Run results for: Reduce vs Object.assign vs Object.fromEntries

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

From Entries

33K/s

Reduce

26K/s

Map Filter Reduce Assign

25/s

View exact numbers

Test name	Executions per second
✓ From Entries	32,851 Ops/sec
Reduce	25,599 Ops/sec
Map Filter Reduce Assign	25 Ops/sec

Script Preparation code:

function createArray(propsCount) {
    const arr = []
    for (let i = 0; i < propsCount; i += 1) {
        arr.push({
            active: i % 5 === 0
        })
    }
    return arr
}

var users = createArray(1000)

Tests:

Reduce
users.reduce((acc, curr) => { if (curr.active) { return acc } return { ...acc, [curr.id]: curr.name } })
Map Filter Reduce Assign
users.filter((user) => !user.active).map((user) => ({ [user.id]: user.name })).reduce(Object.assign, {})
From Entries
const a = users.filter((user) => !user.active).map((user) => [user.id, user.name]) Object.fromEntries(a)