Run results for: Object from array: map + Object.fromEntries vs reduce vs Object.fromEntries(Object pairs) vs Object.fromEntries(map iterator)

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser: Chrome 136

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Reduce (reuse object)

438/s

Object.fromEntries

288/s

creating temporary objects instead of arrays

197/s

use an iterator to avoid unnecessary memory allocation

195/s

View exact numbers

Test name	Executions per second
✓ Reduce (reuse object)	438 Ops/sec
Object.fromEntries	288 Ops/sec
creating temporary objects instead of arrays	197 Ops/sec
use an iterator to avoid unnecessary memory allocation	195 Ops/sec

Script Preparation code:

var array = Array.from({ length: 10001 }, (_, index) => index);

Tests:

Object.fromEntries
Object.fromEntries(array.map((n) => [`db/path/${n}`, null]));
Reduce (reuse object)
array.reduce((acc, n) => { acc[`db/path/${n}`] = null; return acc; }, {});
creating temporary objects instead of arrays
Object.fromEntries(array.map((n) => ({0:`db/path/${n}`, 1:null})))
use an iterator to avoid unnecessary memory allocation
Object.fromEntries(array.values().map((n) => ({0:`db/path/${n}`, 1:null})))