for vs array-foreach (v12)

Revision 12 of this benchmark created on

Setup

var array = Array(1000).join('xxxxxxxx').split('');
    
    function callback(value, index, object) {
      return value;
    }
    
    Array.prototype.customForEach = function(fn, scope) {
      'use strict';
      var i, len;
      for (i = 0, len = this.length; i < len; ++i) {
        if (i in this) {
          fn.call(scope, this[i], i, this);
        }
      }
    }

Test runner

Ready to run.

Testing in
TestOps/sec
for-loop
var scope;
for (var index = 0, length = array.length; index < length; index++) {
  if (index in array) callback.call(scope, array[index], index, array);
}
ready
Array#forEach
array.forEach(callback);
ready
for-loop naive
for (var index = 0; index < array.length; index++) {
  callback.call(this, array[index], index, array);
}
ready
customForEach
array.customForEach(callback);
ready

Revisions

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