Fastest array loops in Javascript

JavaScript performance comparison

Revision 413 of this test case created by Peter Wong

Preparation code

<script>
  // Populate the base array
  var arr = [];
  for (var i = 0; i < 1000; i++) {
    arr[i] = i;
  }

  function someFn(ix) {
    return ix * 5 + 1 / 3 * 8;
  }
</script>
    

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
For loop, basic
var sum1 = 0;
var length1 = arr.length;
for (var i1 = 0; i1 < length1; i1++) {
  sum1 += someFn(arr[i1]);
}
pending…
While length--
var i2 = arr.length;
var sum2 = 0;
while(i2--) {
  sum2 += someFn(arr[i2]);
}
pending…

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Revisions

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