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testing a custom forEach method

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    //array with 1 mil entries
    var a = [];
    for(var i = 0; i < 1000000; i++){
         a.push(i);
    }
  };
</script>

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var i = -1,
length = a.length - 1;
while(i++ !== length){
a[i] = a[i] * 2;
}

Array.prototype.forEach = function(fn){
  var i = -1,
      length = this.length - 1;
  while(i++ !== length){
    fn(this[i]);
  }
}
a.forEach(function(entry){
entry = entry * 2;
});

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