Run results for: Object.fromEntries performance test CR hello world unique name madafaka

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36

Browser: Chrome 139

Operating system: Linux

Device Platform: Desktop

Date tested: 10 months ago

Reduce (reuse object)

7K/s

Object.fromEntries

2K/s

Reduce (creating temporary objects)

60/s

View exact numbers

Test name	Executions per second
✓ Reduce (reuse object)	6,666 Ops/sec
Object.fromEntries	2,107 Ops/sec
Reduce (creating temporary objects)	60 Ops/sec

Script Preparation code:

var data = { ...Array.from(Array(10000).keys()) };

Tests:

Object.fromEntries
Object.fromEntries(Object.keys(data).map((key) => [key, null]));
Reduce (reuse object)
Object.keys(data).reduce((acc, key) => { acc[key] = null; return acc; }, {});
Reduce (creating temporary objects)
Object.keys(data).reduce((acc, key) => ({ ...acc, [key]: null }), {});