Run results for: Object.fromEntries vs reduce vs forEach

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; HD1903) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.74 Mobile Safari/537.36

Browser: Chrome Mobile 95

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Script Preparation code:

var data = Array.from(Array(10000).keys());

Tests:

1. Assign with forEach
let ret = {}; data.forEach(v => { ret[v] = v + 1; });
2. Object.fromEntries
Object.fromEntries(data.map((v) => [v, v + 1]));
3. reduce (reuse object)
data.reduce((acc, v) => { acc[v] = v + 1; return acc; }, {});
4. reduce (reuse object 2)
data.reduce((acc, v) => (acc[v] = v + 1, acc), {})
5. reduce (temporary object 1)
data.reduce((acc, v) => Object.assign(acc, {[v]: v + 1}), {});
6. reduce (temporary object 2)
data.reduce((acc, v) => ({...acc, [v]: v + 1}), {});