김주희) 필수과제 + 도전문제 2,3번 풀이입니다.

README.md

@@ -1 +1,90 @@
-## 내일배움캠프 2주차 과제입니다.
+# Swift 과제 정리
+
+Swift 기본 문법을 연습하면서 작성한 과제 풀이 코드입니다.  
+클로저, 고차함수, 제네릭, 프로토콜, 에러 처리까지 직접 구현해봤습니다.
+
+---
+
+## 📁 프로젝트 구성
+
+- `main.swift`  
+  Playground / Command Line Tool 환경에서 실행 가능한 단일 파일
+
+---
+
+## ✅ 과제 1: 클로저 (Closure)
+
+- `(Int, Int) -> String` 타입의 클로저 정의
+- 클로저를 파라미터로 받아 호출하는 함수 구현
+
+---
+
+## ✅ 과제 2: 고차함수 (map / filter)
+
+- `map`으로 타입 변환
+- `filter` + `map` 체이닝
+- 클로저를 받아 동작하는 커스텀 `map` 구현
+
+---
+
+## ✅ 과제 3: 제네릭 (Generic)
+
+- Int / String 배열에서 동일한 로직을 타입별로 구현
+- 제네릭으로 공통 로직 통합
+- `Numeric` 제약을 걸어 특정 타입만 받도록 처리
+
+---
+
+## ✅ 과제 4: 프로토콜 & 타입 캐스팅
+
+### Introducible 프로토콜
+
+- `name` 프로퍼티
+- `introduce()` 메서드 요구
+
+### 구현 타입
+
+- `Robot / Cat / Dog`
+
+### 확인한 내용
+
+- 프로토콜 타입 배열에 담으면 프로토콜에 정의된 멤버만 접근 가능
+- 구체 타입의 기능은 다운캐스팅 후 사용 가능
+
+---
+
+## ✅ 과제 5: 에러 처리 (throws)
+
+- enum + associated value로 에러 케이스 정의
+- throwing 함수 구현
+- do–try–catch로 상황별 분기 처리
+
+---
+
+## 🚀 도전 과제 2: 제네릭 제약 + 조건부 메서드
+
+- `SortableBox<T>` 제네릭 구조체 구현 (`items: [T]`)
+- `T: Comparable`일 때만 `sortItems()`가 보이도록 확장
+- Comparable이 아닌 타입은 `sortItems()` 호출 시 컴파일 오류로 막히는 것 확인
+
+---
+
+## 🚀 도전 과제 3: 프로토콜 기본 구현
+
+- `Introducible` extension에서 기본 `introduce()` 제공
+- `Cat`, `Dog`는 `introduce()` 구현 없이 기본 동작 사용
+- `Robot`은 기본 동작 대신 커스텀 `introduce()` 구현
+
+---
+
+## ▶️ 실행 방법
+
+- Xcode Playground 또는 Command Line Tool 프로젝트에서  
+  `main.swift` 실행
+
+---
+
+## 🙋‍♀️ 작성자
+
+- 김주희  
+- 내일배움캠프 iOS 9기 `🤓왜_되는지_증명못함` 팀

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