Run results for: className.indexOf vs. classList.contains

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; RMX1993) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Mobile Safari/537.36 OPR/64.3.3282.60839

Browser: Opera Mobile 64

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
className	25469.8 Ops/sec
classList	10585.1 Ops/sec

HTML Preparation code:

<div id="foo" class="test"></div>

Tests:

className
var element = document.getElementById("foo"); var i = 1000; while (i--) { if (element.className.indexOf("test") !== -1) {} }
classList
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.contains("test"); }