Run results for: Object.fromEntries vs reduce vs Map - fixed

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser: Chrome 138

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Reduce (reuse object)

2K/s

Map

2K/s

Object.fromEntries

1K/s

Reduce (assigning into reused object)

289/s

Reduce (recreating object)

97/s

View exact numbers

Test name	Executions per second
✓ Reduce (reuse object)	2,364 Ops/sec
Map	1,733 Ops/sec
Object.fromEntries	1,369 Ops/sec
Reduce (assigning into reused object)	289 Ops/sec
Reduce (recreating object)	97 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; return acc; }, {});
Reduce (recreating object)
Object.entries(data).reduce((acc, [k, v]) => ({ ...acc, [k]: v }), {});
Map
Object.entries(data).reduce((acc, [k, v]) => { acc.set(k, v) return acc; }, new Map());
Reduce (assigning into reused object)
Object.entries(data).reduce((acc, [k, v]) => Object.assign(acc, { [k]: v }), {});