<dependency> <groupId>com.github.javadev</groupId> <artifactId>underscore-java</artifactId> <version>1.69</version> </dependency> List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5); List<Integer> evens = _.filter(numbers, n -> n % 2 == 0); List<Integer> squares = _.map(numbers, n -> n * n); List<Integer> sorted = _.sortBy(numbers, n -> n); Integer[] numbers = {1, 2, 3, 4, 5}; int sum = _.reduce(numbers, (acc, n) -> acc + n, 0); Optional<Integer> found = _.find(numbers, n -> n == 3); String[] texts = _.map(numbers, n -> "Number: " + n); _.config().setNullSafe(false); _.config().setLogLevel(Config.LogLevel.DEBUG);