Run results for: BM | For + Push vs Map

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1.2 Safari/605.1.15

Browser: Safari 14

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Run with For + Array.push	4508431.0 Ops/sec
Run with Map	3727634.0 Ops/sec

Tests:

Run with For + Array.push
const dataset = [ { id: 1, name: 'A' }, { id: 2, name: 'B' }, { id: 3, name: 'C' }, { id: 4, name: 'D' }, { id: 5, name: 'E' }, { id: 6, name: 'F' }, { id: 7, name: 'G' }, { id: 8, name: 'H' }, { id: 9, name: 'I' }, { id: 10, name: 'J' }, ] const list = [] for (let i = 0; i < dataset.length; i++) { list.push({ id: dataset[i].id, name: dataset[i].name, increment: i }) }
Run with Map
const dataset = [ { id: 1, name: 'A' }, { id: 2, name: 'B' }, { id: 3, name: 'C' }, { id: 4, name: 'D' }, { id: 5, name: 'E' }, { id: 6, name: 'F' }, { id: 7, name: 'G' }, { id: 8, name: 'H' }, { id: 9, name: 'I' }, { id: 10, name: 'J' }, ] const list = dataset.map((d, i) => ({ id: d.id, name: d.name, increment: i }))