Browser Diet - Cache Array Length

JavaScript performance comparison

Revision 26 of this test case created

Preparation code

<script>

</script>
<script>
Benchmark.prototype.setup = function() {
      var arr = new Array(10000000),
          len, i;
};
</script>

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Testing in unknown unknown
Test Ops/sec
Without cache
for (i = 0; i < arr.length; i++) {
  // do something
}
pending…
With cache
for (i = 0, len = arr.length; i < len; i++) {
  // do something
}
pending…
Real with cache
len = arr.length;
for (i = 0; i < len; i++) {
  // do something
}
pending…

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