@rbxts/jsnatives

Object.fromEntries

Transforms a list of key-value pairs into an object.

Signature

function fromEntries<P extends readonly [string | number | symbol, unknown]>(
  i: ReadonlyArray<P>,
) => Reconstruct<
  UnionToIntersection<
    P extends unknown ? { [k in P[0]]: P[1]; } : never
  >
>

Description

The Object.fromEntries() method transforms a list of key-value pair arrays into an object. This is the reverse operation of Object.entries().

The method takes an iterable of key-value pairs and returns a new object whose properties are given by those entries.

Examples

Basic usage

const entries = [["a", 1], ["b", 2], ["c", 3]];
const obj = Object.fromEntries(entries);

print(obj); // {a: 1, b: 2, c: 3}

Creating objects with complex values

const nestedEntries = [
  ["user", {name: "Alice", role: "Admin"}],
  ["settings", {theme: "dark", notifications: true}],
  ["stats", [10, 20, 30]]
];

const complexObj = Object.fromEntries(nestedEntries);
print(complexObj.user.name); // "Alice"
print(complexObj.settings.theme); // "dark"
print(complexObj.stats[1]); // 20

Type inference

// TypeScript can infer the resulting object type
const typedEntries = [
  ["id", 1],
  ["name", "Product"],
  ["inStock", true]
] as const;

const product = Object.fromEntries(typedEntries);
// product has type { id: number; name: string; inStock: boolean }