title: What is the javascript equivalant for vbscript `Is Nothing`
body: <pre><code>If Not (oResponse.selectSingleNode("BigGroupType") Is Nothing) Then
  
  End If
  </code></pre>
  
  <p>I need to convert this to javascript. Is that enough to check <code>null</code>?</p>
  
  <p>This was my lead's answer, plz verify this,</p>
  
  <pre><code>if(typeof $(data).find("BigGroupType").text() !=  "undefined" &amp;&amp; $(data).find("BigGroupType").text() != null) {  
  
  }
  </code></pre>