Run results for: index by id: Object.fromEntries vs reduce

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Object.fromEntries	8003.6 Ops/sec
Array.prototype.reduce	10212.3 Ops/sec

Script Preparation code:

var array = Array.from({
    length: 1000
}, () => ({
    id: Math.random() * 100000 | 0,
    key1: Math.random() * 100000 | 0,
    key2: Math.random() * 100000 | 0,
    key3: Math.random() * 100000 | 0,
    key4: Math.random() * 100000 | 0
}))

Tests:

Object.fromEntries
Object.fromEntries(array.map(item => [item.id, item]))
Array.prototype.reduce
array.reduce((acc, val) => { acc[val.id] = val; return acc; }, {})

Run results for: index by id: Object.fromEntries vs reduce

Object.fromEntries

Array.prototype.reduce