nextSibling vs childNodes

JavaScript performance comparison

Revision 15 of this test case created by Yanis Benson

Info

Test the relative performance of iterating through child nodes using nextSibling vs iterating through the childNodes array.

Preparation code

<div id="container">
</div>
<script>
  var container = document.getElementById('container');
  var s = "";
  for (var i=0; i<100; ++i) s+="<p>Child</p>";
  container.innerHTML = s;
 
  function process(element) {}
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
childNodes
var len = container.childNodes.length,
    i;
for (i = len; i >= 0; i--) {
 process(container.childNodes[i]);
}
pending…
childNodes, cached, reversed
var nodes = container.childNodes,
    len = nodes.length,
    i;
for (i = len; i--; ) {
 process(nodes[i]);
}
pending…
nextSibling
var node = container.firstChild;
while (node != null) {
 process(node);
 node = node.nextSibling;
}
pending…
previousSibling
var node = container.lastChild;
while (node != null) {
 process(node);
 node = node.previousSibling;
}
pending…

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