jQuery.fn.each vs. jQuery.fn.quickEach

JavaScript performance comparison

Revision 59 of this test case created by David Seigle

Preparation code

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

  jQuery.fn.quickerEach = (function() {
    var jq = jQuery([1]);
    return function(c) {
      var i = -1,
          el;
      try {
        while (el = jq[0] = this[++i] && c.call(jq, i, el) !== false);
      } catch (e) {
        jq[0]=1;
        throw e;
      }
      jq[0]=1;
      return this;
    };
  }());
</script>
    

Preparation code output

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
.each()
a.each(function() {
  $(this).addClass("wibble");
});
pending…
.quickEach()
a.quickEach(function() {
  this.addClass("wibble"); // jQuery object
});
pending…
for loop
var jq = jQuery([1]);
for (var i = a.length; i--;) {
  jq[0] = a[i];
  jq.addClass("wibble"); // jQuery object
}
pending…
.quickerEach()
a.quickerEach(function() {
  this.addClass("wibble"); // jQuery object
});
pending…

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Revisions

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