Run results for: Object.fromEntries(array.map) vs. array.map.reduce

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

array.reduce

184K/s

Object.fromEntries(array.map)

5K/s

View exact numbers

Test name	Executions per second
✓ array.reduce	183,616 Ops/sec
Object.fromEntries(array.map)	4,573 Ops/sec

Script Preparation code:

var array = Array.from(Array(1000).keys());

Tests:

Object.fromEntries(array.map)
var metadata = Object.fromEntries(array.map(item => ({[item]: {}})));
array.reduce
var metadata = array.reduce((acc, value) => { acc[value] = {}; return acc; }, {});