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

A utility library for TypeScript.

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

//#region src/set/symmetricDifference.ts
/**
* `symmetricDifference(target, source)`
*
* Returns a new set containing values that exist in either the `target` set or the `source` set, but not in both (exclusive or).
*
* ```ts
* symmetricDifference(new Set([1, 2, 3]), new Set([3, 4, 5])); // Set([1, 2, 4, 5])
* symmetricDifference(new Set([1, 2]), new Set([3, 4])); // Set([1, 2, 3, 4])
* ```
*
* ```ts
* pipe(new Set([1, 2, 3]), symmetricDifference(new Set([3, 4, 5]))); // Set([1, 2, 4, 5])
* pipe(new Set([1, 2]), symmetricDifference(new Set([3, 4]))); // Set([1, 2, 3, 4])
* ```
*/
const symmetricDifference = dfdlT((target, source) => {
	if (source.size === 0) return target;
	if (target.size === 0) return source;
	let hasChanges = false;
	for (const a of target) if (!source.has(a)) {
		hasChanges = true;
		break;
	}
	if (!hasChanges) {
		for (const b of source) if (!target.has(b)) {
			hasChanges = true;
			break;
		}
	}
	if (!hasChanges) return /* @__PURE__ */ new Set();
	const result = /* @__PURE__ */ new Set();
	for (const a of target) if (!source.has(a)) result.add(a);
	for (const b of source) if (!target.has(b)) result.add(b);
	return result;
}, 2);

//#endregion
export { symmetricDifference };