jQuery.fn.each vs. jQuery.fn.quickEach vs. Prototype Array.each

JavaScript performance comparison

Revision 22 of this test case created by mhitza


The quickEach method will pass a non-unique jQuery instance to the callback meaning that there will be no need to instantiate a fresh jQuery instance on each iteration. Most of the slow-down inherent in jQuery’s native iterator method (each) is the constant need to have access to jQuery’s methods, and so most developers see constructing multiple instances as no issue… A better approach would be quickEach.

Further added the each implementation from the Prototype library (with a small variation) which yields better results, because when available it will use the browser Array.each implementation.

Preparation code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

  var a = $('<div/>').append(Array(100).join('<a></a>')).find('a');
  jQuery.fn.quickEach = (function() {
   var jq = jQuery([1]);
   return function(c) {
    var i = -1,
        el, len = this.length;
    try {
     while (++i < len && (el = jq[0] = this[i]) && c.call(jq, i, el) !== false);
    } catch (e) {
     delete jq[0];
     throw e;
    delete jq[0];
    return this;
  // The Prototype library Array.each implementation
  jQuery.fn.prototypeEach = (function() {
   var arrayProto = Array.prototype,
       slice = arrayProto.slice,
       _each = arrayProto.forEach;
   return !!_each ? _each : function(iterator, context) {
    for (var i = 0, length = this.length >>> 0; i < length; i++) {
     if (i in this) iterator.call(context, this[i], i, this);

Preparation code output

Test runner

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Testing in unknown unknown
Test Ops/sec
a.each(function() {
a.quickEach(function() {
 this; // jQuery object
a.prototypeEach(function() {
 this; // jQuery
}, jQuery());

Compare results of other browsers


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