A quick test using [Charles Web Proxy][1] shows that source maps are **only** loaded if developer tools are opened.  If you load a page **without** dev tools opened, there is no http request for source maps. 

The behaviour was the same in Chrome 43 and Firefox 38.

So it appears they would be no impact on production environment.


  [1]: http://www.charlesproxy.com/

From HTML5 Rocks:

&gt; Basically it&#39;s a way to map a combined/minified file back to an
&gt; unbuilt state. When you build for production, along with minifying and
&gt; combining your JavaScript files, you generate a source map which holds
&gt; information about your original files. When you query a certain line
&gt; and column number in your generated JavaScript you can do a lookup in
&gt; the source map which returns the original location. Developer tools
&gt; (currently WebKit nightly builds, Google Chrome, or Firefox 23+) can
&gt; parse the source map automatically and make it appear as though you&#39;re
&gt; running unminified and uncombined files.

http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/

I&#39;ve experienced some unexpected behavior of Chrome since the newest version:
While in Firefox this Code is working Perfectly fine:

    &lt;a id=&quot;playlist&quot; class=&quot;button&quot; download=&quot;Name.xspf&quot; href=&quot;data:application/octet-stream;base64,PD94ANDSOON&quot; style=&quot;display: inline;&quot;&gt;Download Me&lt;/a&gt;

It isn&#39;t working in Chrome (Simply downloading a file named &quot;Download&quot;), but has worked pretty fine before. What do I have to change that it is working again?

Chrome Download Attribute not working

STL provides binary search functions std::lower_bound and std::upper_bound,
but I tend not to use them because I&#39;ve been unable to remember what they do,
because their contracts seem completely mystifying to me.

Just from looking at the names,
I&#39;d guess that &quot;lower_bound&quot; might be short for &quot;last lower bound&quot;,&lt;br&gt;
i.e. the last element in the sorted list that is &lt;= the given val (if any).&lt;br&gt;
And similarly I&#39;d guess &quot;upper_bound&quot; might be short for &quot;first upper bound&quot;,&lt;br&gt;
i.e. the first element in the sorted list that is &gt;= the given val (if any).

But the documentation says they do something rather different from that--
something that seems to be a mixture of backwards and random, to me.
To paraphrase the doc:&lt;br&gt;
    - lower_bound finds the first element that&#39;s &gt;= val&lt;br&gt;
    - upper_bound finds the first element that&#39;s &gt; val

So lower_bound doesn&#39;t find a lower bound at all; it finds the first *upper* bound!?
And upper_bound finds the first *strict upper* bound.

Does this make any sense??
How do you remember it?

rationale for std::lower_bound and std::upper_bound?

- Should source-maps be used in production environment? Do they provide any benefits other than debugging?
- Do they impact app load time due to the additional server round-trips? Are browsers smart enough to load `.map` assets after app is loaded and rendered?
- If a browser cannot find the `.map` asset (`404` error), would there be performance impact? Should I care about fixing it?

Note that fixing the last one may not be as easy as serving the `.map` assets if there are complicated concat / minify build steps.

Performance impact of using css / javascript source-maps in production?

<ul>
<li>Should source-maps be used in production environment? Do they provide any benefits other than debugging?</li>
<li>Do they impact app load time due to the additional server round-trips? Are browsers smart enough to load <code>.map</code> assets after app is loaded and rendered?</li>
<li>If a browser cannot find the <code>.map</code> asset (<code>404</code> error), would there be performance impact? Should I care about fixing it?</li>
</ul>
<p>Note that fixing the last one may not be as easy as serving the <code>.map</code> assets if there are complicated concat / minify build steps.</p>


What I have:
-------------

I have jQuery AJAX function that returns HTML after querying a database. Depending on the result of the query, the function will either return HTML code or nothing (i.e. blank) as desired.

What I need:
-------------

I need to conditionally check for when the data is blank.

My code:
-------------

    $.ajax({
    	type:&quot;POST&quot;,
    	url: &quot;&lt;?php echo admin_url(&#39;admin-ajax.php&#39;); ?&gt;&quot;,
    	data: associated_buildsorprojects_form,
    	success:function(data){
    		if(!data){	
    		//if(data=&quot;undefined&quot;){
    		//if(data===&quot;undefined&quot;){
    		//if(data==null){
    		//if(data.length == 0){
    		//if ( data.length != 0 ){
    		//if(data===0){
    		//if(data===&quot;0&quot;){	
    			alert(&quot;Data: &quot; + data);
    		}
    	},
    	error: function(errorThrown){
    		alert(errorThrown);
    		alert(&quot;There is an error with AJAX!&quot;);
    	}  				
    });

My problem:
-------------

I&#39;ve tried a variety of conditions but none correctly check the data. Based on my findings, a blank alert message does not mean data is 

 1. empty
 2. non-existent
 3. equal to zero
 4. of length zero
 5. null
 6. undefined

If it&#39;s none of these things, how can I therefore conditionally check for the data that yields a blank alert message?

Check if AJAX response data is empty/blank/null/undefined/0

I&#39;ve got a function which takes in some arguments. But usage of underscore debounce is :

    var lazyLayout = _.debounce(calculateLayout, 300);

But in my case `calculateLayout` needs some arguments to run. How can I pass them in this case?

**Update :**

Sample `calculateLayout` function :

    var calculateLayout = function(a,b) {
      console.log(&#39;a is &#39; + a + &#39; and b is &#39; + b);
    }



Debounce function with args underscore

I&#39;m trying to use lodash use it at `ng-repeat` directives, in this way:

    &lt;div ng-controller=&quot;GridController&quot; ng-repeat=&quot;n in _.range(5)&quot;&gt;
        &lt;div&gt;Hello {{n}}&lt;/div&gt;
    &lt;/div&gt;

Being `GridController`:

    IndexModule.controller(&#39;GridController&#39;, function () {

	this._ = _

    })

However is not working and so, nothing being *repeated*. If I change the directive to `ng-repeat=&quot;i in [1,2,3,4,5]&quot;` it&#39;ll work.

**`lodash`** is already included via `&lt;script&gt;` at `&lt;header&gt;` before **`angular`**. How can I make it work?

How to make lodash work with Angular JS?

I want to show and hide a `div`, but I want it to be hidden by default and to be able to show and hide it on click. Here is the code that I have made : 

    &lt;a class=&quot;button&quot; onclick=&quot;$(&#39;#target&#39;).toggle();&quot;&gt;
     &lt;i class=&quot;fa fa-level-down&quot;&gt;&lt;/i&gt;
    &lt;/a&gt;

    &lt;div id=&quot;target&quot;&gt; 
     Hello world... 
    &lt;/div&gt;



Hide div by default and show it on click with bootstrap

I found a lot of examples and also tried myself to split a module into several files. So I get that one, very handy. But it&#39;s also practical sometimes to split a class for the same reason. Say I have a couple of methods and I don&#39;t want to cram everything into one long file.

I&#39;m looking for something similar to the **partial** declaration in C#.

How do I split a TypeScript class into multiple files?

I have a a Bootstrap panel with two buttons in the footer:

        &lt;div class=&quot;panel-footer&quot;&gt;
            {{ Form::open( array(&#39;route&#39; =&gt; array(&#39;dogs.edit&#39;, $dog-&gt;id), &#39;method&#39; =&gt; &#39;get&#39;, &quot;class&quot; =&gt; &#39;col-lg-6 &#39;)) }}
                {{ Form::submit(&quot;Edit&quot;, array(&#39;class&#39; =&gt; &#39;btn btn-default&#39;)) }}
            {{ Form::close() }}
            {{ Form::open( array(&#39;route&#39; =&gt; array(&#39;dogs.destroy&#39;, $dog-&gt;id), &#39;method&#39; =&gt; &#39;delete&#39;, &quot;class&quot; =&gt; &#39;col-lg-6 &#39;)) }}
                {{ Form::submit(&quot;Delete&quot;, array(&#39;class&#39; =&gt; &#39;btn btn-default&#39;)) }}
            {{ Form::close() }}
        &lt;/div&gt;

The forms for each of the buttons have the class `pull-left` and `pull-right` so that they are each floated to either side of the panel footer. 

The float is working, but the buttons are now outside of the footer:

![enter image description here][1]

I tried using the grid system instead of the pull helpers but I ended up with the same result. 

I&#39;ve also searched around for the solution (this has to be pretty common I would think) and haven&#39;t found an explanation that doesn&#39;t require overriding Bootstrap with custom css. 

Is it possible to fix this with just Bootstrap or would I need to throw my own css in to fix it?

  [1]: http://i.stack.imgur.com/72ReB.png

Bootstrap: pull left and right in panel footer breaks footer

I want to ignore all `:hover` CSS declarations if a user visits our website via touch device. Because the `:hover` CSS does not make sense, and it can even be disturbing if a tablet triggers it on click/tap because then it might stick until the element loses focus. To be honest, I don&#39;t know why touch devices feel the need to trigger `:hover` in first place - but this is reality, so this problem is reality as well.
```css
a:hover {
  color:blue;
  border-color:green;
  /* etc. &gt; ignore all at once for touch devices */
}
```
**So, (how) can I remove/ignore all CSS `:hover` declarations at once (without having to know each one) for touch devices after having them declared?**


How to remove/ignore :hover css style on touch devices

I want to set a minimum font size to every element in my HTML page.

For example if there are elements with font-size less then 12px, then they will change to 12px.  
But if there are elements with font-size grater then 12px, they will not change.

Is there any way to do it with CSS?

How to set min-font-size in CSS

Without Javascript, I&#39;d like to make a simple looping CSS animation class that fades text in and out, infinitely.  I don&#39;t know a lot about CSS animations, so I haven&#39;t figured it out yet, but here&#39;s how far I&#39;ve gotten:

    @keyframes flickerAnimation { /* flame pulses */
      0%   { opacity:1; }
      50%  { opacity:0; }
      100% { opacity:1; }
    }
    .animate-flicker {
        opacity:1;  
        animation: flickerAnimation 1s infinite;
    }

Simple CSS Animation Loop – Fading In &amp; Out &quot;Loading&quot; Text

I&#39;m trying to run a HTTP Request in Swift, to POST 2 parameters to a URL.

Example:

Link: `www.thisismylink.com/postName.php`

Params:

    id = 13
    name = Jack

What is the simplest way to do that?

I don&#39;t even want to read the response. I just want to send that to perform changes on my database through a PHP file.

HTTP Request in Swift with POST method

Can I somehow do a synchronous HTTP request via `NSURLSession` in Swift?

I can do an asynchronous request via the following code:

    if let url = NSURL(string: &quot;https://2ch.hk/b/threads.json&quot;) {
                let task = NSURLSession.sharedSession().dataTaskWithURL(url) {
                    (data, response, error) in
                    
                    var jsonError: NSError?
                    let jsonDict = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: &amp;jsonError) as [String: AnyObject]
                    if jsonError != nil {
                        return
                    }

                    // ...
                }
                task.resume()
            }

But what about synchronous request?



Can I somehow do a synchronous HTTP request via NSURLSession in Swift

I am using Postman to test some Curl requests to an API server. The API developers gave us the curl command, but I can&#39;t send it from the Postman. How to make such a request from the Postman?

	curl -X POST &quot;https://api-server.com/API/index.php/member/signin&quot; -d &quot;{&quot;description&quot;:&quot;&quot;,&quot;phone&quot;:&quot;&quot;,&quot;lastname&quot;:&quot;&quot;,&quot;app_version&quot;:&quot;2.6.2&quot;,&quot;firstname&quot;:&quot;&quot;,&quot;password&quot;:&quot;my_pass&quot;,&quot;city&quot;:&quot;&quot;,&quot;apikey&quot;:&quot;213&quot;,&quot;lang&quot;:&quot;fr&quot;,&quot;platform&quot;:&quot;1&quot;,&quot;email&quot;:&quot;email@example.com&quot;,&quot;pseudo&quot;:&quot;example&quot;}&quot;

	--0xKhTmLbOuNdArY
	Content-Disposition: form-data; name=&quot;userfile&quot;; filename=&quot;profil.jpg&quot;
	Content-Type: image/jpeg
	Content-Transfer-Encoding: binary

	&lt;ffd8ffe0 00104a46 49460001 01010048 ... a00fffd9&gt;

	—0xKhTmLbOuNdArY—

Simulate a specific CURL in PostMan

I&#39;m getting started with AWS Lambda and I&#39;m trying to request an external service from my handler function. According to [this answer](https://stackoverflow.com/a/27932216/473467), HTTP requests should work just fine, and I haven&#39;t found any documentation that says otherwise. (In fact, people have posted [code that use the Twilio API to send SMS](https://gist.github.com/stevebowman/7cff9dd80b227c899728).)

My handler code is:

    var http = require(&#39;http&#39;);

    exports.handler = function(event, context) {
      console.log(&#39;start request to &#39; + event.url)
      http.get(event.url, function(res) {
        console.log(&quot;Got response: &quot; + res.statusCode);
      }).on(&#39;error&#39;, function(e) {
        console.log(&quot;Got error: &quot; + e.message);
      });

      console.log(&#39;end request to &#39; + event.url)
      context.done(null);
    }

and I see the following 4 lines in my CloudWatch logs:

    2015-02-11 07:38:06 UTC START RequestId: eb19c89d-b1c0-11e4-bceb-d310b88d37e2
    2015-02-11 07:38:06 UTC eb19c89d-b1c0-11e4-bceb-d310b88d37e2 start request to http://www.google.com
    2015-02-11 07:38:06 UTC eb19c89d-b1c0-11e4-bceb-d310b88d37e2 end request to http://www.google.com
    2015-02-11 07:38:06 UTC END RequestId: eb19c89d-b1c0-11e4-bceb-d310b88d37e2

I&#39;d expect another line in there:

    2015-02-11 07:38:06 UTC eb19c89d-b1c0-11e4-bceb-d310b88d37e2 Got response: 302

but that&#39;s missing. If I&#39;m using the essential part without the handler wrapper in node on my local machine, the code works as expected.

The `inputfile.txt` I&#39;m using is for the `invoke-async` call is this:

    {
       &quot;url&quot;:&quot;http://www.google.com&quot;
    }

It seems like the part of the handler code that does the request is skipped entirely. I started out with the [request lib](https://github.com/request/request) and fell back to using plain `http` to create a minimal example. I&#39;ve also tried to request a URL of a service I control to check the logs and there&#39;s no requests coming in.

I&#39;m totally stumped. **Is there any reason Node and/or AWS Lambda would not execute the HTTP request?**

Why is this HTTP request not working on AWS Lambda?

How do I make body optional in REST API calls when using `@RequestBody` annotation in Spring?

With Spring&#39;s latest version, if you use `@RequestBody` annotation, it makes client to send body all the time without making it optional. 

I tried `@RequestBody (required=false)` but that didn&#39;t work &amp; still my request comes as null.

How do I manage to get request converted to proper required object without making body mandatory?

For eg:

    @RequestMapping(value=&quot;/add/employee&quot;, method=RequestMethod.POST)
    public void addEmployee(@RequestBody Employee employee){
        // ...
    }

Here, I want to add employee using POST but without body. How do I do that? Spring latest version throws error &quot;body missing&quot; if I send empty body...


Use @RequestBody with optional body in latest Spring v4

For some reason, I have to run my app in production mode. What is the difference between those modes?

What is the difference between production and development mode in Angular2?

I am considering using Firebase as MBaaS, however I couldn&#39;t find any reliable solution to the following problem:

I would like to set up two separate Firebase environments, one for development and one for production, but I don&#39;t want to do a manual copy of features (eg. remote configuration setup, notification rules, etc.) between the development and production environment.

Is there any tool or method I can rely on? Setting up remote configuration or notification rules from scratch can be a daunting task and too risky.

Any suggestions? Is there a better approach than having two separate environments?

***Before you post another answer to the question which explains how to set up separate Firebase accounts: it is not the question, read it again. The question is: how to TRANSFER changes between separate dev and prod accounts or any better solution than manually copy between them.***

Separate dev and prod Firebase environment

I&#39;m using VueCLI 2 and build as production. THe build.js is built and compiled into 200KB. When I re-run the server as development, it loaded 3MB. I&#39;m sure the build.js inside dist folder is 200KB. I tried to open index.html but it doesn&#39;t work and redirect to root directory on website.



**Package.json**

    &quot;scripts&quot;: {
      &quot;dev&quot;: &quot;cross-env NODE_ENV=development webpack-dev-server --open --hot&quot;,
      &quot;build&quot;: &quot;cross-env NODE_ENV=production webpack --progress --hide-modules&quot;
    },
**Webpack**

    module.exports = { ...
    module:{
     ...
     plugins: [
      new webpack.ProvidePlugin({
        $: &#39;jquery&#39;,
        jquery: &#39;jquery&#39;,
        &#39;window.jQuery&#39;: &#39;jquery&#39;,
        jQuery: &#39;jquery&#39;
      })
     ],
     devtool: &#39;#eval-source-map&#39;
    },
    ...
    }

    if (process.env.NODE_ENV === &#39;production&#39;) {
      module.exports.devtool = &#39;#source-map&#39;
      // http://vue-loader.vuejs.org/en/workflow/production.html
      module.exports.plugins = (module.exports.plugins || []).concat([
       new webpack.DefinePlugin({
        &#39;process.env&#39;: {
         NODE_ENV: &#39;&quot;production&quot;&#39;
       }
      }),
      new webpack.optimize.UglifyJsPlugin({
        sourceMap: true,
        compress: {
         warnings: true
        }
      }),
      new webpack.LoaderOptionsPlugin({
        minimize: true
      }),
      new webpack.optimize.CommonsChunkPlugin({
        name: &#39;vendor&#39;,
        minChunks: function (module) {
          return module.context &amp;&amp; module.context.indexOf(&#39;node_modules&#39;) !== -1;
        }
      })
     ])
    }


**HTML**

    &lt;body&gt;
      &lt;script src=&quot;/dist/vendor.js&quot;&gt;&lt;/script&gt;
      &lt;script src=&quot;/dist/main.js&quot;&gt;&lt;/script&gt;
    &lt;/body&gt;

**Command**

&gt; npm run build
&gt;
&gt; npm run dev


How to run production site after build vue cli

I&#39;m using [UglifyJS][1] to minify and uglify my sources, and [Sentry][2] to report errors from my production environment.

In order to get errors from Sentry, in a readable manner, I need to add source-map 

Is it safe to do it in production servers, or the source-maps files should only exist on staging environment?  
Is there a way to secure them on production environment?

  [1]: https://github.com/mishoo/UglifyJS2
  [2]: https://www.getsentry.com/docs/sourcemaps/

Source maps files in production - Is it safe?

I&#39;m new to webpack, and I need a hand in setting up to generate sourcemaps. I&#39;m running `webpack serve` from the command line, which compiles successfully. But I really need sourcemaps. This is my `webpack.config.js`.


    var webpack = require(&#39;webpack&#39;);

    module.exports = {
    
      output: {
        filename: &#39;main.js&#39;,
        publicPath: &#39;/assets/&#39;
      },
    
      cache: true,
      debug: true,
      devtool: true,
      entry: [
          &#39;webpack/hot/only-dev-server&#39;,
          &#39;./src/components/main.js&#39;
      ],
    
      stats: {
        colors: true,
        reasons: true
      },
    
      resolve: {
        extensions: [&#39;&#39;, &#39;.js&#39;, &#39;.jsx&#39;],
        alias: {
          &#39;styles&#39;: __dirname + &#39;/src/styles&#39;,
          &#39;mixins&#39;: __dirname + &#39;/src/mixins&#39;,
          &#39;components&#39;: __dirname + &#39;/src/components/&#39;,
          &#39;stores&#39;: __dirname + &#39;/src/stores/&#39;,
          &#39;actions&#39;: __dirname + &#39;/src/actions/&#39;
        }
      },
      module: {
        preLoaders: [{
          test: /\.(js|jsx)$/,
          exclude: /node_modules/,
          loader: &#39;jsxhint&#39;
        }],
        loaders: [{
          test: /\.(js|jsx)$/,
          exclude: /node_modules/,
          loader: &#39;react-hot!babel-loader&#39;
        }, {
          test: /\.sass/,
          loader: &#39;style-loader!css-loader!sass-loader?outputStyle=expanded&amp;indentedSyntax&#39;
        }, {
          test: /\.scss/,
          loader: &#39;style-loader!css!sass&#39;
        }, {
          test: /\.(png|jpg|woff|woff2)$/,
          loader: &#39;url-loader?limit=8192&#39;
        }]
      },
    
      plugins: [
        new webpack.HotModuleReplacementPlugin(),
        new webpack.NoErrorsPlugin()
      ]
    
    };

I&#39;m really new to webpack, and looking though the docs hasn&#39;t really helped as I&#39;m not sure what this problem is specific to.

How do I generate sourcemaps when using babel and webpack?

Is there a quick way to switch from the jsx code shown in Chrome DevTools to the raw ES5 and back again?

Disable source maps in Chrome DevTools

My react folder structure is as below

[![enter image description here][1]][1]



   

I&#39;ve not used the create-react-app version. I tried using `GENERATE_SOURCEMAP=false`. But It didn&#39;t work.

Where can I find the .map files. How can I delete those files?

I cannot find a build folder.
I&#39;ve tried using the below script But It cannot work in removing source maps 

     &quot;scripts&quot;: {
    
        &quot;start&quot;: &quot;react-scripts start&quot;,
       &quot;build&quot;: &quot;GENERATE_SOURCEMAP=false &amp;&amp; npm run build&quot;,
        &quot;test&quot;: &quot;react-scripts test --env=jsdom&quot;,
        &quot;eject&quot;: &quot;react-scripts eject&quot;
      },


  [1]: https://i.stack.imgur.com/cH8sj.png

How to disable source maps for React JS Application

### My code

```lang-html
&lt;html&gt;
  &lt;head&gt;
    &lt;!-- Load TensorFlow.js --&gt;
    &lt;script src=&quot;https://cdn.jsdelivr.net/npm/@tensorflow/tfjs&quot;&gt;&lt;/script&gt;
    &lt;!-- Load Posenet --&gt;
    &lt;script src=&quot;https://cdn.jsdelivr.net/npm/@tensorflow-models/posenet&quot;&gt;&lt;/script&gt;
 &lt;/head&gt;

  &lt;body&gt;
    &lt;img id=&#39;cat&#39; src=&#39;./pose/images/aa_085.jpg&#39;/&gt;
  &lt;/body&gt;
  &lt;!-- Place your code in the script tag below. You can also use an external .js file --&gt;
  &lt;script&gt;
    var flipHorizontal = false;

    var imageElement = document.getElementById(&#39;cat&#39;);

    posenet.load().then(function(net) {
      const pose = net.estimateSinglePose(imageElement, {
        flipHorizontal: true
      });
      return pose;
    }).then(function(pose){
      console.log(pose);
    })
  &lt;/script&gt;
&lt;/html&gt;
```

I rarely use HTML and JavaScript and almost forget the most fundamentals. What is the error? 

### Error information

&gt; [DevTools][1] failed to load SourceMap: Could not load content for https://cdn.jsdelivr.net/npm/@tensorflow/tf.min.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

  [1]: https://developers.google.com/web/tools/chrome-devtools/



Content Type	Original Author	Original Content on Stackoverflow
Question	Ray Shan	View Question on Stackoverflow
Solution 1 - Javascript	pnichols	View Answer on Stackoverflow
Solution 2 - Javascript	Jason	View Answer on Stackoverflow

Performance impact of using css / javascript source-maps in production?

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

Solution 2 - Javascript

rationale for std::lower_bound and std::upper_bound?

Chrome Download Attribute not working

Attributions