array indexing performance

JavaScript performance comparison

Test case created

Preparation code

<script>
  var ar = [1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 4, 5, 6, 7, 8, 9];
</script>

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Testing in unknown unknown
Test Ops/sec
for-in
var total = 0;
for (var i in ar) total += ar[i];
pending…
index
var total = 0;
var l = ar.length;
for (var i = 0; i < l; i++) total += ar[i];
pending…

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