title: what does the '[0]' mean with $('#div')[0]?
body: <p>What does the [0] mean?  Also is there a reference/manual that i can use to prevent asking simple questions like this..</p>
  
  <pre><code>    var height = $('.string-parent-container')[0].scrollHeight;
  $('.string-parent-container').scrollTop(height);
  </code></pre>