Run results for: classList.contains vs.

Run details:

User agent: Mozilla/5.0 (Linux; Android 9; N20) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.116 Mobile Safari/537.36 EdgA/45.08.4.5073

Browser: Chrome Mobile 77

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
Use hasClass shorthand	350669.3 Ops/sec
Use classList	514503.6 Ops/sec

HTML Preparation code:

<div id="foo" class="bar baz"></div>

Script Preparation code:

var test_element = document.getElementById("foo");

Tests:

Use hasClass shorthand
function hasClass(element, classes) { classes = classes.split(' '); for (var i = 0; i < classes.length; i++) { if (!element.classList.contains(classes[i])) { return false; } } return true; }; hasClass(test_element, "bar baz");
Use classList
test_element.classList.contains("bar"); test_element.classList.contains("baz");