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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
flatMap	35540.9 Ops/sec
reduce	1321.5 Ops/sec
while	217692.6 Ops/sec
foreach	190030.2 Ops/sec
for	221181.1 Ops/sec
for of	276709.2 Ops/sec

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) }