title: Hidden Features of JavaScript?
body: <p><strong>What "Hidden Features" of JavaScript do you think every programmer should know?</strong></p>
  
  <p>After having seen the excellent quality of the answers to the following questions I thought it was time to ask it for JavaScript.</p>
  
  <ul>
  <li><a href="https://stackoverflow.com/questions/954327/">Hidden Features of HTML</a></li>
  <li><a href="https://stackoverflow.com/questions/628407">Hidden Features of CSS</a></li>
  <li><a href="https://stackoverflow.com/questions/61401/">Hidden Features of PHP</a></li>
  <li><a href="https://stackoverflow.com/questions/54929/">Hidden Features of ASP.NET</a></li>
  <li><a href="https://stackoverflow.com/questions/9033/">Hidden Features of C#</a></li>
  <li><a href="https://stackoverflow.com/questions/15496/">Hidden Features of Java</a></li>
  <li><a href="https://stackoverflow.com/questions/101268/">Hidden Features of Python</a></li>
  </ul>
  
  <p>Even though JavaScript is arguably the most important Client Side language right now (just ask Google) it's surprising how little most web developers appreciate how powerful it really is.</p>