Benchmark: flatMap() vs filter().map() vs for loop accumulator vs forEach vs for of loop

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 1E5) arr[i] = i++;

Tests:

filter().map()
arr.filter(x => x % 30).map(x => x/100)
flatMap()
arr.flatMap(x => x % 30 ? x/100 : [])
for loop
var accum = []; for (let i=0; i < arr.length; i++) { const x = arr[i]; if (x % 30) { accum.push(x/100) } }
forEach
var accum = []; arr.forEach((x) => { if (x % 30){ accum.push(x/100) } })
for of loop
var accum = []; for (const x of arr) { if (x % 30) { accum.push(x/100) } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
filter().map()
flatMap()
for loop
forEach
for of loop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Linux

View result in a separate tab

for of loop

519/s

for loop

504/s

forEach

349/s

flatMap()

268/s

filter().map()

264/s

View exact numbers

Test name	Executions per second
✓ for of loop	519 Ops/sec
for loop	504 Ops/sec
forEach	349 Ops/sec
flatMap()	268 Ops/sec
filter().map()	264 Ops/sec

flatMap() vs filter().map() vs for loop accumulator vs forEach vs for of loop (version: 1)

flatMap vs filter map

Comparing performance of: `filter().map() vs flatMap() vs for loop vs forEach vs for of loop`

Created: one year ago by: Guest

Go to the latest result

filter().map()

flatMap()

for loop

forEach

for of loop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

flatMap() vs filter().map() vs for loop accumulator vs forEach vs for of loop (version: 1)

flatMap vs filter map

Comparing performance of: filter().map() vs flatMap() vs for loop vs forEach vs for of loop

Created: one year ago by: Guest

Go to the latest result

filter().map()

flatMap()

for loop

forEach

for of loop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `filter().map() vs flatMap() vs for loop vs forEach vs for of loop`