Run results for: Map vs Preallocation (object)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36 Edg/118.0.2048.1

Browser: Chrome 118

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Preallocation

7/s

Map

5/s

View exact numbers

Test name	Executions per second
✓ Preallocation	7 Ops/sec
Map	5 Ops/sec

Script Preparation code:

var array = new Array(1000000).fill(0);

Tests:

Map
const array2 = array.map((item, index) => ({ name: `name${index}`, email: `email${index}`, address: `address${index}`, }));
Preallocation
const array2 = new Array(1000000).fill(0); for (let i = 0; i < array2.length; i++) { array2[i] = { name: `name${i}`, email: `email${i}`, address: `address${i}` }; }