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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:132.0) Gecko/20100101 Firefox/132.0

Browser: Firefox 132

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Array.prototype.concat

175K/s

Spread operator

75K/s

View exact numbers

Test name	Executions per second
✓ Array.prototype.concat	174,536 Ops/sec
Spread operator	74,634 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];