Java 8: Group a list with Collectors.groupingBy

record Person(String name, String city) {}
List<Person> people = List.of(
        new Person("Ava", "NYC"), new Person("Ben", "LA"),
        new Person("Cara", "NYC"));

Map<String, List<String>> byCity = people.stream()
        .collect(Collectors.groupingBy(
                Person::city,
                Collectors.mapping(Person::name, Collectors.toList())));
System.out.println(byCity);

{NYC=[Ava, Cara], LA=[Ben]}