Run results for: Convert Array to Object 2 - Object.fromEntries vs reduce

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36

Browser: Chrome 99

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Reduce (reuse object)

5K/s

Object.fromEntries

3K/s

Reduce (creating temporary objects)

37/s

View exact numbers

Test name	Executions per second
✓ Reduce (reuse object)	4,878 Ops/sec
Object.fromEntries	2,946 Ops/sec
Reduce (creating temporary objects)	37 Ops/sec

Script Preparation code:

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

Tests:

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