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

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 129

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
flatMap	11419.7 Ops/sec
reduce	345.4 Ops/sec
while	9585.7 Ops/sec
foreach	238820.5 Ops/sec

Script Preparation code:

var n = 1000

Tests:

flatMap
[...Array(n)].flatMap((x,i) => [++i,i++])
reduce
[...Array(n).keys()].reduce((acc, cur) => [...acc, ++cur, cur++], [])
while
let res = [], i=0; while(n>i++) res.push(i, i);
foreach
let res = []; Array(n).forEach((_,i) => res.push(i+1, i+1))