Run results for: Array.map vs preallocation

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser: Chrome 124

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Preallocation

203/s

Map

54/s

View exact numbers

Test name	Executions per second
✓ Preallocation	203 Ops/sec
Map	54 Ops/sec

Tests:

Map
const array2 = new Array(1000000).fill(0).map((item, index) => index);
Preallocation
const array2 = new Array(1000000).fill(0); for (let i = 0; i < array2.length; i++) array2[i] = i;