Run results for: Object.fromEntries vs reduce vs reduce-keys

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36

Browser: Chrome 93

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Object.fromEntries	152.0 Ops/sec
Reduce (reuse object)	1001.7 Ops/sec
Reduce (creating temporary objects)	37.4 Ops/sec
Reduce (reuse object) + Object.keys()	814.6 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() }), {});
Reduce (reuse object) + Object.keys()
Object.keys(data).reduce((acc, k) => { acc[k] = data[k].toString(); return acc; }, {});