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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:124.0) Gecko/20100101 Firefox/124.0

Browser: Firefox 124

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Array.prototype.concat

126K/s

Spread operator

71K/s

View exact numbers

Test name	Executions per second
✓ Array.prototype.concat	125,771 Ops/sec
Spread operator	70,797 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];