Run results for: Convert Array to Object 2 - Object.fromEntries vs reduce vs forEach

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36

Browser: Chrome 112

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Object.fromEntries	957.6 Ops/sec
Reduce (reuse object)	6103.1 Ops/sec
Reduce (creating temporary objects)	35.8 Ops/sec
for of	7116.3 Ops/sec
for each	6122.3 Ops/sec

Script Preparation code:

var data = Array.from(Array(10000).keys()).map(i => ({id: i, value: `val_${i}`}));

Tests:

Object.fromEntries
Object.fromEntries(data.map(obj => [obj.id, obj]));
Reduce (reuse object)
data.reduce((acc, obj) => { acc[obj.id] = obj; return acc; }, {});
Reduce (creating temporary objects)
data.reduce((acc, obj) => ({ ...acc, [obj.id]: obj }), {});
for of
const acc = {} for (const obj of data) { acc[obj.id] = obj }
for each
const acc = {} data.forEach((obj) => { acc[obj.id] = obj })