Run results for: Object.fromEntries vs reduce vs Map edited

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 26_5_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) GSA/426.7.931869700 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 26

Operating system: iOS 26.5.0

Device Platform: Mobile

Date tested: 8 days ago

Reduce (reuse object)

961/s

Map

845/s

Reduce (creating temporary objects)

0/s

View exact numbers

Test name	Executions per second
✓ Reduce (reuse object)	961 Ops/sec
Map	845 Ops/sec
Reduce (creating temporary objects)	0 Ops/sec

Script Preparation code:

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

Tests:

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]) => { return {...acc, [k]: v.toString()} }, {});
Map
Object.entries(data).reduce((acc, [k, v]) => { acc.set(k, v.toString()) return acc; }, new Map());