Run results for: className vs. classList (comparing and adding) FORK

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_1) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0.1 Safari/605.1.15

Browser: Safari 12

Operating system: Mac OS X 10.14.1

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
className	2208.5 Ops/sec
classList	3294.6 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) { element.className = "bar"; }else { element.className = "test"; } }
classList
var element = document.getElementById("foo"); var i = 1000; while (i--) { if(element.classList.contains("test")) { element.classList.add("bar"); } else { element.classList.add("test"); } }