The ! is the boolean NOT operator. 

NOT (!): toggles a statement from true to false or from false to true. 

    !0 = true
    !1 = false

[This][1] is a brilliant introduction to boolean operators and their use in javascript.


  [1]: http://www.quirksmode.org/js/boolean.html

I&#39;m looking for a better way to do

    if hash.key? :a &amp;&amp;
       hash.key? :b &amp;&amp;
       hash.key? :c &amp;&amp;
       hash.key? :d

preferably something like

    hash.includes_keys? [ :a, :b, :c, :d ] 


I came up with 

    hash.keys &amp; [:a, :b, :c, :d] == [:a, :b, :c, :d]

but I dont like having to add the array twice though

Check if a hash&#39;s keys include all of a set of keys

I am writing a script to monitor the CPU and MEM of any given process. For that i need to send in the name of the process to be monitored as a commandline argument. For example. 

    ./monitorscript &lt;pname&gt;

I need to get the pid of the process in the script so that i can use a `ps -p &lt;pid&gt;` inside. 

How do i get the pid of a process given its process name? 

I understand that there might be multiple processes in the same name. I just want to get the first process out of that list. 



How to get the PID of a process by giving the process name in Mac OS X ?

&gt; **Possible Duplicate:**  
&gt; [return !1 in javascript](https://stackoverflow.com/questions/8255653/return-1-in-javascript)  

&lt;!-- End of automatically inserted text --&gt;

In a JavaScript file I had to read today, there was a line where a variable was declared like a factorial, like this :

    var myVariable = !1;

and then something similar was used as parameter in a function like this :

    return variable.myFunction(!0);

Can anyone explain me what the exclamation mark means in this context and eventually, why this is generally used for (benefits) ?

Thank you in advance !

What does !1 and !0 mean in Javascript?

> Possible Duplicate: 
> <a href="https://stackoverflow.com/questions/8255653/return-1-in-javascript" target="_blank" rel="noopener noreferrer">return !1 in javascript</a>

In a JavaScript file I had to read today, there was a line where a variable was declared like a factorial, like this :
<pre><code class="hljs language-ini">var myVariable = !1;
</code></pre>
and then something similar was used as parameter in a function like this :
<pre><code class="hljs language-kotlin">return variable.myFunction(!0);
</code></pre>
Can anyone explain me what the exclamation mark means in this context and eventually, why this is generally used for (benefits) ?
Thank you in advance !

I want to write a program that:

* 80% of the time will say `sendMessage(&quot;hi&quot;);`
* 5% of the time will say `sendMessage(&quot;bye&quot;);`
* and 15% of the time will say `sendMessage(&quot;Test&quot;);`

Does it have to do something with `Math.random()`?
like 

&lt;!-- language: js --&gt;

    if (Math.random() * 100 &lt; 80) {
      sendMessage(&quot;hi&quot;);
    }
    else if (Math.random() * 100 &lt; 5) {
      sendMessage(&quot;bye&quot;);
    }

Percentage chance of saying something?

Is there a way to easily reset all sinon spys mocks and stubs that will work cleanly with mocha&#39;s beforeEach blocks.

I see sandboxing is an option but I do not see how you can use a sandbox for this

    beforeEach -&gt;
      sinon.stub some, &#39;method&#39;
      sinon.stub some, &#39;mother&#39;
    
    afterEach -&gt;
      # I want to avoid these lines
      some.method.restore()
      some.other.restore()
    
    it &#39;should call a some method and not other&#39;, -&gt;
      some.method()
      assert.called some.method

Cleaning up sinon stubs easily

I&#39;m trying to inject my CSS from JavaScript which is injected as content script:

    &quot;content_scripts&quot;: [
       {
          &quot;matches&quot;: [&quot;http://www.google.com/*&quot;],
          &quot;js&quot;: [&quot;script.js&quot;]
       }
    ],

I found [similar question][1] about injecting CSS, but I encountered a problem while using code from [accepted answer][2]. Here&#39;s my `script.js` contents:

    var link = document.createElement(&quot;link&quot;);
    link.href = chrome.extension.getURL(&quot;style.css&quot;);
    link.type = &quot;text/css&quot;;
    link.rel = &quot;stylesheet&quot;;
    document.getElementsByTagName(&quot;head&quot;)[0].appendChild(link);

After I load some page this message appears in console:

&gt; Denying load of
&gt; chrome-extension://phkgaaiaakklogbhkdnpjncedlbamani/fix.css. Resources
&gt; must be listed in the web_accessible_resources manifest key in order
&gt; to be loaded by pages outside the extension.

Is there any way to fix this? Or, maybe, some other way to inject a CSS from that JavaScript file?

Note: I can&#39;t include style sheet directly from manifest.

  [1]: https://stackoverflow.com/questions/9345003/can-i-inject-a-css-file-programmatically-using-a-content-script-js-file
  [2]: https://stackoverflow.com/a/9345038/272770

How to inject CSS using content script file in Chrome extension?

I constantly find myself using this idiom in KO-based HTML templates:

&lt;!-- language-all: lang-html --&gt;

    &lt;!-- ko if: isEdit --&gt;
    &lt;td&gt;&lt;input type=&quot;text&quot; name=&quot;email&quot; data-bind=&quot;value: email&quot; /&gt;&lt;/td&gt;
    &lt;!-- /ko --&gt;
    &lt;!-- ko ifnot: isEdit --&gt;
    &lt;td data-bind=&quot;text: email&quot;&gt;&lt;/td&gt;
    &lt;!-- /ko --&gt;

Is there a better/cleaner way to do conditionals in KO, or is there a better *approach* than just using traditional if-else constructs?

Also, I would just like to point out that some versions of Internet Explorer (IE 8/9) don&#39;t parse the above example correctly. Please see [this SO question][1] for more information. The quick summary is, don&#39;t use comments (virtual bindings) inside table tags to support IE. Use the `tbody` instead:

    &lt;tbody data-bind=&quot;if: display&quot;&gt;&lt;tr&gt;&lt;td&gt;hello&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;


  [1]: https://stackoverflow.com/questions/12613668/knockout-virtual-elements-between-tr-tags-in-ie-browsers

How to template If-Else structures in data-bound views?

Maybe it&#39;s late, or maybe it&#39;s the sake, but I just read the docs for [ArrayBuffer][1] and can&#39;t think of a single thing it would be really useful for.

Can someone enlighten me?

Are there any uses anyone can think of that don&#39;t involve images?


  [1]: https://developer.mozilla.org/en/JavaScript_typed_arrays/ArrayBuffer

Content Type	Original Author	Original Content on Stackoverflow
Question	m_vdbeek	View Question on Stackoverflow
Solution 1 - Javascript	Anirudh Ramanathan	View Answer on Stackoverflow

What does !1 and !0 mean in Javascript?

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

How to get the PID of a process by giving the process name in Mac OS X ?

Check if a hash's keys include all of a set of keys

Attributions