What for need add ! before function?
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/3755606/what-does-the-exclamation-mark-do-before-the-function">What does the exclamation mark do before the function?</a>  </p>
</blockquote>



<p>What for need add ! before function?</p>

<pre><code>!function(){
}();
</code></pre>

<p>I saw earlier like, but "!" never</p>

<pre><code>;function(){
}();
</code></pre>
