export const groupBy = <T>(
	array: T[],
	predicate: (value: T, index: number, array: T[]) => string,
) =>
	array.reduce(
		(acc, value, index, array) => {
			(acc[predicate(value, index, array)] ||= []).push(value);
			return acc;
		},
		{} as { [key: string]: T[] },
	);

export const groupByToMap = <T, Q>(
	array: T[],
	predicate: (value: T, index: number, array: T[]) => Q,
) =>
	array.reduce((map, value, index, array) => {
		const key = predicate(value, index, array);
		map.get(key)?.push(value) ?? map.set(key, [value]);
		return map;
	}, new Map<Q, T[]>());