Run results for: simple array and map vs forEach vs for by cuteLuna v2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.0 Safari/605.1.15

Browser: Safari 16

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

map

11.3M/s

foreach

8.3M/s

View exact numbers

Test name	Executions per second
✓ map	11,325,292 Ops/sec
foreach	8,275,588 Ops/sec

Script Preparation code:

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

Tests:

map
const arr = [{ name: 'luna', id: 3 },{ name: 'abc', id: 4 }, { name: 'eee', id: 3 }] const newArr = arr.map(e=> ({ label: e.name, id: e.id}))
foreach
const arr = [{ name: 'luna', id: 3 },{ name: 'abc', id: 4 }, { name: 'eee', id: 3 }] const newArr = []; arr.forEach(item => { newArr.push({ label: item.name, id: item.id }) })
for
const arr = [{ name: 'luna', id: 3 }, { name: 'abc', id: 4 }, { name: 'eee', id: 3 }]; const arrLength = arr.length; const newArr = []; for (let i = 0; i < arrLength; i++) { newArr.push({ label: arr[i].name, id: arr[i].id }); }