Run results for: Benchmark: flatMap vs reduce vs while vs foreach vs for of - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; MI 8 Lite) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Mobile Safari/537.36

Browser: Chrome Mobile 100

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
flatMap	1110.9 Ops/sec
reduce	184.8 Ops/sec
while	4128.0 Ops/sec
foreach	42132.9 Ops/sec
for	4103.1 Ops/sec
for of	47069.8 Ops/sec

Website performance monitoring

Script Preparation code:

var n = Array.from(Array(1000).keys())

Tests:

flatMap
n.flatMap((x,i) => [++i,i++])
reduce
n.reduce((acc, cur) => [...acc, ++cur, cur++], [])
while
let res = [], i=0; while(n.length>i++) res.push(i, i);
foreach
let res = []; n.forEach((_,i) => res.push(i+1, i+1))
for
let res = []; for (let i = 0; i < n.length; i++) { res.push(i+1, i+1) }
for of
let res = []; for (const i of n) { res.push(i+1, i+1) }