Run results for: Object.fromEntries vs reduce vs assign

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0

Browser: Firefox 118

Operating system: Windows

Device Platform: Desktop

Date tested: 7 months ago

Test name	Executions per second
Object.fromEntries	232.8 Ops/sec
Reduce (reuse object)	1021.5 Ops/sec
Reduce (creating temporary objects)	0.2 Ops/sec
Object.assign	139.1 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() }), {});
Object.assign
Object.assign({}, ...Object.entries(data).map(([k,v]) => ({[k]:v.toString()})))