Run results for: Object.defineProperty vs Object.assign vs key set

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Key set

175K/s

Object.defineProperty

58K/s

Object.assign (mutable)

58K/s

Object.assign (immutable)

2K/s

View exact numbers

Script Preparation code:

var input = new Array(100).fill().map((v, i) => i)

Tests:

Object.defineProperty
const output = input.reduce((acc, value) => Object.defineProperty(acc, `key${value}`, { value }), {});
Object.assign (immutable)
const output = input.reduce((acc, value) => Object.assign({}, acc, { [`key${value}`]: value }), {});
Object.assign (mutable)
const output = input.reduce((acc, value) => Object.assign(acc, { [`key${value}`]: value }), {});
Key set
const output = input.reduce((acc, value) => { acc[`key${value}`] = value; return acc; }, {});