Run results for: array iteration vs map + filter vs for..of vs for loop

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:148.0) Gecko/20100101 Firefox/148.0

Browser: Firefox 148

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 4 months ago

forEach

10K/s

for loop

9K/s

map

9K/s

for..of

9K/s

View exact numbers

Test name	Executions per second
✓ forEach	9,563 Ops/sec
for loop	9,344 Ops/sec
map	9,334 Ops/sec
for..of	9,323 Ops/sec

Script Preparation code:

const obj = (id, data = false) => ({
    data: data ? {} : undefined,
    id
})

const array = [...Array.from({
    length: 10
})].map((_, i) => obj(i, i % 2 === 0))

Tests:

forEach
array.forEach((value, index) => { if (value.data) { console.log(value) } })
map
array.filter(({ data }) => !!data).map((value, index) => { console.log(value) })
for..of
for (const value of array) { if (value.data) { console.log(value) } }
for loop
for (let i = 0; i < array.length; i++) { if (array[i].data) { console.log(array[i]) } }