Run results for: Object.fromEntries vs reduce (small dataset)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser: Chrome 119

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Reduce (reuse object)

605K/s

Object.fromEntries (with transform data)

521K/s

Reduce (creating temporary objects)

244K/s

View exact numbers

Test name	Executions per second
✓ Reduce (reuse object)	605,468 Ops/sec
Object.fromEntries (with transform data)	520,642 Ops/sec
Reduce (creating temporary objects)	243,568 Ops/sec

Script Preparation code:

var data = Array.from(Array(50).keys());

Tests:

Object.fromEntries (with transform data)
const createObject = (value) => ({ arbitraryKey: value }); Object.fromEntries(data.map((key, value) => { const newValue = createObject(value); return [key, newValue]; }));
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() }), {});