for vs array-foreach

JavaScript performance comparison

Revision 15 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var array = Array(31).join('x').split('');
   
    function callback(value, index, object) {
      return value + index;
    }
   
    function customForEach(array, callback, thisArg) {
      var fn = callback,
        index = -1,
        length = array.length;
   
      while (++index < length) {
        if (callback.call(thisArg, array[index], index, array) === false) {
          break;
        }
      }
      return array;
    }
   
    function foreach(arr, cb, thisArg) {
      var i = 0,
        l = arr.length;
      thisArg = thisArg || this;
      for (; i < l; i++) {
        cb.call(thisArg, arr[i], i, arr);
      }
    }
};
</script>

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Testing in unknown unknown
Test Ops/sec
custom forEach
customForEach(array, callback);
pending…
Array#forEach
array.forEach(callback);
pending…
foreach
foreach(array, callback);
pending…

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