Run results for: Step through array in reverse order - reduceRight vs reverse

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

Operating system: Windows

Device Platform: Desktop

Date tested: 6 months ago

Test name	Executions per second
slice and reverse 50	3833368.8 Ops/sec
reduceRight 50	6111105.0 Ops/sec
slice and reverse 150	669208.7 Ops/sec
reduceRight 150	924154.1 Ops/sec
slice and reverse 500	222402.5 Ops/sec
reduceRight 500	260928.6 Ops/sec

Script Preparation code:

var nums50 = Array.from({length:  50}, () => Math.random() * 100 |0)
var nums150 = Array.from({length: 150}, () => Math.random() * 100 |0)
var nums500 = Array.from({length: 500}, () => Math.random() * 100 |0)

Tests:

slice and reverse 50
nums50.slice().reverse().forEach(n => n**2)
reduceRight 50
nums50.reduceRight((_,n) => n**2, null)
slice and reverse 150
nums150.slice().reverse().forEach(n => n**2)
reduceRight 150
nums150.reduceRight((_,n) => n**2, null)
slice and reverse 500
nums500.slice().reverse().forEach(n => n**2)
reduceRight 500
nums500.reduceRight((_,n) => n**2, null)

Run results for: Step through array in reverse order - reduceRight vs reverse

slice and reverse 50

reduceRight 50

slice and reverse 150

reduceRight 150

slice and reverse 500

reduceRight 500