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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:89.0) Gecko/20100101 Firefox/89.0

Browser: Firefox 89

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
jQuery 3.3.1 addClass/removeClass	360360.6 Ops/sec
jQuery 2.1.4 addClass/removeClass	428193.2 Ops/sec
Vanilla JS classList add/remove	796729.9 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>
<script type="text/javascript">
  var jq331 = $.noConflict(true);
</script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.js'></script>
<script type="text/javascript">
  var jq214 = $.noConflict(true);
</script>
<div id="testElement"></div>

Tests:

jQuery 3.3.1 addClass/removeClass
var element = jq331('#testElement'); element.removeClass('test-class'); element.addClass('test-class'); element.removeClass('test-class');
jQuery 2.1.4 addClass/removeClass
var element = jq214('#testElement'); element.removeClass('test-class'); element.addClass('test-class'); element.removeClass('test-class');
Vanilla JS classList add/remove
var element = jq331('#testElement')[0]; element.classList.remove('test-class'); element.classList.add('test-class'); element.classList.remove('test-class');

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

jQuery addClass/removeClass vs classList.add/remove

jQuery 3.3.1 addClass/removeClass

jQuery 2.1.4 addClass/removeClass

Vanilla JS classList add/remove