Run results for: Object.fromEntries vs reduce

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 149

Operating system: Android

Device Platform: Mobile

Date tested: one month ago

Reduce (reuse object)

859/s

Object.fromEntries

90/s

Reduce (creating temporary objects)

24/s

View exact numbers

Test name	Executions per second
✓ Reduce (reuse object)	859 Ops/sec
Object.fromEntries	90 Ops/sec
Reduce (creating temporary objects)	24 Ops/sec

Script Preparation code:

var data = { ...Array.from(Array(10000).keys()) };

Tests:

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