Preparation code

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

Preparation code output

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

for (var i = a.length -1; i = 0 ; i--) {
    a[i];
}

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

var i = a.length - 1;
for (; i = 0 ; i--) {
    a[i];
}

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