Run results for: Object creation from property array, manual vs Object.fromEntries

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser: Chrome 124

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Manual

20K/s

Object.fromEntries

4K/s

Object.fromEntries and Array.map

3K/s

View exact numbers

Test name	Executions per second
✓ Manual	20,040 Ops/sec
Object.fromEntries	3,651 Ops/sec
Object.fromEntries and Array.map	3,354 Ops/sec

Script Preparation code:

var properties = Array.from({ length: 1000 }, () => [Math.random().toString(), Math.random()])

Tests:

Manual
const result = {} for (const [key, value] of properties) { result[key] = value + 1 }
Object.fromEntries
const result = Object.fromEntries(properties)
Object.fromEntries and Array.map
const result = Object.fromEntries(properties.map(([key,value]) => [key, value + 1]))