title: Using underscore.js for null checking
body: <pre><code>var name = "someName";
  if(name !=null) {
     // do something
  }
  </code></pre>
  
  <ol>
  <li>I am right now using <a href="http://underscorejs.org/#isNull" rel="noreferrer">http://underscorejs.org/#isNull</a>, how would i do
  the same using <code>underscore.js</code></li>
  <li>Does it give any slight improvement in terms of performance for such
  functions.</li>
  </ol>