Run results for: Array.prototype.concat vs spread operator 2023

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Array.prototype.concat

366K/s

Spread operator

151K/s

View exact numbers

Test name	Executions per second
✓ Array.prototype.concat	366,218 Ops/sec
Spread operator	151,499 Ops/sec

Tests:

Array.prototype.concat
const a = Array(1000).fill('a'); const b = Array(1000).fill('b'); const ab = a.concat(b);
Spread operator
const a = Array(1000).fill('a'); const b = Array(1000).fill('b'); const ab = [...a, ...b];