For loops

JavaScript performance comparison

Test case created by Sam

Info

Testing object iteration speed

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var list = [1, 2, 3, 4, 5, 6, 7, 8, 9];
};
</script>

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Testing in unknown unknown
Test Ops/sec
Regular
for (var i = 0, max = list.length, l; i < max; i++) {
  l = list[i];
}
pending…
Reverse
for (var i = list.length - 1, l; i > 0; i--) {
  l = list[i];
}
pending…
Item check
for (var i = 0, l;
(l = list[i]) != null; i++) {}
pending…

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