Loop iteration (length comparison variations)

JavaScript performance comparison

Revision 14 of this test case created by Curtis

Info

Comparison of different ways to treat the length of an array when iterating the array.

Preparation code

<script>
  var list = [
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries"
  ];
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Using list.length
for (var i = 0; i < list.length; i++) {
    var fruit = list[i];
}
pending…
Variables outside of the for loop
var i = 0,
    len = list.length;

for (; i < len; i++) {
    var fruit = list[i];
}
pending…

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