Run results for: Convert Array to Object - Object.fromEntries vs reduce

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140.0) Gecko/20100101 Firefox/140.0

Browser: Firefox 140

Operating system: Windows

Device Platform: Desktop

Date tested: 7 months ago

Test name	Executions per second
Object.fromEntries	8067.2 Ops/sec
Reduce (reuse object)	20641.5 Ops/sec
Reduce (creating temporary objects)	0.4 Ops/sec

Script Preparation code:

var data = Array.from(Array(10000).keys()).map(v => ({id: v, value: `val_${v}`}));

Tests:

Object.fromEntries
Object.fromEntries(data.map(({id, value}) => [id, value]));
Reduce (reuse object)
data.reduce((acc, {id, value}) => { acc[id] = value; return acc; }, {});
Reduce (creating temporary objects)
data.reduce((acc, {id, value}) => ({ ...acc, [id]: value }), {});