each2 vs each vs quickEach

JavaScript performance comparison

Revision 24 of this test case created by

Preparation code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
(function($) {
  
  // Create a placeholder jQuery object with a length of 1. The single item
  // is completely arbitrary and will be replaced.
  var jq = $([1]);
  
  $.fn.each2 = function( fn ) {
    var i = -1;
    
    while (
      // Set both the first element AND context property of the placeholder
      // jQuery object to the DOM element. When i has been incremented past the
      // end, this[++i] will return undefined and abort the while loop.
      ( jq.context = jq[0] = this[++i] )
      
      // Invoke the callback function in the context of the DOM element,
      // passing both the index and the placeholder jQuery object in. Like
      // .each, if the callback returns `false`, abort the while loop.
      && fn.call( jq[0], i, jq ) !== false
    ) {}
    
    // Return the initial jQuery object for chainability.
    return this;
  };
  
})(jQuery);
(function($)
{
	$.fn.quickEach = function(c)
	{
		var j = $([0]), i = -1, l = this.length;
		while(
			++i < l
			&& (j[0] = this[i])
			&& c.call(j, i, j[0]) !== false
		);
		return this;
	};
})(jQuery);  
// Create a whole bunch of elements for iteration.
  var elems = $('<div/>').append(Array(1000).join('<span/>')).children();
</script>
    

Preparation code output

<script> (function($) { // Create a placeholder jQuery object with a length of 1. The single item // is completely arbitrary and will be replaced. var jq = $([1]); $.fn.each2 = function( fn ) { var i = -1; while ( // Set both the first element AND context property of the placeholder // jQuery object to the DOM element. When i has been incremented past the // end, this[++i] will return undefined and abort the while loop. ( jq.context = jq[0] = this[++i] ) // Invoke the callback function in the context of the DOM element, // passing both the index and the placeholder jQuery object in. Like // .each, if the callback returns `false`, abort the while loop. && fn.call( jq[0], i, jq ) !== false ) {} // Return the initial jQuery object for chainability. return this; }; })(jQuery); (function($) { $.fn.quickEach = function(c) { var j = $([0]), i = -1, l = this.length; while( ++i < l && (j[0] = this[i]) && c.call(j, i, j[0]) !== false ); return this; }; })(jQuery); // Create a whole bunch of elements for iteration. var elems = $('<div/>').append(Array(1000).join('<span/>')).children(); </script>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
jQuery each2 plugin
elems.each2(function(i, jq) {
 jq;   // jQuery object
 this; // DOM element
});
pending…
jQuery core .each method
elems.each(function(i, elem) {
 $(this); // jQuery object
 this;    // DOM element
});
pending…
jQuery quickEach plugin
elems.quickEach(function(i, elem) {
 this; // jQuery object
 elem; // DOM element
});
pending…

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