Preparation code

<script>
  Benchmark.prototype.setup = function() {
    var doStuff = function(number) {
        return number + number;
        };
  };
</script>

Test runner

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for (i = 0; i < 100000; i++) {
  doStuff(i);
}

for (i = 100000; i > 0; i--) {
  doStuff(i);
}

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