp;cad=rja&amp;uact=8&amp;ved=0CAMQjxxqFQoTCPHCxqmUxMgCFQbrFAodv2UHhw&amp;url=http%3A%2F%2Fdailydotnettips.com%2F2013%2F07%2F15%2Ffind-the-references-easily-code-reference-indicator-in-visual-studio-2013-preview%2F&amp;psig=AFQjCNHbp66-FlQuAczqg9SdtMsisS0BzQ&amp;ust=1444987563698186

Missing CodeLens references count in Visual Studio Community edition 2015 and 2017

I am new to C# and downloaded the free version of Microsoft Visual Studio 2015. To write a first program, I created a Windows Forms Application. Now I use     `Console.Out.WriteLine()` to print some test data. But where can I read the console?

Where can I read the Console output in Visual Studio 2015

Starting from today, a WPF project that belongs to a solution with 20 projects, set all my references to missing

[![enter image description here][1]][1]

I&#39;ve just checked the MS suggestion and the other answers on Stackoverflow but none worked...I&#39;ve tried to re-get solution from SVN, with no luck, other colleagues haven&#39;t got this problem.
I&#39;ve also tried to remove and re-add the references (System.Xml for example) . 
But no way to make it work...

Any suggestion?
Thanks

# UPDATE #1
Here&#39;s the csproj

     &lt;ItemGroup&gt;
    &lt;Reference Include=&quot;Catel.Core, Version=4.2.0.0, Culture=neutral, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Catel.Core.4.2.0\lib\net40\Catel.Core.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;Catel.Extensions.Controls, Version=4.2.0.0, Culture=neutral, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Catel.Extensions.Controls.4.2.0\lib\net40\Catel.Extensions.Controls.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;Catel.Extensions.FluentValidation, Version=4.2.0.0, Culture=neutral, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Catel.Extensions.FluentValidation.4.2.0\lib\net40\Catel.Extensions.FluentValidation.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;Catel.Fody.Attributes, Version=2.8.0.0, Culture=neutral, PublicKeyToken=1c8163524cbe02e6, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Catel.Fody.2.8.0\lib\portable-net4+sl4+wp7+win8+wpa81+MonoAndroid14+MonoTouch40\Catel.Fody.Attributes.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;Catel.MVVM, Version=4.2.0.0, Culture=neutral, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Catel.MVVM.4.2.0\lib\net40\Catel.MVVM.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;MethodTimer, Version=1.15.7.0, Culture=neutral, PublicKeyToken=cb1364609f40a1dc, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\MethodTimer.Fody.1.15.7.0\Lib\portable-net4+sl5+wp8+win8+wpa81+MonoAndroid16+MonoTouch40\MethodTimer.dll&lt;/HintPath&gt;
      &lt;Private&gt;False&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;Microsoft.Threading.Tasks, Version=1.0.12.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;Microsoft.Threading.Tasks.Extensions, Version=1.0.12.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.Extensions.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;Microsoft.Threading.Tasks.Extensions.Desktop, Version=1.0.168.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.Extensions.Desktop.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;PresentationCore&quot; /&gt;
    &lt;Reference Include=&quot;PresentationFramework&quot; /&gt;
    &lt;Reference Include=&quot;ServiceStack&quot;&gt;
      &lt;HintPath&gt;..\packages\ServiceStack.4.0.46\lib\net40\ServiceStack.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;ServiceStack.Client, Version=4.0.46.0, Culture=neutral, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\ServiceStack.Client.4.0.46\lib\net40\ServiceStack.Client.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;ServiceStack.Common&quot;&gt;
      &lt;HintPath&gt;..\packages\ServiceStack.Common.4.0.46\lib\net40\ServiceStack.Common.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;ServiceStack.Interfaces, Version=4.0.0.0, Culture=neutral, PublicKeyToken=e06fbc6124f57c43, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\ServiceStack.Interfaces.4.0.46\lib\portable-wp80+sl5+net40+win8+monotouch+monoandroid+xamarin.ios10\ServiceStack.Interfaces.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;ServiceStack.Text, Version=4.0.46.0, Culture=neutral, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\ServiceStack.Text.4.0.46\lib\net40\ServiceStack.Text.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;System&quot; /&gt;
    &lt;Reference Include=&quot;System.ComponentModel.DataAnnotations&quot; /&gt;
    &lt;Reference Include=&quot;System.Configuration&quot; /&gt;
    &lt;Reference Include=&quot;System.Core&quot; /&gt;
    &lt;Reference Include=&quot;System.IO, Version=2.6.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Microsoft.Bcl.1.1.10\lib\net40\System.IO.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;System.Management&quot; /&gt;
    &lt;Reference Include=&quot;System.Net&quot; /&gt;
    &lt;Reference Include=&quot;System.Runtime, Version=2.6.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Microsoft.Bcl.1.1.10\lib\net40\System.Runtime.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;System.Threading.Tasks, Version=2.6.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Microsoft.Bcl.1.1.10\lib\net40\System.Threading.Tasks.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;System.Windows.Interactivity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Catel.MVVM.4.2.0\lib\net40\System.Windows.Interactivity.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;System.Xaml&quot; /&gt;
    &lt;Reference Include=&quot;System.Xml.Linq&quot; /&gt;
    &lt;Reference Include=&quot;System.Data.DataSetExtensions&quot; /&gt;
    &lt;Reference Include=&quot;Microsoft.CSharp&quot; /&gt;
    &lt;Reference Include=&quot;System.Data&quot; /&gt;
    &lt;Reference Include=&quot;System.Net.Http&quot; /&gt;
    &lt;Reference Include=&quot;System.Xml&quot; /&gt;
    &lt;Reference Include=&quot;Telerik.Windows.Controls, Version=2015.2.728.40, Culture=neutral, PublicKeyToken=5803cfa389c90ce7, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Telerik.Windows.Controls.for.Wpf.40.Xaml.2015.2.728\lib\net40\Telerik.Windows.Controls.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;Telerik.Windows.Controls.GridView, Version=2015.2.728.40, Culture=neutral, PublicKeyToken=5803cfa389c90ce7, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Telerik.Windows.Controls.GridView.for.Wpf.40.Xaml.2015.2.728\lib\net40\Telerik.Windows.Controls.GridView.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;Telerik.Windows.Controls.Input, Version=2015.2.728.40, Culture=neutral, PublicKeyToken=5803cfa389c90ce7, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Telerik.Windows.Controls.Input.for.Wpf.40.Xaml.2015.2.728\lib\net40\Telerik.Windows.Controls.Input.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;Telerik.Windows.Controls.Navigation, Version=2015.2.728.40, Culture=neutral, PublicKeyToken=5803cfa389c90ce7, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Telerik.Windows.Controls.Navigation.for.Wpf.40.Xaml.2015.2.728\lib\net40\Telerik.Windows.Controls.Navigation.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;Telerik.Windows.Data, Version=2015.2.728.40, Culture=neutral, PublicKeyToken=5803cfa389c90ce7, processorArchitecture=MSIL&quot;&gt;
      &lt;HintPath&gt;..\packages\Telerik.Windows.Data.for.Wpf.40.Xaml.2015.2.728\lib\net40\Telerik.Windows.Data.dll&lt;/HintPath&gt;
      &lt;Private&gt;True&lt;/Private&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;UIAutomationProvider&quot; /&gt;
    &lt;Reference Include=&quot;UIAutomationTypes&quot; /&gt;
    &lt;Reference Include=&quot;WindowsBase&quot; /&gt;
  &lt;/ItemGroup&gt;

Yes I use Nuget, the other 19 points to the same assemblies ...nothing has been moved

# UPDATE #2

Since I was not able to proceed I&#39;ve copied the project from a colleague and now it works.... think something went wrong in the filesystem...have compared the solution and they were identical

  [1]: http://i.stack.imgur.com/BcnyQ.png

Visual studio 2015 project missing all references

### Update
Upgrading to Visual Studio 2019 16.8.X has a new git workflow. This also includes a fetch button.

[![enter image description here][1]][1]

### Summary
I am learning how to use Git with Visual Studio.  I recently did a pull request where the feature branch was deleted after the merge.  The feature branch still shows up in my local and remote branches in Visual Studio.  I know how to right click and delete the branch, this is a workaround as others on the team may complete a pull request on a branch that I have without me knowing it.  If they delete the branch afterwards I would not know they did so.

### Question

How do you refresh Visual Studio branches with what is on Git?

### What I expect

I would expect a button, link, or right click feature that on click checks for differences, if any are found it asks, &quot;This branch no longer exists, would you like to remove it from Visual Studio?&quot;.

### Tech Specs

I am using Visual Studio 2015 Enterprise (still seems to be a symptom of VS 2019 for versions lower than 16.8)

### Additional Example

This could be another question, but it fits so well here.  I just noticed that if I create a branch (say in one VM and look at the same repo with another), Visual Studio does not have a `git fetch` option to update the branch list.  The refresh button at the top does not seem to do anything.  As soon as I run `git fetch` in a bash, visual studio has the new branch.  I would expect the refresh to take care of this.


  [1]: https://i.stack.imgur.com/zj5cq.png

How do I refresh branches (local/remote) in Visual Studio when using Git?

Are there any limits to what types of values can be set using `const` in JavaScript, and in particular, functions? Is this valid? Granted it does work, but is it considered bad practice for any reason?

    const doSomething = () =&gt; {
       ...
    }

Should all functions be defined this way in ES6? It does not seem like this has caught on, if so.



Proper use of const for defining functions

In coffeescript this is straightforward:

    coffee&gt; a = [&#39;a&#39;, &#39;b&#39;, &#39;program&#39;]
    [ &#39;a&#39;, &#39;b&#39;, &#39;program&#39; ]
    coffee&gt; [_..., b] = a
    [ &#39;a&#39;, &#39;b&#39;, &#39;program&#39; ]
    coffee&gt; b
    &#39;program&#39;

Does es6 allow for something similar?

    &gt; const [, b] = [1, 2, 3]                              
    &#39;use strict&#39;                                           
    &gt; b  // it got the second element, not the last one!                      
    2                                                      
    &gt; const [...butLast, last] = [1, 2, 3]          
    SyntaxError: repl: Unexpected token (1:17)                                                                                                                                                        
    &gt; 1 | const [...butLast, last] = [1, 2, 3]                                                                                                                                                        
        |                  ^                                                                                                                                                                          
        at Parser.pp.raise (C:\Users\user\AppData\Roaming\npm\node_modules\babel\node_modules\babel-core\node_modules\babylon\lib\parser\location.js:24:13)                                           

Of course I can do it the es5 way -

    const a = b[b.length - 1]

But maybe this is a bit prone to off by one errors. Can the splat only be the last thing in the destructuring?

Destructuring to get the last element of an array in es6

`new Set([&#39;b&#39;, &#39;a&#39;, &#39;c&#39;]).sort()` throws `TypeError: set.sort is not a function`. How can I sort a `Set` to ensure a particular iteration order?

How can I sort an ES6 `Set`?

So, I&#39;m a javascript programmer and the new version of [JavaScript (ES6)][1] has a new keyword for declaring variables: `let`, next to the old one `var`. 

I know the difference between these two, but I was asking myself: what does `let` stand for? `var` obviously is an abbreviation of *&quot;**var**iable&quot;*, but `let`? Is it an abbreviation as well? Where does it come from?

I googled this and to my amazement, I couldn&#39;t find an answer. I already knew [Swift][2] also has a `let` keyword (they use it for constants), but apparently some other programming languages use it as well.


  [1]: http://www.ecma-international.org/ecma-262/6.0/index.html
  [2]: https://swift.org/

Linguistic meaning of &#39;let&#39; variable in programming

[`Object.freeze()`][1] seems like a transitional convenience method to move towards using `const` in ES6. 

Are there cases where both take their place in the code or is there a preferred way to work with immutable data?

Should I use [`Object.freeze()`][1] until the moment all browsers I work with support `const` then switch to using `const` instead?


  [1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze

Content Type	Original Author	Original Content on Stackoverflow
Question	Jim G.	View Question on Stackoverflow
Solution 1 - Visual Studio	Damian Green	View Answer on Stackoverflow
Solution 2 - Visual Studio	Alexander Kurakin	View Answer on Stackoverflow

How can I configure Resharper's language level for ECMAScript 6?

Visual Studio Problem Overview

Visual Studio Solutions

Solution 1 - Visual Studio

Solution 2 - Visual Studio

Redirect within component Angular 2

Upgrading setuptools on OSX El Capitan

Attributions