How to check for undefined in javascript?
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/3390396/best-way-to-check-for-undefined-in-javascript">Best way to check for “undefined” in JavaScript?</a>  </p>
</blockquote>



<p>I want to make an if statement that if the value is not defined then let it go through.</p>

<p>I tried</p>

<pre><code>if (something != "undefined")
</code></pre>

<p>and </p>

<pre><code>if (something !== "undefined")
</code></pre>

<p>However it seems to go into the <code>if</code> statement no matter what. If it is undefined it goes through. If it is defined it goes through. Am I doing something wrong?</p>
