Browser Diet - Cache Array Length

JavaScript performance comparison

Revision 18 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var arr = new Array(1000);
};
</script>

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Testing in unknown unknown
Test Ops/sec
Without cache
for (var i = 0; i < arr.length; i++) {
  // do something
}
pending…
With cache
for (var i = 0, len = arr.length; i < len; i++) {
  // do something
}
pending…
Length defined outside of loop
var i = 0,
    len = arr.length;
for (i; i < len; i++) {
  // do something
}
pending…
Go reversely
for (var i = arr.length - 1; i >= 0; --i) {
  // do something
}
pending…

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