title: Chrome dev console outputting undefined
body: <p>Every time i see some javascript code on a website, I feel like typing and trying it out on the Chrome's developer's tool console instead of creating a javascript file and then opening it separately in the browser. </p>
  
  <p>Like today, I was viewing Doug Crockford's Js lecture and kept simultaneously running test on whatever he was saying to cross check that feature.</p>
  
  <p>A strange thing that I noticed in the javascript console is that it always outputs the value undefined as a result of any statement that I execute that does not produce a fixed value as below:</p>
  
  <blockquote>
    <p>var x = 12;
    Console o/p &lt; undefined</p>
    
    <p>2+3
    Console o/p &lt; 5</p>
    
    <p>+"46"
    &lt; 46</p>
  </blockquote>
  
  <p>What does the undefined value mean which Chrome dev console after every declaration.</p>