// prettier-ignore

export function groupBy<T, K extends keyof any>(
	arr: T[],
	key: (i: T) => K,
): Record<K, T[]> {
	return arr.reduce(
		(groups, item) => {
			// biome-ignore lint/suspicious/noAssignInExpressions: <explanation>
			(groups[key(item)] ||= []).push(item);
			return groups;
		},
		{} as Record<K, T[]>,
	);
}