Run results for: Reflect.set vs Object.assign vs Direct assignment

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/131.0.6778.154 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 131

Operating system: iOS 17.6.1

Device Platform: Mobile

Date tested: one year ago

Reflect.set

42K/s

Direct assignment

31K/s

Object.assign

228/s

View exact numbers

Test name	Executions per second
✓ Reflect.set	42,088 Ops/sec
Direct assignment	31,452 Ops/sec
Object.assign	228 Ops/sec

Script Preparation code:

var numbers = Array(1000).fill(null).map((x, i) => i.toString());

Tests:

Reflect.set
numbers.reduce((acc, n) => Reflect.set(acc, n, n) && acc, {});
Object.assign
numbers.reduce((acc, n) => Object.assign(acc, { [n]: n }), {});
Direct assignment
numbers.reduce((acc, n) => { acc[n] = n; return acc }, {});