If you are always dealing with the time in `h:mma` format, you can specify it when parsing...

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-js --&gt;

    var beginningTime = moment(&#39;8:45am&#39;, &#39;h:mma&#39;);
    var endTime = moment(&#39;9:00am&#39;, &#39;h:mma&#39;);
    console.log(beginningTime.isBefore(endTime)); // true
    console.log(beginningTime.toDate()); // Mon May 12 2014 08:45:00
    console.log(endTime.toDate()); // Mon May 12 2014 09:00:00

&lt;!-- language: lang-html --&gt;

    &lt;script src=&quot;https://cdn.jsdelivr.net/momentjs/2.13.0/moment.min.js&quot;&gt;&lt;/script&gt;

&lt;!-- end snippet --&gt;

It will use today as the date, so it won&#39;t work if you are spanning different days.

[**JSFiddle**][1]


  [1]: http://jsfiddle.net/aSc4R/

As per documentation you are declaring moment variable incorrectly check allowed formates 

http://momentjs.com/docs/#/parsing/string/


Instead of it you can use

    

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-js --&gt;

    var beginningTime = moment({
      h: 8,
      s: 45
    });
    var endTime = moment({
      h: 9,
      s: 0
    });
    console.log(beginningTime.isBefore(endTime)); //true

&lt;!-- language: lang-html --&gt;

    &lt;script src=&quot;https://cdn.jsdelivr.net/momentjs/2.13.0/moment.min.js&quot;&gt;&lt;/script&gt;

&lt;!-- end snippet --&gt;



`8:45am` and `9:00am` are invalid dates

    var beginningTime = moment(&#39;8:45am&#39;);
    var endTime = moment(&#39;9:00am&#39;);
    console.log(beginningTime.isValid(), endTime.isValid()) // FALSE

You should use a valid format: http://momentjs.com/docs/#/parsing/string/

And they suggest that for consistent results, should use http://momentjs.com/docs/#/parsing/string-format/

Eg. 

    moment(&quot;2010-10-20 4:30&quot;, &quot;YYYY-MM-DD HH:mm&quot;); // parsed as 4:30 local time


You should just open the console and try doing this manually: moment(&quot;8:45am&quot;).toDate() 

It gives you Invalid Date, which is why you&#39;re not getting expected results. Whereas &quot;2014-05-15 08:45&quot; gives you a date.

When I try to declare a struct inside of another struct:

```
struct Test {
    struct Foo {}
}
```

The compiler complains: 

```none
error: expected identifier, found keyword `struct`
 --&gt; src/lib.rs:2:5
  |
2 |     struct Foo {}
  |     ^^^^^^ expected identifier, found keyword
help: you can escape reserved keywords to use them as identifiers
  |
2 |     r#struct Foo {}
  |     ^^^^^^^^

error: expected `:`, found `Foo`
 --&gt; src/lib.rs:2:12
  |
2 |     struct Foo {}
  |            ^^^ expected `:`
```

I could not find any documentation in either direction; are nested structs even supported in Rust?

Are nested structs supported in Rust?

I am trying to make the status bar for one of my view controllers to be hidden (when displayed modally). When I&#39;m presenting the view controller, the status bar is is to be hidden and then returned when dismissed.

I have added the following code to the presented view controller

    - (BOOL)prefersStatusBarHidden
    {
        return YES;
    }

I have also set the keys in the Info.plist file to the following:

    &lt;key&gt;UIViewControllerBasedStatusBarAppearance&lt;/key&gt;
    &lt;true/&gt;

From my understanding this should be all that is required to make this work. 

I am also using a custom Animation Controller to do the presenting which conforms to the `UIViewControllerAnimatedTransitioning` protocol. In the `animateTransition:` implementation I have tried to manually call `prefersStatusBarHidden`, followed by `setNeedsStatusBarAppearanceUpdate` to ensure the call is being made, but the status bar remains.

Any ideas why this is happening would be appreciated. I have searched StackOverflow, but it appears no one has had this issue, all accepted answers refer to calling `setNeedsStatusBarAppearanceUpdate`, which I am already doing.

**EDIT** - The code below now seems to ***WORK*** as desired 

    - (void)animateTransition:(id &lt;UIViewControllerContextTransitioning&gt;)transitionContext
    {
        if (self.isPresenting) {
            UIView *containerView = [transitionContext containerView];
    
            UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
            UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    
            toViewController.view.frame = containerView.frame;
    
            [containerView addSubview:toViewController.view];

            // Ask the presented controller whether to display the status bar
            [toViewController setNeedsStatusBarAppearanceUpdate];
    
            [UIView animateWithDuration:1.0f delay:0.0f options:UIViewAnimationOptionCurveEaseIn animations:^{
                toViewController.view.alpha = 1.0f;
                fromViewController.view.alpha = 0.0f;
            } completion:^(BOOL finished) {
                [transitionContext completeTransition:YES];
            }];
        }
        else {
            // do the reverse
            UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
            UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    
            [UIView animateWithDuration:1.0f delay:0.0f options:UIViewAnimationOptionCurveEaseIn animations:^{
                toViewController.view.alpha = 1.0f;
                fromViewController.view.alpha = 0.0f;
            } completion:^(BOOL finished) {
                [transitionContext completeTransition:YES];
                // Once dismissed - ask the presenting controller if the status bar should be presented
                [toViewController setNeedsStatusBarAppearanceUpdate];
            }];
        }
    }

    ....

    // PresentingController.m
    - (BOOL)prefersStatusBarHidden
    {
        if (self.presentedViewController) {
            return YES;
        }
        return NO;
    }

    // PresentedController.m
    - (BOOL)prefersStatusBarHidden
    {
        return YES;
    }


UIViewController&#39;s prefersStatusBarHidden not working

I have a problem that requires me to take two times in 12 hour format and compare them, we have moment.js included in our project and we initially thought it would be as trivial as this:

    var beginningTime = moment(&#39;8:45am&#39;);
    var endTime = moment(&#39;9:00am&#39;);
    console.log(beginningTime.isBefore(endTime)); //false???

**Fiddle:** http://jsfiddle.net/KyleMuir/M4R4z/

Is there something we are missing? It feels like this shouldn&#39;t be a hard problem to solve. When we perform any moment functions on our `beginningTime` or `endTime` it simply says `NAN`

Comparing two times with Moment JS

I have a problem that requires me to take two times in 12 hour format and compare them, we have moment.js included in our project and we initially thought it would be as trivial as this:
<pre><code class="hljs language-ini">var beginningTime = moment('8:45am');
var endTime = moment('9:00am');
console.log(beginningTime.isBefore(endTime)); //false???
</code></pre>
Fiddle: <a href="http://jsfiddle.net/KyleMuir/M4R4z/" target="_blank" rel="noopener noreferrer">http://jsfiddle.net/KyleMuir/M4R4z/</a>
Is there something we are missing? It feels like this shouldn't be a hard problem to solve. When we perform any moment functions on our <code>beginningTime</code> or <code>endTime</code> it simply says <code>NAN</code>

I am attempting to create a thumbnail preview from a video file (mp4,3gp) from a form `input type=&#39;file&#39;`.  Many have said that this can be done server side only.  I find this hard to believe since I just recently came across this Fiddle using HTML5 Canvas and Javascript.

[**Thumbnail Fiddle**][1]


  [1]: http://jsfiddle.net/vphyr/

The only problem is this requires the video to be present and the user to click play before they click a button to capture the thumbnail.  I am wondering if there is a way to get the same results without the player being present and user clicking the button.  For example: User click on file upload and selects video file and then thumbnail is generated. Any help/thoughts are welcome!  

Create thumbnail from video file via file input

Provided an HTML element of type `div`, how to set the value of its `id` attribute, which is the concatenation of a scope variable and a string ? 

How to set the id attribute of a HTML element dynamically with angularjs (1.x)?

Given the following examples, why is `outerScopeVar` undefined in all cases?

    var outerScopeVar;

    var img = document.createElement(&#39;img&#39;);
    img.onload = function() {
        outerScopeVar = this.width;
    };
    img.src = &#39;lolcat.png&#39;;
    alert(outerScopeVar);

&lt;!--&gt;

    var outerScopeVar;
    setTimeout(function() {
        outerScopeVar = &#39;Hello Asynchronous World!&#39;;
    }, 0);
    alert(outerScopeVar);

&lt;!--&gt;

    // Example using some jQuery
    var outerScopeVar;
    $.post(&#39;loldog&#39;, function(response) {
        outerScopeVar = response;
    });
    alert(outerScopeVar);

&lt;!--&gt;


    // Node.js example
    var outerScopeVar;
    fs.readFile(&#39;./catdog.html&#39;, function(err, data) {
        outerScopeVar = data;
    });
    console.log(outerScopeVar);

&lt;!--&gt;

    // with promises
    var outerScopeVar;
    myPromise.then(function (response) {
        outerScopeVar = response;
    });
    console.log(outerScopeVar);

&lt;!--&gt;

    // geolocation API
    var outerScopeVar;
    navigator.geolocation.getCurrentPosition(function (pos) {
        outerScopeVar = pos;
    });
    console.log(outerScopeVar);

Why does it output `undefined` in all of these examples? I don&#39;t want workarounds, I want to know **why** this is happening.

&lt;hr&gt;

&gt; **Note:** This is a canonical question for *JavaScript asynchronicity*. Feel free to improve this question and add more simplified examples which the community can identify with.

Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference

I&#39;d like to use WebSockets for inter-process communication for my application (Daemon&lt;-&gt;WebGUI and Daemon&lt;-&gt;FatClient, etc.). During testing, I tried connecting to my locally running web socket server (ws://localhost:1234) via the JavaScript WebSocket client on websocket.org (http://www.websocket.org/echo.html).

My question now is:   
**Why is this possible?** Is there no cross-origin policy implemented in the browsers (here: FF29 on Linux)? 

I am asking because if websocket.org was evil, it could try to communicate with my local WS server and redirect every message it receives from localhost to any other server:

&lt;pre&gt;
Local WebSocket Server            Browser            Evil Web Server
at ws://localhost:1234                               at http://evil.tld
        |                            |                       |
        |                            |------[GET /]---------&amp;gt;|
        |                            |&amp;lt;-----[HTML+EvilJS]----|
        |&amp;lt;------[connect ws://..]----|                       |
        |&amp;lt;----[some communication]--&amp;gt;|                       |
        |                            |----[evil forward]----&amp;gt;|
        |                            |                       |
&lt;/pre&gt;

I have not tested the entire use case, but the connect to ws://localhost from the JS delivered by websocket.org definitely works.

Why is there no same-origin policy for WebSockets? Why can I connect to ws://localhost?

Is it possible to directly convert canvas to pdf using JavaScript ([`pdf.js`][1] or something like that)?

Is there another possible way like canvas to img and then img to pdf?

Can you give me an example?


  [1]: https://mozilla.github.io/pdf.js

Convert canvas to PDF

I have two [moment][1] dates:

    var fromDate = moment(new Date(&#39;1/1/2014&#39;));
    var toDate   = moment(new Date(&#39;6/1/2014&#39;));

Does moment provide a way to enumerate all of the dates between these two dates? 

If not, is there any better solution other than to make a loop which increments the `fromDate` by 1 until it reaches the `toDate`?

  [1]: http://momentjs.com/docs/

**Edit: Adding date enumeration method and problem**

I&#39;ve mocked up a method for enumerating the days between two dates, but I&#39;m running into an issue. 

      var enumerateDaysBetweenDates = function(startDate, endDate) {
        var dates = [];

        startDate = startDate.add(1, &#39;days&#39;);

        while(startDate.format(&#39;M/D/YYYY&#39;) !== endDate.format(&#39;M/D/YYYY&#39;)) {
          console.log(startDate.toDate());
          dates.push(startDate.toDate());
          startDate = startDate.add(1, &#39;days&#39;);
        }

        return dates;
      };

Take a look at the output when I run `enumerateDaysBetweenDates( moment(new Date(&#39;1/1/2014&#39;)), moment(new Date(&#39;1/5/2014&#39;));`

    Thu Jan 02 2014 00:00:00 GMT-0800 (PST)
    Fri Jan 03 2014 00:00:00 GMT-0800 (PST)
    Sat Jan 04 2014 00:00:00 GMT-0800 (PST)
    [ Sun Jan 05 2014 00:00:00 GMT-0800 (PST),
      Sun Jan 05 2014 00:00:00 GMT-0800 (PST),
      Sun Jan 05 2014 00:00:00 GMT-0800 (PST) ]

It&#39;s console.logging the right dates, but only the final date is being added to the array. How/why is this? This smells like some sort of variable reference issue - but I&#39;m not seeing it.

How to enumerate dates between two dates in Moment

`2014-07-28` 



How do I find the `month`, `year` and `day` with `moment.js` given the date format above?

    var check = moment(n.entry.date_entered).format(&quot;YYYY/MM/DD&quot;);
    var month = check.getUTCMonth();
    var day = check.entry.date_entered.getUTCDate();
    var year = check.entry.date_entered.getUTCFullYear();


 
                    

How to find the day, month and year with moment.js

What is the difference between those two:

    var year = moment().format(&#39;YYYY&#39;);
    var year = moment().year();

Is it just type of a returned value or anything else?

What is difference between &#39;year()&#39; and &#39;format(&#39;YYYY&#39;)&#39;?

I&#39;m able to get the difference between two dates using MomentJs as follows:

    moment(end.diff(startTime)).format(&quot;m[m] s[s]&quot;)


However, I also want to display the hour when applicable (only when &gt;= 60 minutes have passed).

However, when I try to retrieve the duration hours using the following:

    var duration = moment.duration(end.diff(startTime));
    var hours = duration.hours();

it is returning the current hour and not the number of hours between the two dates. 

How do I get the difference in hours between two Moments? 




Get hours difference between two dates in Moment Js

I was trying to round the moment.js time object to next nearest 30 minute interval. But looks my logic us wrong.

Ex:

    10:13am -&gt; 10:30am
    11:45am -&gt; 12:00pm

Here is my current code

    start = moment();
    minuteReminder = start.minute() % 30;
    start.add(minuteReminder, &#39;minutes&#39;);
    start.format(&quot;D YYYY, h:mm:ss a&quot;);
    



Content Type	Original Author	Original Content on Stackoverflow
Question	Kyle Muir	View Question on Stackoverflow
Solution 1 - Javascript	Anthony Chu	View Answer on Stackoverflow
Solution 2 - Javascript	Mudaser Ali	View Answer on Stackoverflow
Solution 3 - Javascript	Amy	View Answer on Stackoverflow
Solution 4 - Javascript	Damon Smith	View Answer on Stackoverflow

Comparing two times with Moment JS

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

Solution 2 - Javascript

Solution 3 - Javascript

Solution 4 - Javascript

UIViewController's prefersStatusBarHidden not working

Are nested structs supported in Rust?

Attributions