Benchmark: Object.defineProperty vs Object.assign vs =

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${value}`]: value }), {});
assign immutable ...
const output = input.reduce((acc, value) => { ...acc, `key${value}: value } , {});

Rendered benchmark preparation results:

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Object.defineProperty vs Object.assign vs = (version: 0)