Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var items = [];
    for (var i = 0; i < 1000; i++) {
    items.push(i);
    }
  };
</script>

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

for (var i = items.length; i > 0; i--) {
    items[i];
}

for (var i = items.length; i > 0; --i) {
    items[i];
}

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

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