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

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
Chrome 135
Windows
Desktop
25 days ago
Test name Executions per second
className 48034.4 Ops/sec
classList 15274.7 Ops/sec
HTML Preparation code:
AخA
 
1
<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");
    }