Browser Diet - Cache Array Length

JavaScript performance comparison

Revision 25 of this test case created by aaa

Preparation code

  var arr = new Array(10000000),
      len, i;

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

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