jQuery each2 plugin vs jQuery core .each method (v7)

Revision 7 of this benchmark created by Flatlineato on

Description

Basically, if you're going to do $(this) inside an .each loop, you should consider using the jQuery each2 plugin instead, because it's specifically optimized for this extremely common use case!

Preparation HTML

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

<!-- the plugin -->
<script src="http://github.com/cowboy/jquery-misc/raw/master/jquery.ba-each2.js"></script>

<script>
  // Create a whole bunch of elements for iteration.
  var elems = $('<div/>').append(Array(1000).join('<span/>')).children();
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
jQuery each2 plugin
elems.each2(function(i, jq) {
 jq; // Use at will!
 jq; // No performance penalty.
 jq; // No performance penalty.
});
ready
jQuery core .each method
elems.each(function(i, elem) {
 var jq = $(this); // This is the best we can do here.
 jq; // No performance penalty.
 jq; // No performance penalty.
 jq; // No performance penalty.
});
ready
jQuery core .each, $(this) x 2
elems.each(function(i, elem) {
 $(this); // Really inefficient code, you know,
 $(this); // like you see all over the web...
});
ready
jQuery core .each, $(this) x 4
elems.each(function(i, elem) {
 $(this); // Really inefficient code, you know,
 $(this); // like you see all over the web...
 $(this); // Etc...
 $(this); // Etc...
});
ready
jQuery core .each, $(this) x 10
elems.each(function(i, elem) {
 for (var i = 0; i < 10; i++) {
  $(this); // Let's see the cost of doing $(this) 10x.
 }
});
ready
Putting things into perspective...
elems.each2(function(i, jq) {
 // This should give some sense of how disproportionate the
 // $(this) savings are compared to actual DOM manipulations.
 jq.addClass('foo');
});
ready
Putting things into perspective 2 ...
elems.each(function(i, elem) {

});
ready

Revisions

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