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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:99.0) Gecko/20100101 Firefox/99.0

Browser: Firefox 99

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
flatMap	12650.5 Ops/sec
reduce	55.2 Ops/sec
while	19040.7 Ops/sec
foreach	145612.7 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))

;