title: What does it mean if console.log(4) outputs undefined in Chrome Console?
body: <p>I used the Chrome Console to write a simple statement: </p>
  
  <pre><code>console.log(4)
  </code></pre>
  
  <p>and received the 
  Output:</p>
  
  <pre><code>4
  </code></pre>
  
  <p><code>undefined</code></p>
  
  <p>What does the undefined statement mean?
  Does the undefined statement imply correct execution? If I execute the statement via a separate html file and then look at the console, the output is just 4.</p>