package tools

func ListToMap[K comparable, S any](list []S, keyFunc func(S) K) map[K]S {
	if len(list) == 0 {
		return make(map[K]S)
	}
	result := make(map[K]S, len(list))
	for _, item := range list {
		key := keyFunc(item)
		result[key] = item
	}
	return result
}
func SliceToMapList[K comparable, V any](slice []V, keyFunc func(V) K) map[K][]V {
	result := make(map[K][]V)
	for _, v := range slice {
		key := keyFunc(v)
		if _, ok := result[key]; !ok {
			result[key] = make([]V, 0)
			result[key] = append(result[key], v)
		} else {
			result[key] = append(result[key], v)
		}
	}
	return result
}