Table of contents

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• Collectors.tolist() -> Collects into a List

• Collectors.toSet() -> Collects into a Set

• Collectors.toMap(keyMapper, valueMapper) -> Collects into a Map
• Collectors.groupingBy(Function) -> Groups elements by a key
• Collectors.partitioningBy(Predicate) —> Partitions elements into two groups
  (true/false)

List<String> names = List.of("Alice", "Bob", "Charlie");

Map<Integer, List<String>> groupedByLength = names.stream()
                                                  .collect(Collectors.groupingBy(String: :length));