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: 3 months ago

Test name	Executions per second
Array.prototype.concat 10 items	21859234.0 Ops/sec
Spread operator 10 items	13440895.0 Ops/sec
Array.prototype.concat 100 items	9201733.0 Ops/sec
Spread operator 100 items	1944837.8 Ops/sec
Array.prototype.concat 10K items	157737.3 Ops/sec
Spread operator 10K items	20592.3 Ops/sec

Script Preparation code:

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

Tests: