Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var testArray = [];
    for (i = 0; i < 10000; i++) {
      testArray.push(i);
    }
  };
</script>

Test runner

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for (i = 0; i < testArray.length; i++) {
  var a = testArray[i];
}

var testArrayLength = testArray.length;
for (i = 0; i < testArrayLength; i++) {
  var a = testArray[i];
}

for (i in testArray) {
  var a = testArray[i];
}

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