Run results for: jQuery 1.6.4 addClass/removeClass vs. classList.add/classList.remove

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:64.0) Gecko/20100101 Firefox/64.0

Browser: Firefox 64

Operating system: Mac OS X 10.13

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
jQuery 1.6.4 addClass	546938.3 Ops/sec
jQuery 1.6.4 removeClass	830344.0 Ops/sec
classList add	822306.9 Ops/sec
classList remove	897786.7 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/1.6.4/jquery.js'></script>
<div id="testadd"></div>
<div id="testremove" class="to-remove"></div>

Tests:

jQuery 1.6.4 addClass
var $el = $('#testadd'); $el.addClass('test-class');
jQuery 1.6.4 removeClass
var $el = $('#testremove'); $el.removeClass('to-remove');
classList add
var el = $('#testadd')[0]; el.classList.add('test-class');
classList remove
var el = $('#testremove')[0]; el.classList.remove('to-remove');

Run results for: jQuery 1.6.4 addClass/removeClass vs. classList.add/classList.remove

Compare results of $(el).addClass vs. el.classList.add. And compare $(el).removeClass vs. el.classList.remove..

jQuery 1.6.4 addClass

jQuery 1.6.4 removeClass

classList add

classList remove