Run results for: classList.contains vs. RegExp.test

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.0

Browser: Firefox 136

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

classList

2K/s

RegExp

2K/s

View exact numbers

Test name	Executions per second
✓ classList	1,962 Ops/sec
RegExp	1,611 Ops/sec

HTML Preparation code:

<div id="select_true" class="aaa bbb selected"></div>
<div id="select_false" class="aaa bbb ccc"></div>

Script Preparation code:

var rxSelected = /\bselected\b/i;

Tests:

classList
for (var i = 1000; i--; ) { document.getElementById("select_true").classList.contains("selected"); document.getElementById("select_false").classList.contains("selected"); }
RegExp
for (var i = 1000; i--; ) { rxSelected.test(document.getElementById("select_true").className); rxSelected.test(document.getElementById("select_false").className); }