title: typeof typeof x returns string and not object since type of null is object
body: <p>I am new to <code>js</code>, trying to learn <code>js</code>, can you guys tell me why <code>typeof typeof x</code> returns <code>string</code>, providing code snippet below, if i understand this simple concept it will help me more:</p>
  
  <pre><code>var x=null;
  console.log(typeof typeof x);
  </code></pre>