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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/119.0

Browser: Firefox 119

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Array.push in for loop

51K/s

Spread operator

6K/s

View exact numbers

Test name	Executions per second
✓ Array.push in for loop	50,965 Ops/sec
Spread operator	5,513 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] }