Run results for: Array.push + Array.reverse vs Array.unshift

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/136.2 Mobile/15E148 Safari/605.1.15

Browser: Mobile Safari 18

Operating system: iOS 18.3.2

Device Platform: Mobile

Date tested: one year ago

Array.push + Array.reverse

27K/s

Array.unshift

97/s

View exact numbers

Test name	Executions per second
✓ Array.push + Array.reverse	26,670 Ops/sec
Array.unshift	97 Ops/sec

Script Preparation code:

const array = Array.from({length: 10_000}, () => Math.floor(Math.random() * 10_000_000))

Tests:

Array.push + Array.reverse
const temp = []; array.forEach(x => temp.push(x)); return temp.reverse();
Array.unshift
const temp = []; array.forEach(x => temp.unshift(x)); return temp;