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

A utility library for TypeScript.

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

//#region src/set/add.ts
/**
* `add(target, value)`
*
* Adds a `value` to the `target` set and returns a new set.
*
* ```ts
* add(new Set([1, 2]), 3); // Set([1, 2, 3])
* add(new Set([1, 2]), 2); // Set([1, 2])
* ```
*
* ```ts
* pipe(new Set([1, 2]), add(3)); // Set([1, 2, 3])
* pipe(new Set([1, 2]), add(2)); // Set([1, 2])
* ```
*/
const add = dfdlT((target, value) => {
	if (target.has(value)) return target;
	target = cloneSet(target);
	target.add(value);
	return target;
}, 2);

//#endregion
export { add };