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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:146.0) Gecko/20100101 Firefox/146.0

Browser: Firefox 146

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 8 months ago

Benchmark engine: Benchmark.js

Array.push in for loop

225K/s

Spread operator

21K/s

View exact numbers

Test name	Executions per second
✓ Array.push in for loop	225,161 Ops/sec
Spread operator	21,044 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] }