@monstermann/fn/dist/set/addAll.js

A utility library for TypeScript.

import { dfdlT } from "@monstermann/dfdl";
import { cloneSet } from "@monstermann/remmi";

//#region src/set/addAll.ts
/**
* `addAll(target, values)`
*
* Adds all `values` from an iterable to the `target` set and returns a new set.
*
* ```ts
* addAll(new Set([1, 2]), [3, 4]); // Set([1, 2, 3, 4])
* addAll(new Set([1, 2]), [2, 3]); // Set([1, 2, 3])
* ```
*
* ```ts
* pipe(new Set([1, 2]), addAll([3, 4])); // Set([1, 2, 3, 4])
* pipe(new Set([1, 2]), addAll([2, 3])); // Set([1, 2, 3])
* ```
*/
const addAll = dfdlT((target, values) => {
	let result;
	for (const value of values) {
		if (target.has(value)) continue;
		result ??= cloneSet(target);
		result.add(value);
	}
	return result ?? target;
}, 2);

//#endregion
export { addAll };