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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Spread operator 10 items

5.6M/s

Array.prototype.concat 10 items

3.7M/s

Array.prototype.concat 100 items

3.0M/s

Spread operator 100 items

1.7M/s

Array.prototype.concat 10K items

138K/s

Spread operator 10K items

22K/s

View exact numbers

Test name	Executions per second
✓ Spread operator 10 items	5,617,109 Ops/sec
Array.prototype.concat 10 items	3,723,277 Ops/sec
Array.prototype.concat 100 items	2,976,418 Ops/sec
Spread operator 100 items	1,677,599 Ops/sec
Array.prototype.concat 10K items	138,104 Ops/sec
Spread operator 10K items	21,969 Ops/sec

Script Preparation code:

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

Tests: