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: 2 years ago

Benchmark engine: Benchmark.js

reduceRight 50

6.1M/s

slice and reverse 50

3.8M/s

reduceRight 150

924K/s

slice and reverse 150

669K/s

reduceRight 500

261K/s

slice and reverse 500

222K/s

View exact numbers

Test name	Executions per second
✓ reduceRight 50	6,111,105 Ops/sec
slice and reverse 50	3,833,369 Ops/sec
reduceRight 150	924,154 Ops/sec
slice and reverse 150	669,209 Ops/sec
reduceRight 500	260,929 Ops/sec
slice and reverse 500	222,403 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)