Run results for: Object.defineProperty vs Object.assign vs Object spread

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0

Browser: Firefox 121

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Object.defineProperty

76K/s

Object.assign (mutable)

49K/s

Object spread

7K/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${value}`, { value }), {});
Object spread
const output = input.reduce((acc, value) => ({ ...acc, [`key${value}`]: value }));
Object.assign (mutable)
const output = input.reduce((acc, value) => Object.assign(acc, { [`key${value}`]: value }), {});