@monstermann/fn/dist/object/mapAssign.js

A utility library for TypeScript.

import { merge } from "./merge.js";
import { dfdlT } from "@monstermann/dfdl";

//#region src/object/mapAssign.ts
/**
* `mapAssign(target, map)`
*
* Merges `target` object with the result of calling `map` function on `target`, creating a new object.
*
* Looser version of `mapMerge` - `mapAssign` allows you to redefine keys and add new properties.
*
* ```ts
* mapAssign({ a: 1, b: 2 }, (obj) => ({ c: obj.a + obj.b })); // { a: 1, b: 2, c: 3 }
* ```
*
* ```ts
* pipe(
*     { a: 1, b: 2 },
*     mapAssign((obj) => ({ c: obj.a + obj.b })),
* ); // { a: 1, b: 2, c: 3 }
* ```
*/
const mapAssign = dfdlT((target, map) => {
	return merge(target, map(target));
}, 2);

//#endregion
export { mapAssign };