@monstermann/fn/dist/map/isShallowEqual.js

A utility library for TypeScript.

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

//#region src/map/isShallowEqual.ts
/**
* `isShallowEqual(map, source)`
*
* Checks if `map` is shallow equal to `source` by comparing their keys and values using strict equality.
*
* ```ts
* isShallowEqual(
*     new Map([
*         ["a", 1],
*         ["b", 2],
*     ]),
*     new Map([
*         ["a", 1],
*         ["b", 2],
*     ]),
* ); // true
*
* isShallowEqual(
*     new Map([
*         ["a", 1],
*         ["b", 2],
*     ]),
*     new Map([
*         ["a", 1],
*         ["b", 3],
*     ]),
* ); // false
* ```
*
* ```ts
* pipe(
*     new Map([
*         ["a", 1],
*         ["b", 2],
*     ]),
*     isShallowEqual(
*         new Map([
*             ["a", 1],
*             ["b", 2],
*         ]),
*     ),
* ); // true
*
* pipe(
*     new Map([
*         ["a", 1],
*         ["b", 2],
*     ]),
*     isShallowEqual(
*         new Map([
*             ["a", 1],
*             ["b", 3],
*         ]),
*     ),
* ); // false
* ```
*/
const isShallowEqual = dfdlT((target, source) => {
	if (target.size !== source.size) return false;
	const seen = /* @__PURE__ */ new Set();
	for (const k of target.keys()) {
		seen.add(k);
		if (!source.has(k)) return false;
		if (target.get(k) !== source.get(k)) return false;
	}
	for (const k of source.keys()) {
		if (seen.has(k)) continue;
		if (!target.has(k)) return false;
		if (target.get(k) !== source.get(k)) return false;
	}
	return true;
}, 2);

//#endregion
export { isShallowEqual };