jQuery.fn.each vs. quickEach vs. each2

JavaScript performance comparison

Revision 37 of this test case created

Info

My each2 plugin

Based on http://jsperf.com/jquery-each-vs-quickeach.

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<script>
  var a = $('<div/>').append(Array(100).join('<a></a>')).find('a');

  // My each2 plugin
  (function($) {
    var jq = $([]);
    $.fn.each2 = function(fn) {
      var i = -1;
      while ((jq[0] = this[++i]) && fn.call(jq[0], i, jq) !== false) {}
      return this;
    };
  })(jQuery);

  (function($) {
    var jq = $([]);
    $.fn.each2_ref = function(fn) {
      var i = -1,
          elem;
      while ((elem = jq[0] = this[++i]) && fn.call(elem, i, jq) !== false) {}
      return this;
    };
  })(jQuery);

  (function($) {
    var jq = $([]);
    $.fn.each2_len = function(fn) {
      var i = -1,
          len = this.length;
      while (++i < len && (jq[0] = this[i]) && fn.call(jq[0], i, jq) !== false) {}
      delete jq[0];
      return this;
    };
  })(jQuery);

  (function($) {
    var jq = $([]);
    $.fn.each2_ref_len = function(fn) {
      var i = -1,
          len = this.length,
          elem;
      while (++i < len && (elem = jq[0] = this[i]) && fn.call(elem, i, jq) !== false) {}
      delete jq[0];
      return this;
    };
  })(jQuery);
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
no elem re length comparison
 
a.each2(function(i, jq) {
  $(this);
});
 pending…
original jQuery.fn.each (reference)
 
a.each(function(i, elem) {
  $(this);
});
 pending…

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