Run results for: simple array and map vs forEach vs for by cuteLuna v3

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

map

19.6M/s

foreach

17.3M/s

for

4.0M/s

View exact numbers

Script Preparation code:

var arr = [{ name: 'luna', id: 3 },{ name: 'abc', id: 4 }, { name: 'eee', id: 3 }]

Tests:

map
const newArr = arr.map(e=> ({ label: e.name, id: e.id}))
foreach
const newArr = []; arr.forEach((item, index) => { newArr[index] = {label: item.name, id: item.id} })
for
const arrLength = arr.length; const newArr = []; for (let i = 0; i < arrLength; i++) { newArr[i] = {label: arr[i].name, id: arr[i].id} }