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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.2 Safari/605.1.15

Browser: Safari 13

Operating system: Mac OS X 10.13.6

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
jQuery 3.3.1 addClass/removeClass	150338.6 Ops/sec
jQuery 2.1.4 addClass/removeClass	184619.8 Ops/sec
Vanilla JS classList add/remove	398215.4 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