Run results for: Object.fromEntries vs reduce object.assign

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Reduce (object assign)

197/s

Object.fromEntries

183/s

Reduce (creating temporary objects)

0/s

View exact numbers

Test name	Executions per second
✓ Reduce (object assign)	197 Ops/sec
Object.fromEntries	183 Ops/sec
Reduce (creating temporary objects)	0 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 (object assign)
Object.entries(data).reduce((object, [key, value]) => Object.assign(object, { [key]: value }), {})
Reduce (creating temporary objects)
Object.entries(data).reduce((acc, [k, v]) => ({ ...acc, [k]: v.toString() }), {});