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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; rv:128.0) Gecko/20100101 Firefox/128.0

Browser: Firefox 128

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

forEach

28K/s

map

27K/s

for loop

26K/s

for..of

26K/s

View exact numbers

Test name	Executions per second
✓ forEach	27,637 Ops/sec
map	27,237 Ops/sec
for loop	26,445 Ops/sec
for..of	26,111 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]) } }