feat: apply lambda, stream, Optional #1
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this-is-spear
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this-is-spear
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늦게 리뷰드려서 죄송합니다. 😿
이번 미션을 진행하면서 저도 많이 배웠던 것 같아요!
이번 미션 수고 많으셨습니다. 🙇♂️
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| public interface Conditional { | ||
| boolean test(Integer number); | ||
| } |
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Condition 인터페이스를 내부에 선언하신 이유가 있으실까요?
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그리고 test 말고도 좋은 메서드 이름이 있을 것 같아요!
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| public static int sumAllEven(List<Integer> numbers) { | ||
| int total = 0; | ||
| for (int number : numbers) { | ||
| if (number % 2 == 0) { | ||
| total += number; | ||
| } | ||
| } | ||
| return total; | ||
| return sumAll(numbers, (integer)->{return integer%2==0;}); | ||
| } | ||
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| public static int sumAllOverThree(List<Integer> numbers) { | ||
| int total = 0; | ||
| for (int number : numbers) { | ||
| if (number > 3) { | ||
| total += number; | ||
| } | ||
| } | ||
| return total; | ||
| return sumAll(numbers, (integer)->{return integer>3;}); |
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조건들도 메서드로 선언해서 깔끔하게 관리하는 것도 좋아보여요!
| List<String> words = Arrays.asList(contents.split("[\\P{L}]+")); | ||
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| // TODO 이 부분에 구현한다. | ||
| words.stream().filter(w -> w.length() > 12).sorted(Comparator.comparing(String::length).reversed()).distinct().limit(100).map(String::toLowerCase).forEach(System.out::println); |
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이 방식으로 조건들을 한 번에 해결할 수 있군요! 멋집니다. 👍
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| public static boolean ageIsInRange2(User user) { | ||
| return false; | ||
| return Optional.ofNullable(user).map(x -> x.getAge()).filter(x -> x >=30 && x <= 45).isPresent(); |
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람다를 추가적으로 사용할 수 있습니다.
Suggested change
| return Optional.ofNullable(user).map(x -> x.getAge()).filter(x -> x >=30 && x <= 45).isPresent(); | |
| return Optional.ofNullable(user).map(User::getAge).filter(x -> x >=30 && x <= 45).isPresent(); |
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x >=30 && x <= 45와 같은 조건을 의미있는 이름으로 메서드를 만들면 가독성이 더 좋을 것 같아요!
| return true; | ||
| } | ||
| }); | ||
| Car actual = car.move(() -> {return true;}); |
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Suggested change
| Car actual = car.move(() -> {return true;}); | |
| Car actual = car.move(() -> true); |
| return false; | ||
| } | ||
| }); | ||
| Car actual = car.move(() ->{return false;}); |
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Suggested change
| Car actual = car.move(() ->{return false;}); | |
| Car actual = car.move(() -> false); |
| } | ||
| } | ||
| return DEFAULT_USER; | ||
| return users.stream().filter(user -> user.matchName(name)).findAny().orElse(DEFAULT_USER); |
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findAny() 메서드를 사용하신 이유가 있을까요?
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