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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36 SberBrowser/3.1.0.0

Browser: Chrome 105

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
flatMap	2236.9 Ops/sec
reduce	725.3 Ops/sec
while	11205.5 Ops/sec
foreach	404697.6 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))

;