Run results for: Object.fromEntries vs reduce vs Map

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser: Chrome 138

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Reduce (reuse object)

2K/s

Map

1K/s

Object.fromEntries

262/s

Reduce (creating temporary objects)

49/s

View exact numbers

Test name	Executions per second
✓ Reduce (reuse object)	1,923 Ops/sec
Map	1,263 Ops/sec
Object.fromEntries	262 Ops/sec
Reduce (creating temporary objects)	49 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() }), {});
Map
Object.entries(data).reduce((acc, [k, v]) => { acc.set(k, v.toString()) return acc; }, new Map());