Run results for: BM | For + Push vs Map

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36

Browser: Chrome 95

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Run with For + Array.push	11938144.0 Ops/sec
Run with Map	12728467.0 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 }))