title: What's the best way to loop through a set of elements in JavaScript?
body: <p>In the past and with most my current projects I tend to use a for loop like this:</p>
  
  <pre><code>var elements = document.getElementsByTagName('div');
  for (var i=0; i&lt;elements.length; i++) {
      doSomething(elements[i]);
  }
  </code></pre>
  
  <p>I've heard that using a "reverse while" loop is quicker but I have no real way to confirm this:</p>
  
  <pre><code>var elements = document.getElementsByTagName('div'), 
      length = elements.length;
  
  while(length--) {
      doSomething(elements[length]);
  }
  </code></pre>
  
  <p>What is considered as best practice when it comes to looping though elements in JavaScript, or any array for that matter?</p>