Run results for: Object.fromEntries vs reduce

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; SM-N975U) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.116 Mobile Safari/537.36 EdgA/46.02.4.5147

Browser: Chrome Mobile 77

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
Object.fromEntries	75.2 Ops/sec
Reduce (reuse object)	676.4 Ops/sec
Reduce (creating temporary objects)	10.8 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() }), {});

Run results for: Object.fromEntries vs reduce

Object.fromEntries

Reduce (reuse object)

Reduce (creating temporary objects)