Live vs Static NodeList Iteration

JavaScript performance comparison

Revision 25 of this test case created by

Preparation code

<ul>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
  <li><a href="#">Item</a></li>
</ul>
      
<script>
Benchmark.prototype.setup = function() {
  var liveList = document.getElementsByTagName("a");
  var staticList = document.querySelectorAll("a");
  

};
</script>

Preparation code output

<ul> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> <li><a href="#">Item</a></li> </ul>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Using querySelectorAll()
for (var results = [], i = staticList.length; i--;) results[i] = staticList[i];
pending…
Using getElementsByTagName()
for (var results = [], i = liveList.length; i--;) results[i] = liveList[i];
pending…

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Revisions

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