Run results for: test children matches vs classList vs querySelectorAll vs getElementsByClassName

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser: Chrome 109

Operating system: Windows

Device Platform: Desktop

Date tested: 2 months ago

Test name	Executions per second
matches	3021.2 Ops/sec
classList	3086.2 Ops/sec
className	3037.0 Ops/sec
querySelectorAll	30344.3 Ops/sec
getElementsByClassName	15290833.0 Ops/sec

HTML Preparation code:

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

Script Preparation code:

const count = 1000;
const holder = document.getElementById('test');

for (let i = 0; i < count; i++) {
   let elem = document.createElement('div');
   elem.classList.add(0|Math.random()*2 ? 'foo' : 'bar');
   holder.appendChild(elem);
}

Tests:

matches
const result = Array.from(holder.children).filter((node) => node.matches('.foo'));
classList
const result = Array.from(holder.children).filter((node) => node.classList.contains('foo'));
className
const result = Array.from(holder.children).filter((node) => node.className.includes('foo'));
querySelectorAll
const result = holder.querySelectorAll(':scope > .foo');
getElementsByClassName
const result = holder.getElementsByClassName('foo');

Run results for: test children matches vs classList vs querySelectorAll vs getElementsByClassName

matches

classList

className

querySelectorAll

getElementsByClassName