Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
  };
</script>

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var length = arr.length;
while(length -= 1) {
  console.log(arr[length]);
}

var length = arr.length,
    i = 0;

for (; i < length; i += 1) {
  console.log(arr[length]);
}

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