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

A utility library for TypeScript.

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

//#region src/set/removeOrElse.ts
/**
* `removeOrElse(target, value, orElse)`
*
* Removes a `value` from the `target` set and returns a new set. If the value doesn't exist in the set, calls the `orElse` function with the target set and returns its result.
*
* ```ts
* removeOrElse(new Set([1, 2, 3]), 2, (set) => set.size); // Set([1, 3])
* removeOrElse(new Set([1, 2, 3]), 4, (set) => set.size); // 3
* ```
*
* ```ts
* pipe(
*     new Set([1, 2, 3]),
*     removeOrElse(2, (set) => set.size),
* ); // Set([1, 3])
*
* pipe(
*     new Set([1, 2, 3]),
*     removeOrElse(4, (set) => set.size),
* ); // 3
* ```
*/
const removeOrElse = dfdlT((target, value, orElse) => {
	if (!target.has(value)) return orElse(target);
	const result = cloneSet(target);
	result.delete(value);
	return result;
}, 3);

//#endregion
export { removeOrElse };