jQuery .closest( '.class' ) vs custom closestByClassName( 'class' ) (v3)

Revision 3 of this benchmark created on

Preparation HTML

<section>
<div><div><div><div><div id="end" class="end"><div><div><div><div><div><div><div><div>
<article>
<p>
<span id="start" class="start"></span>
</p>
</article>
</div></div></div></div></div></div></div></div></div></div></div></div></div>
</section>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

Setup

var startJQ = $( '#start' ),
        startDOM = $( '#start' )[0];
    
    Element.prototype.closestByClassName = function ( className ) {
    
        return this.className && this.className.split( ' ' ).indexOf( className ) > -1
            ? this
            : ( this.parentNode.closestByClassName && this.parentNode.closestByClassName( className ) );
    
    };

Test runner

Ready to run.

Testing in
TestOps/sec
closest( '.class' )
var element = startJQ.closest( '.start' ),
    element = startJQ.closest( '.end' ),
    element = startJQ.closest( '.not-found' );
 
ready
custom closestByClassName
var element = startDOM.closestByClassName( 'start' ),
    element = startDOM.closestByClassName( 'end' ),
    element = startDOM.closestByClassName( 'not-found' );
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.