Run results for: Array.prototype.concat vs spread operator 2024

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:134.0) Gecko/20100101 Firefox/134.0

Browser: Firefox 134

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Array.prototype.concat 10 items

21.9M/s

Spread operator 10 items

13.4M/s

Array.prototype.concat 100 items

9.2M/s

Spread operator 100 items

1.9M/s

Array.prototype.concat 10K items

158K/s

Spread operator 10K items

21K/s

View exact numbers

Test name	Executions per second
✓ Array.prototype.concat 10 items	21,859,234 Ops/sec
Spread operator 10 items	13,440,895 Ops/sec
Array.prototype.concat 100 items	9,201,733 Ops/sec
Spread operator 100 items	1,944,838 Ops/sec
Array.prototype.concat 10K items	157,737 Ops/sec
Spread operator 10K items	20,592 Ops/sec

Script Preparation code:

arr10 = Array(10).fill('x')
arr100 = Array(100).fill('x')
arr10K = Array(10000).fill('x')

Tests: