Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    math_abs = Math.abs;
    var a = Math.random();
    if(Math.random()<0.5) a=-a;
  };
</script>

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a = Math.abs(a);

a = a<0?-a:a;

a = math_abs(a);

if (a<0) a=-a;

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