Run results for: array spread vs concat vs from vs slice - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:85.0) Gecko/20100101 Firefox/85.0

Browser: Firefox 85

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Array.prototype.concat	11660920.0 Ops/sec
Array.prototype.from	5225323.0 Ops/sec
Array.prototype.slice	23010920.0 Ops/sec
spread operator	9857633.0 Ops/sec

Website performance monitoring

Tests:

Array.prototype.concat
const array = [1, 2] const newArray = array.concat()
Array.prototype.from
const array = [1, 2] const newArray = Array.from(array)
Array.prototype.slice
const array = [1, 2] const newArray = array.slice(0)
spread operator
const array = [1, 2] const newArray = [...array]