Run results for: NodeList for vs forEach vs length cached

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 Edg/126.0.0.0

Browser: Chrome 126

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

for with length caching

892/s

forEach

748/s

for

674/s

View exact numbers

Test name	Executions per second
✓ for with length caching	892 Ops/sec
forEach	748 Ops/sec
for	674 Ops/sec

Script Preparation code:

var div = document.createElement('div');
for (let i = 0; i < 1000; i++) {
    div.insertAdjacentHTML('beforeend', `<span>span-${i}<span>`);
}

var list = div.querySelectorAll('span');

Tests:

for
for(let i = 0; i < list.length; i++) { list[i].setAttribute('tabindex', '-1'); }
forEach
list.forEach(item =>{ item.setAttribute('tabindex', '-1'); });
for with length caching
for(let i = 0, l=list.length; i < l; i++) { list[i].setAttribute('tabindex', '-1'); }