Run results for: Merge+object.keys vs set vs for

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 130

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Merge

1.7M/s

For

1.2M/s

Set

762K/s

View exact numbers

Script Preparation code:

const a = { a: 1, b: 2 };
const b = { b: 3, c: 4 };

Tests:

Set
const s = new Set([ ...Object.keys(a), ...Object.keys(b), ]); const res = Array.from(s);
Merge
const c = { ...a, ...b }; const res = Object.keys(c);
For
const s = new Set(); for(const x in a) s.add(x); for(const x in b) s.add(x); const res = Array.from(s);