title: Why Google chrome return message as undefined?
body: <p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>var a, b, c;
  alert (typeof a);
  a = 50;
  alert (typeof a);
  b = 30;
  c = a+b;
  console.log(c);</code></pre>
  </div>
  </div>
  </p>
  
  <p><img src="https://i.stack.imgur.com/KxJLo.gif" alt="enter image description here"></p>
  
  <p>I was doing small play with javascript code with google chrome inspect element. And found one issue, all time after declaring variable chrome returning message as undefined.</p>
  
  <p>Can any one help me to understand why it's showing message as undefined?</p>