List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5); List<Integer> evenSquares = _.chain(numbers) .filter(n -> n % 2 == 0) .map(n -> n * n) .value(); List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5); int sum = _.reduce(numbers, (acc, n) -> acc + n, 0); List<String> names = Arrays.asList("Alice", "Bob", "Charlie", "David"); List<String> longNames = _.filter(names, name -> name.length() > 5); List<String> names = null; List<String> filteredNames = _.filter(names, name -> name.length() > 5); List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5); int sum = _.chain(numbers) .map(n -> n * n) .filter(n -> n % 2 == 0) .reduce((acc, n) -> acc + n) .value();