Fast Array Foreach

JavaScript performance comparison

Revision 3 of this test case created by foobar

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
      // Populate the base array
      var arr = [];
      for (var i = 0; i < 1000; i++) {
        arr[i] = i;
      }
   
      function someFn(i) {
        return i * 3 * 8;
      }
   
    function each(fn, context){
          var self = this
            , index = 0
            , length = self.length
   
          for(;index < length; index++) fn.call(context, self[index], index, self)
   
          return self
        }
   
    Array.prototype.each = each
};
</script>

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Testing in unknown unknown
Test Ops/sec
Array.ForEach
arr.forEach(someFn)
pending…
For
for (var i = 0, len = arr.length; i < len; i++) {
  someFn(arr[i]);
}
pending…
each
arr.each(someFn)
pending…

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