Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<script>
  Benchmark.prototype.setup = function() {
    var arr = []
    
    for (var i = 0; i < 1000; i++) {
      arr[i] = Math.random();
    }
  };
</script>

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

var l = arr.length;
while (l--) {
  arr[l] = Math.random();
}

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