array-foreach

JavaScript performance comparison

Revision 2 of this test case created by Jason Mulligan

Preparation code

<script>
  var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Normal loop
for (var i = 0; i < a.length; i++) var item = a[i];
pending…
Cached length
for (var i = 0, l = a.length; i < l; i++) var item = a[i];
pending…
forEach
a.forEach(function(item) {});
pending…
Backwards
for (var i = a.length; i--;) var item = a[i];
pending…
Tricky
for (var item, i = 0;
(item = a[i]) !== undefined; i++) {}
pending…
while
var i = -1, nth = a.length, item;

while (++i < nth) {
  item = a[i];
}
pending…

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Revisions

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