diff.js

const arraysDiff = (first, second, key) => {
	const keysInFirst = first.reduce((acc, item) => {
		const id = item[key];

		acc[id] = item;

		return acc;
	}, {});

	const { common, added } = second.reduce(
		(acc, item) => {
			const id = item[key];

			const isExist = keysInFirst[id];

			if (isExist) {
				keysInFirst[id] = null;
				acc.common.push(item);
			} else {
				acc.added.push(item);
			}

			return acc;
		},
		{ common: [], added: [] }
	);

	const removed = Object.keys(keysInFirst).reduce((acc, key) => {
		const item = keysInFirst[key];
		if (item == null) {
			return acc;
		}

		acc.push(item);

		return acc;
	}, []);

	return {
		removed,
		common,
		added,
	};
};