Run results for: loop performance test

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:64.0) Gecko/20100101 Firefox/64.0

Browser: Firefox 64

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
foreach	22784.0 Ops/sec
classic for	22090.2 Ops/sec
for of	22649.0 Ops/sec

HTML Preparation code:

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