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/137.0.0.0 Safari/537.36

Browser: Chrome 137

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Reduce (reuse object)

4K/s

Map

3K/s

Object.fromEntries

457/s

Reduce (creating temporary objects)

144/s

View exact numbers

Test name	Executions per second
✓ Reduce (reuse object)	4,153 Ops/sec
Map	2,540 Ops/sec
Object.fromEntries	457 Ops/sec
Reduce (creating temporary objects)	144 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());