What does a !! in JavaScript mean?
<blockquote>
  <p><strong>Possible Duplicates:</strong><br>
  <a href="http://stackoverflow.com/questions/3772552/myvar-someothervar">myVar = !!someOtherVar</a><br>
  <a href="http://stackoverflow.com/questions/1406604/what-does-the-operator-double-exclamation-point-mean-in-javascript">What does the !! operator (double exclamation point) mean in JavaScript?</a>  </p>
</blockquote>



<p>Came across this line of code</p>

<pre><code>strict = !!argStrict
</code></pre>

<p>... <a href="http://github.com/kvz/phpjs/raw/master/functions/array/in_array.js" rel="nofollow">here</a> and wondered what effect the <code>!!</code> has on the line? Pretty new to JS!</p>
