Run results for: loop performance test

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36

Browser: Chrome 71

Operating system: Mac OS X 10.13.6

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
foreach	22175.2 Ops/sec
classic for	28196.7 Ops/sec
for of	18595.7 Ops/sec

HTML Preparation code:

<div class="wrapper">
    <div class="element"></div>
    <div class="element"></div>
    <div class="element"></div>
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    <div class="element"></div>
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</div>

Tests:

foreach
let elements = document.querySelectorAll('.element'); elements.forEach(function (value) { value.classList.add('test'); });
classic for
let elements = document.querySelectorAll('.element'); for (let i = 0; i < elements.length; i++) { elements[i].classList.add('test'); }
for of
let elements = document.querySelectorAll('.element'); for (let el of elements) { el.classList.add('test'); }

Run results for: loop performance test

foreach

classic for

for of