Loop test

JavaScript performance comparison

Revision 4 of this test case created

Preparation code

<script>
  var initialLength = 10000,
      items = new Array(initialLength);
  while (initialLength--) {
   items[initialLength] = true;
  }
</script>

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Testing in unknown unknown
Test Ops/sec
while
var i = items.length;
while (--i) {

}
pending…
for
for (var i = 0, len = items.length; i < len; i++) {

}
pending…
foreach for
for (var i in items) {

}
pending…

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