Run results for: Array.map vs preallocation

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_7_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/122.0 Mobile/15E148 Safari/605.1.15

Browser: Mobile Safari 16

Operating system: iOS 16.7.2

Device Platform: Mobile

Date tested: 2 years ago

Preallocation

185/s

Map

121/s

View exact numbers

Test name	Executions per second
✓ Preallocation	185 Ops/sec
Map	121 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;