Run results for: JavaScript V8 Array.push vs spread operator

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.5 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 26

Operating system: iOS 18.7

Device Platform: Mobile

Date tested: 3 months ago

Benchmark engine: Benchmark.js

Array.push in for loop

379K/s

Spread operator

23K/s

View exact numbers

Test name	Executions per second
✓ Array.push in for loop	378,567 Ops/sec
Spread operator	23,450 Ops/sec

Tests:

Array.push in for loop
const arr1 = Array(1000).fill(0); const arr2 = Array(0); for (const el of arr1) { arr2.push(el) }
Spread operator
const arr1 = Array(10000).fill(0); let arr2 = Array(0); for (const el of arr1) { arr2 = [arr2, el] }