title: For-loop performance: storing array length in a variable
body: <p>Consider two versions of the same loop iteration:</p>
  
  <pre><code>for (var i = 0; i &lt; nodes.length; i++) {
      ...
  }
  </code></pre>
  
  <p>and</p>
  
  <pre><code>var len = nodes.length;
  for (var i = 0; i &lt; len; i++) {
      ...
  }
  </code></pre>
  
  <p>Is the latter version anyhow faster than the former one?</p>