for vs array-foreach

JavaScript performance comparison

Revision 9 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;
    }
   
    function customForEach(array, callback, thisArg) {
          var index = -1,
              length = array.length;
       
          while (++index < length) {
            if (callback(array[index], index, array) === false) {
              break;
            }
          }
          return array;
        }
};
</script>

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Testing in unknown unknown
Test Ops/sec
for-var loop
for (var index in array) {
  callback(array[index], index, array);
}
pending…
for index loop
for(var index = 0, len = array.length; index < len; ++index) {
  callback(array[index], index, array);
}
pending…
Native foreach
array.forEach(callback);
pending…
Custom Foreach
customForEach(array, callback);
pending…

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