nextSibling vs childNodes (v8)

Revision 8 of this benchmark created by Sam3000 on

Description

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

Preparation HTML

<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>

Setup

var xnodes = [].slice.call(container.childNodes);

Test runner

Ready to run.

Testing in
TestOps/sec
childNodes
var len = container.childNodes.length,
    i;
for (i = 0; i < len; i++) {
 process(container.childNodes[i]);
}
ready
childNodes, cached
var nodes = container.childNodes,
    len = nodes.length,
    i;
for (i = 0; i < len; i++) {
 process(nodes[i]);
}
ready
nextSibling
var node = container.firstChild;
while (node) {
 process(node);
 node = node.nextSibling;
}
ready
cache childNodes in array
var nodes = [].slice.call(container.childNodes),
    len = nodes.length,
    i;
for (i = 0; i < len; i++) {
 process(nodes[i]);
}
 
ready
childNodes in array outside loop
var len = xnodes.length, i;
for (i=0; i<len; i++) {
   process(xnodes[i]);
}
ready

Revisions

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