Preparation code

<script src="https://raw.github.com/documentcloud/underscore/master/underscore-min.js" type="text/javascript"></script>
<script type="text/javascript">
  //save underscore
  window.us = _;
  _ = null;
</script>
<script src="//cdnjs.cloudflare.com/ajax/libs/lodash.js/1.0.1/lodash.min.js"></script>
<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(array[index], index, array) === false) {
          break;
        }
      }
      return array;
    }
  };
</script>

Preparation code output

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customForEach(array, callback);

array.forEach(callback);

us.each(array, callback);

_.each(array, callback);

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by John-David Dalton on 11th March 2012
• Revision 4: published by John-David Dalton on 16th March 2012 and last updated on 16th February 2013
• Revision 5: published on 22nd February 2013
• Revision 6: published by ryun on 23rd February 2013
• Revision 7: published on 14th March 2013

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