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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Browser: Chrome 117

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Object.fromEntries(array.map)	241.1 Ops/sec
array.reduce	21982.7 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; }, {});