array iteration

JavaScript performance comparison

Test case created

Preparation code

<script>
  var array = [],
      len;
  for (var i = 0; i < 10000000; i++) array[i] = i;
 
  len = array.length;
  i = 0;
</script>

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Testing in unknown unknown
Test Ops/sec
Without len
for (i = 0; i < array.length; i++) {};
pending…
With len
for (i = 0; i < len; i++) {}
pending…

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