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[Algorithm] 문자열 다루기 기본 #51

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hwangJi-dev opened this issue Jan 3, 2023 · 0 comments
Closed

[Algorithm] 문자열 다루기 기본 #51

hwangJi-dev opened this issue Jan 3, 2023 · 0 comments

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@hwangJi-dev
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hwangJi-dev commented Jan 3, 2023

💬 문제

[코딩테스트 연습 - 문자열 다루기 기본](https://school.programmers.co.kr/learn/courses/30/lessons/12918)


💬 풀이

func solution(_ s:String) -> Bool {
    return (s.count == 4 || s.count == 6) && s.allSatisfy({ $0.isNumber })
}

💬 알게된 문법

  • allSatisfy

    // allSatisfy({ $0.isLowercase })
    // allSatisfy({ $0.isUppercase })
    // allSatisfy({ $0.isWhitespace })
  • Int 형변환을 해서 nil이 나오면 정수로 이루어진 문자열이 아니다.

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