입력값                                                                                                       출력값                                                                                                                           

var intArray = [1, 7, 2, 4, 3, 6, 4]                                                                       [1, 7, 2, 4, 3, 6, 4]

var stringArray = ["가", "나", "다"]                                                                  ["가", "나", "다"]

intArray.sort(by:>)                                                                                             [7, 6, 4, 4, 3, 2, 1]

intArray                                                                                                              [7, 6, 4, 4, 3, 2, 1]

intArray.sort(by:<)                                                                                             [1, 2, 3, 4, 4, 6, 7]

intArray                                                                                                              [1, 2, 3, 4, 4, 6, 7]

//위에서 intArray의  출력값을 보면 원래의 출력 [1, 7, 2, 4, 3, 6, 4]와는 다른 값이 출력되었습니다.

//따라서 파괴적 메서드(자기 자신을 변화시키는 메서드)라고 합니다.

intArray.sorted(by:>)                                                                                         [7, 6, 4, 4, 3, 2, 1]

intArray                                                                                                              [1, 7, 2, 4, 3, 6, 4]

intArray.sorted(by:<)                                                                                         [1, 2, 3, 4, 4, 6, 7]

intArray                                                                                                              [1, 7, 2, 4, 3, 6, 4]

//위의 intArray의 출력값을 보면 원래의 출력[1, 7, 2, 3, 4, 6, 4]과 동일한 값이 출력되었습니다.

//따라서 비파괴적 메서드(자기 자신을 변화시키지 않는 메서드)라고 합니다.

var intArray = [1, 7, 2, 4, 3, 6, 4]                                                                       [1, 7, 2, 4, 3, 6, 4]

var stringArray = ["가", "나", "다"]                                                                  ["가", "나", "다"]

//그런데 sorted를 쓰면 어떤 값으로 변화를 줘도 intArray에서는 원래 값으로 출력됩니다.

//변화된 값을 그대로 출력할 수는 없을까요?

var sortedA = intArray.sorted(by:>)                                                                   [7, 6, 4, 4, 3, 2, 1]

var sortedB = intArray.sorted(by:<)                                                                   [1, 2, 3, 4, 4, 6, 7]

sortedA                                                                                                               [7, 6, 4, 4, 3, 2, 1]

sortedB                                                                                                               [1, 2, 3, 4, 4, 6, 7]

//메서드를 위처럼 바꿔주면 변화된 값 그대도 출력됩니다.