for-vs-length

JavaScript performance comparison

Test case created by

Preparation code

<script>
  var array = new Array();
  for (var i = 0; i < 1000; i++) {
    array.push(i);
  }
</script>
    

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Normal Loop
var dummy = 0;
for (var i = 0; i < array.length; i++) {
  dummy += array[i];
}
pending…
Optimized Loop
var dummy = 0;
for (var i = 0, al = array.length; i < al; i++) {
  dummy += array[i];
}
pending…

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