From bf2bfb459dfe3d05540e7d251ee6982c0b099f11 Mon Sep 17 00:00:00 2001
From: ybin4548 <ybin4548@gmail.com>
Date: Thu, 8 Jan 2026 20:56:15 +0900
Subject: [PATCH 1/8] =?UTF-8?q?=EA=B0=9C=EC=9D=B8=EA=B3=BC=EC=A0=9C=20?=
 =?UTF-8?q?=EB=AC=B8=EC=A0=9C=ED=92=80=EC=9D=B4?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 chap2/chap2.xcodeproj/project.pbxproj         | 294 ++++++++
 .../contents.xcworkspacedata                  |   7 +
 .../UserInterfaceState.xcuserstate            | Bin 0 -> 18550 bytes
 .../xcschemes/xcschememanagement.plist        |  14 +
 chap2/chap2/main.swift                        | 636 ++++++++++++++++++
 5 files changed, 951 insertions(+)
 create mode 100644 chap2/chap2.xcodeproj/project.pbxproj
 create mode 100644 chap2/chap2.xcodeproj/project.xcworkspace/contents.xcworkspacedata
 create mode 100644 chap2/chap2.xcodeproj/project.xcworkspace/xcuserdata/son-yeongbin.xcuserdatad/UserInterfaceState.xcuserstate
 create mode 100644 chap2/chap2.xcodeproj/xcuserdata/son-yeongbin.xcuserdatad/xcschemes/xcschememanagement.plist
 create mode 100644 chap2/chap2/main.swift

diff --git a/chap2/chap2.xcodeproj/project.pbxproj b/chap2/chap2.xcodeproj/project.pbxproj
new file mode 100644
index 0000000..37a9612
--- /dev/null
+++ b/chap2/chap2.xcodeproj/project.pbxproj
@@ -0,0 +1,294 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 77;
+	objects = {
+
+/* Begin PBXCopyFilesBuildPhase section */
+		8AFFB8A92F0D06A500B08B3D /* CopyFiles */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = /usr/share/man/man1/;
+			dstSubfolderSpec = 0;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 1;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
+/* Begin PBXFileReference section */
+		8AFFB8AB2F0D06A500B08B3D /* chap2 */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = chap2; sourceTree = BUILT_PRODUCTS_DIR; };
+/* End PBXFileReference section */
+
+/* Begin PBXFileSystemSynchronizedRootGroup section */
+		8AFFB8AD2F0D06A500B08B3D /* chap2 */ = {
+			isa = PBXFileSystemSynchronizedRootGroup;
+			path = chap2;
+			sourceTree = "<group>";
+		};
+/* End PBXFileSystemSynchronizedRootGroup section */
+
+/* Begin PBXFrameworksBuildPhase section */
+		8AFFB8A82F0D06A500B08B3D /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		8AFFB8A22F0D06A500B08B3D = {
+			isa = PBXGroup;
+			children = (
+				8AFFB8AD2F0D06A500B08B3D /* chap2 */,
+				8AFFB8AC2F0D06A500B08B3D /* Products */,
+			);
+			sourceTree = "<group>";
+		};
+		8AFFB8AC2F0D06A500B08B3D /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				8AFFB8AB2F0D06A500B08B3D /* chap2 */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+/* End PBXGroup section */
+
+/* Begin PBXNativeTarget section */
+		8AFFB8AA2F0D06A500B08B3D /* chap2 */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 8AFFB8B22F0D06A500B08B3D /* Build configuration list for PBXNativeTarget "chap2" */;
+			buildPhases = (
+				8AFFB8A72F0D06A500B08B3D /* Sources */,
+				8AFFB8A82F0D06A500B08B3D /* Frameworks */,
+				8AFFB8A92F0D06A500B08B3D /* CopyFiles */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			fileSystemSynchronizedGroups = (
+				8AFFB8AD2F0D06A500B08B3D /* chap2 */,
+			);
+			name = chap2;
+			packageProductDependencies = (
+			);
+			productName = chap2;
+			productReference = 8AFFB8AB2F0D06A500B08B3D /* chap2 */;
+			productType = "com.apple.product-type.tool";
+		};
+/* End PBXNativeTarget section */
+
+/* Begin PBXProject section */
+		8AFFB8A32F0D06A500B08B3D /* Project object */ = {
+			isa = PBXProject;
+			attributes = {
+				BuildIndependentTargetsInParallel = 1;
+				LastSwiftUpdateCheck = 2620;
+				LastUpgradeCheck = 2620;
+				TargetAttributes = {
+					8AFFB8AA2F0D06A500B08B3D = {
+						CreatedOnToolsVersion = 26.2;
+					};
+				};
+			};
+			buildConfigurationList = 8AFFB8A62F0D06A500B08B3D /* Build configuration list for PBXProject "chap2" */;
+			developmentRegion = en;
+			hasScannedForEncodings = 0;
+			knownRegions = (
+				en,
+				Base,
+			);
+			mainGroup = 8AFFB8A22F0D06A500B08B3D;
+			minimizedProjectReferenceProxies = 1;
+			preferredProjectObjectVersion = 77;
+			productRefGroup = 8AFFB8AC2F0D06A500B08B3D /* Products */;
+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				8AFFB8AA2F0D06A500B08B3D /* chap2 */,
+			);
+		};
+/* End PBXProject section */
+
+/* Begin PBXSourcesBuildPhase section */
+		8AFFB8A72F0D06A500B08B3D /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin XCBuildConfiguration section */
+		8AFFB8B02F0D06A500B08B3D /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MACOSX_DEPLOYMENT_TARGET = 26.2;
+				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
+				MTL_FAST_MATH = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = macosx;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "DEBUG $(inherited)";
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+			};
+			name = Debug;
+		};
+		8AFFB8B12F0D06A500B08B3D /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MACOSX_DEPLOYMENT_TARGET = 26.2;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				MTL_FAST_MATH = YES;
+				SDKROOT = macosx;
+				SWIFT_COMPILATION_MODE = wholemodule;
+			};
+			name = Release;
+		};
+		8AFFB8B32F0D06A500B08B3D /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Debug;
+		};
+		8AFFB8B42F0D06A500B08B3D /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_APPROACHABLE_CONCURRENCY = YES;
+				SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		8AFFB8A62F0D06A500B08B3D /* Build configuration list for PBXProject "chap2" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				8AFFB8B02F0D06A500B08B3D /* Debug */,
+				8AFFB8B12F0D06A500B08B3D /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		8AFFB8B22F0D06A500B08B3D /* Build configuration list for PBXNativeTarget "chap2" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				8AFFB8B32F0D06A500B08B3D /* Debug */,
+				8AFFB8B42F0D06A500B08B3D /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 8AFFB8A32F0D06A500B08B3D /* Project object */;
+}
diff --git a/chap2/chap2.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/chap2/chap2.xcodeproj/project.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..919434a
--- /dev/null
+++ b/chap2/chap2.xcodeproj/project.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
diff --git a/chap2/chap2.xcodeproj/project.xcworkspace/xcuserdata/son-yeongbin.xcuserdatad/UserInterfaceState.xcuserstate b/chap2/chap2.xcodeproj/project.xcworkspace/xcuserdata/son-yeongbin.xcuserdatad/UserInterfaceState.xcuserstate
new file mode 100644
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diff --git a/chap2/chap2.xcodeproj/xcuserdata/son-yeongbin.xcuserdatad/xcschemes/xcschememanagement.plist b/chap2/chap2.xcodeproj/xcuserdata/son-yeongbin.xcuserdatad/xcschemes/xcschememanagement.plist
new file mode 100644
index 0000000..bd604b7
--- /dev/null
+++ b/chap2/chap2.xcodeproj/xcuserdata/son-yeongbin.xcuserdatad/xcschemes/xcschememanagement.plist
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>chap2.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
+	</dict>
+</dict>
+</plist>
diff --git a/chap2/chap2/main.swift b/chap2/chap2/main.swift
new file mode 100644
index 0000000..1d73ada
--- /dev/null
+++ b/chap2/chap2/main.swift
@@ -0,0 +1,636 @@
+
+/* 필수 문제 1.
+ - [ ]  두 개의 Int 값을 파라미터로 받고, 하나의 String 값을 반환하는 클로저를 설계해주세요.
+     - 클로저 내부에서는 두 정수를 더한 후, "두 수의 합은 {합계} 입니다"라는 문자열을 반환합니다.
+ - [ ]  이 클로저를 상수 sum에 저장하고, 정확한 타입을 명시해주세요.
+     
+     ```swift
+     var num: Int = 3
+     ```
+     
+ - [ ]  sum을 호출하는 코드를 작성해주세요. (파라미터로 전달하는 값은 임의로 선택)
+ - [ ]  위에서 정의한 sum과 동일한 타입의 클로저를 파라미터로 받고, 반환 값이 없는(void) 함수 calculate를 작성해주세요.
+     1. (조건) calculate 함수 구현 내에서는 파라미터로 전달받은 클로저를 호출하는 코드를 포함해야합니다.
+ */
+
+
+/* 1. 두 개의 Int 값을 파라미터로 받고, 하나의 String 값을 반환하는 클로저*/
+let closure: (Int, Int) -> String = {
+    val1, val2 in
+    return "두 수의 합은 \(val1 + val2)입니다."
+}
+//let closure: (Int, Int) -> String  = {
+//    return "두 수의 합은 \($0 + $1)입니다."
+//}
+//print(closure(10,20))
+
+/* 2. 클로저를 상수 sum에 저장하고, 정확한 타입을 명시*/
+let sum: (Int, Int) -> String = closure
+
+/* 3. sum을 호출하는 코드*/
+print(sum(10,20))
+
+/* 4. sum과 동일한 타입의 클로저를 파라미터로 받고, 반환 값이 없는(void) 함수 calculate */
+// 방법 1. 클로저만을 파라미터로 받음(고정 데이터 처리 가능)
+func calculate(calClosure: (Int, Int) -> String){
+    let result = calClosure(20,20)
+    print(result)
+}
+
+calculate(calClosure : sum)
+//방법 2. 계산 인자와 클로저를 파라미터로 받음(함수 호출 시에 인자를 지정하여 사용 가능)
+func calculate(val1 : Int, val2 :Int ,calClosure: (Int,Int)->String){
+    let result = calClosure(val1, val2)
+    print(result)
+}
+calculate(val1: 20, val2: 30, calClosure: sum)
+
+
+/* 필수 문제 2.
+ - [ ]  아래 for-in 문을 map 을 사용하는 코드로 변환해주세요.
+ 
+ ```swift
+ let numbers = [1, 2, 3, 4, 5]
+ 
+ var result = [String]()
+ 
+ for number in numbers {
+   result.append(number)
+ }
+ ```
+ 
+- [ ]  주어진 입력값을 고차함수를 체이닝하여 주어진 출력값이 나오도록 구현해주세요.
+ - 입력: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] - 타입: Array<Int>
+ - 출력: [”2”, “4”, “6”, “8”, “10”] - 타입: Array<String>
+ - 힌트
+     
+     map 과 filter 를 이용해볼 수 있을 것 같습니다.
+     
+- [ ]  이제 고차함수를 직접 만들어 봅니다.
+ - 함수명: myMap
+ - 파라미터는 2개 입니다.
+     1. 배열: [Int]
+     2. 변환 클로저: (Int) → String
+ - 반환 값은 1개 입니다.
+     1. [String]
+ - myMap 함수 구현 내부에서 map, filter, reduce 등 고차함수를 직접 사용하지 않아야합니다.
+ - 완성된 myMap 호출 예시
+     
+     ```swift
+     let result = myMap([1, 2, 3, 4, 5]) {
+         String($0)
+     }
+     
+     print(result) // ["1", "2", "3", "4", "5"]
+     ```*/
+
+/* 1. for-in -> map 변경*/
+let numbers = [1,2,3,4,5]
+var result = [String]()
+result = numbers.map{String($0)}
+print(result)
+
+/* 2. 고차함수 체이닝 */
+let num:[Int] = [1,2,3,4,5,6,7,8,9,10]
+var res:[String] = num.filter{$0 % 2 == 0}.map{String($0)}
+print(res)
+
+/* 3. 고차함수 생성 (map, filter, reduce 사용X */
+func myMap(_ arr:[Int], toStr: (Int) -> String) -> [String]{
+    var myres: [String] = []
+    for idx in arr{
+        myres.append(toStr(idx))
+    }
+    return myres
+}
+let arr2 = myMap([1,2,3,4,5]){ //result는 위에서 사용 중이라 arr2로 대체했습니다.
+    String($0)
+}
+print(arr2)
+
+
+
+/* 필수 문제 3.
+ - [ ]  Int 배열의 짝수번째 요소를 제거해서 반환하는 함수 `a` 를 작성해주세요.
+     - 테스트 입력: [1, 2, 3, 4, 5]
+     - 테스트 출력: [2, 4]
+ - [ ]  String 배열의 짝수번째 요소를 제거해서 반환하는 함수 `b` 를 작성해주세요.
+     - 테스트 입력: [”가”, “나”, “다”, “라”, “마”]
+     - 테스트 출력: [”나”, “라”]
+ - [ ]  위 두 함수를 하나의 함수로 대체할 수 있는 방법을 고민해보고, 함수 `c` 로 작성해주세요.
+ - [ ]  테스트 입력들을 넣고 호출하여 출력이 제대로 나오는지 작성해주세요.
+     - 테스트 입력: [1, 2, 3, 4, 5], [”가”, “나”, “다”, “라”, “마”]
+     - 테스트 출력: [2, 4], [”나”, “라”]
+ - [ ]  함수 `c` 를 기반으로 수정하여 함수 `d` 를 작성해주세요.
+     - 파라미터의 타입을 << 'Numeric 프로토콜'을 준수하는 타입의 요소를 가진 배열 >> 로 변경합니다.
+ */
+
+/* 1. `a` 함수 작성 */
+func a(arr: [Int])->[Int]{
+    var iArr: [Int] = []
+    for idx in 0..<arr.count{
+        if idx % 2 != 0{
+            iArr.append(arr[idx])
+        }
+    }
+    return iArr
+}
+let iArray = [1,2,3,4,5]
+print(a(arr: iArray))
+
+/* 2. `b` 함수 작성 */
+func b(arr: [String])->[String]{
+    var sArr: [String] = []
+    for idx in 0..<arr.count{
+        if idx % 2 != 0{
+            sArr.append(arr[idx])
+        }
+    }
+    return sArr
+}
+let sArray: [String] = ["가","나","다","라","마"]
+print(b(arr: sArray))
+
+/* 3. `c` 함수 작성 */
+func c<T>(arr: [T])->[T]{
+    var cArr: [T] = []
+    for idx in 0..<arr.count{
+        if idx % 2 != 0{
+            cArr.append(arr[idx])
+        }
+    }
+    return cArr
+}
+print(c(arr: iArray))
+print(c(arr: sArray))
+
+
+/* 4. `d` 함수 작성 */
+func d<T: Numeric>(arr: [T])->[T]{
+    var dArr: [T] = []
+    for idx in 0..<arr.count{
+        if idx % 2 != 0{
+            dArr.append(arr[idx])
+        }
+    }
+    return dArr
+}
+print(d(arr: iArray))
+print(d(arr: [1.0,2.0,3.0,4.0,5.0]))
+
+
+
+/* 필수 문제 4.
+ 우리는 여러 타입에 “자기소개” 기능을 부여하고자 합니다.
+
+ - [ ]  Introducible 프로토콜을 정의하세요.
+     - name: String 프로퍼티를 요구사항으로 포함합니다.
+     - introduce() -> String 메서드를 요구사항으로 포함합니다.
+         - 동작 예시: print("안녕하세요, 저는 \(name)입니다.")
+ - [ ]  Robot, Cat, Dog 타입을 정의하고 Introducible 프로토콜을 채택해주세요.
+ - [ ]  Robot 타입의 경우, name 값이 변경될 때마다 변경 이전값과 이후 값을 출력하도록 구현해주세요.
+     - 만약 변경 이전값과 이후값이 같다면 출력하지 않아야합니다.
+     - 출력 예시
+         
+         ```swift
+         name 변경 알림
+         변경 이전 값: 피규어
+         변경 이후 값: 옵티머스
+         ```
+         
+ - [ ]  Introducible 프로토콜 에 정의되지 않은 각 타입 고유의 메서드들도 하나씩 추가 정의해주세요.
+     - 예를 들어, Robot 은 충전하기(batteryCharge) 라는 메서드를 추가 할 수 있습니다.
+ - [ ]  `[Introducible]` 타입 배열을 정의하고, Robot, Cat, Dog 인스턴스 1개씩을 append 해주세요.
+     - 배열을 순회하며 각 타입 고유의 메서드들을 호출하는 코드를 작성해주세요.
+ */
+
+/* 1. Introducible 프로토콜 정의 */
+protocol Introducible{
+    var name: String {get set}
+    func introduce()->String
+}
+/* 2. Robot 정의 */
+class Robot: Introducible{
+    var name: String{
+        didSet{
+            print("name 변경 알림")
+            print("변경 이전 값: \(oldValue)")
+            print("변경 이후 값: \(name)")
+        }
+    }
+    var batterySts: Int = 50
+
+    func introduce()->String{
+        return "안녕하세요. 저는 \(name)입니다."
+    }
+    func batteryCharge(){
+        if batterySts == 100 {
+            print("배터리 충전이 완료된 상태입니다.")
+        }else {
+            batterySts += 10
+            print("배터리가 충전되었습니다.")
+        }
+        print("현재 배터리 잔량은 \(batterySts)입니다.")
+    }
+    
+    init(name: String){
+        self.name = name
+    }
+}
+/* 3. Cat 정의 */
+class Cat: Introducible{
+    var name: String
+    func introduce()->String{
+        return "안녕하세요. 저는 \(name)입니다."
+    }
+    func meow(){
+        print("고양이가 울고있습니다.")
+    }
+    init(name: String) {
+        self.name = name
+    }
+}
+/* 4. Dog 정의 */
+class Dog: Introducible{
+    var name: String
+    func introduce()->String{
+        return "안녕하세요. 저는 \(name)입니다."
+    }
+    func bark(){
+        print("개가 짖고있습니다.")
+    }
+    init(name: String) {
+        self.name = name
+    }
+}
+/* 5. robot,cat,dog 인스턴스 생성 -> append */
+var robot = Robot(name: "피규어")
+var cat = Cat(name: "고양이")
+var dog = Dog(name: "강아지")
+var arr: [Introducible] = []
+arr.append(robot)
+arr.append(cat)
+arr.append(dog)
+/* robot name 변경 */
+robot.name = "옵티머스"
+/* 배열 순회하며 고유 메서드 출력 */
+for idx in arr{
+    print(idx.introduce())
+    if let r = idx as? Robot{
+        r.batteryCharge()
+    } else if let c = idx as? Cat{
+        c.meow()
+    } else if let d = idx as? Dog{
+        d.bark()
+    }
+}
+
+
+
+/* 필수 문제 5.
+ 우리는 간단한 **택배 도착 예측 시스템**을 만들고 있다고 가정합니다.
+
+ 사용자에게 예상 도착일을 알려주려 하지만, 다음과 같은 여러 상황에서 문제가 발생할 수 있습니다:
+
+ - 주소가 잘못된 경우
+ - 배송이 아직 시작되지 않은 경우
+ - 시스템 서버 에러로 예측이 불가능한 경우
+ - [ ]  배송 상태를 표현하는 DeliveryStatus 열거형을 구현하고, 아래 3가지 상태를 포함하도록 합니다.
+     - notStarted
+     - inTransit(daysRemaining: Int)
+     - error
+ - [ ]  사용자 정의 에러 타입 DeliveryError를 Error 프로토콜을 따르도록 정의합니다.
+     - invalidAddress
+     - notStarted
+     - systemError(reason: String)
+ - [ ]  아래 시그니처를 가진 throwing function 을 구현해봅니다.
+
+     ```swift
+     func predictDeliveryDay(for address: String, status: DeliveryStatus) throws -> String
+     ```
+
+     - 주소가 빈 문자열이면 DeliveryError.invalidAddress를 던져야 합니다.
+     - 배송이 아직 시작되지 않은 경우 DeliveryError.notStarted를 던져야 합니다.
+     - 시스템 에러 상태면 DeliveryError.systemError(reason:)을 던져야 합니다.
+     - 나머지 경우에는 "배송까지 X일 남았습니다." 형태의 문자열을 반환합니다.
+ - [ ]  위 함수를 do-catch 로 호출하고, 각 에러 상황에 따라 사용자에게 다른 메시지를 출력하세요.
+ */
+
+
+/* 1.DeliveryStatus Enum 구현 */
+enum DeliveryStatus {
+    case notStarted
+    case inTransit(daysRemaining: Int)
+    case error
+    
+}
+/* 2. DeliveryError 구현(Error Protocol) */
+enum DeliveryError: Error{
+    case invalidAddress
+    case notStarted
+    case systemError(reason: String)
+}
+/* 3. throwing function 구현 */
+func predictDeliveryDay(for address: String, status: DeliveryStatus) throws -> String{
+    if address.isEmpty{
+        throw DeliveryError.invalidAddress
+    }
+    switch status{
+    case .notStarted:
+        throw DeliveryError.notStarted
+    case .error:
+        throw DeliveryError.systemError(reason: "시스템에 오류가 있습니다.")
+    case .inTransit(daysRemaining: let days):
+        return "배송까지 \(days)일 남았습니다."
+    }
+}
+/* 4. do-catch로 호출 */
+do{
+    let result = try predictDeliveryDay(for:"" ,status: .inTransit(daysRemaining: 3))
+    print(result)
+} catch DeliveryError.invalidAddress{
+    print("주소가 입력되지 않았습니다.")
+} catch DeliveryError.notStarted{
+    print("배송이 아직 시작되지 않았습니다.")
+} catch DeliveryError.systemError(reason: let reason){
+    print("오류: \(reason)")
+}
+
+
+
+/* 도전 문제 1.
+ - ‘자동차’ 라는 개념을 가지고 객체 지향 설계를 해봅니다.
+     - [ ]  Base Class `Car` 를 설계해주세요.
+         - 4가지의 상태를 정의해주세요.
+             - 브랜드, 모델, 연식
+                 - 모두 String 타입입니다.
+             - 엔진
+                 - Engine 이라는 커스텀 타입으로 정의해주세요.
+         - 1개의 동작을 정의해주세요.
+             - 운전하기
+                 - 동작 예시) “Car 주행 중…”  출력
+         - 추가하고 싶은 상태와 동작은 마음껏 추가해주세요.
+             - stop(), charge(), refuel() 등..
+         - 정의한 각 상태 및 동작에 적절한 접근 제어자를 명시적으로 지정해주세요.
+     - [ ]  `Car` 를 상속한 `ElectricCar` 를 설계해주세요.
+         - ElectricEngine 타입의 Engine 을 사용해야합니다.
+     - [ ]  `Car` 를 상속한 `HybridCar` 를 설계해주세요.
+         - 새로운 엔진 타입 `HydrogenEngine` 을 정의해주세요.
+         - HybridCar 에는 기존 Car 에 없던 새로운 동작이 추가됩니다.
+             - 엔진을 런타임에 바꿀 수 있는 `switchEngine(to:)` 입니다.
+     - [ ]  `HybridCar` 인스턴스를 생성하고, `switchEngine(to:)` 를 호출하여 서로 다른 타입의 엔진으로 교체하는 코드를 작성해주세요.
+     - [ ]  상속을 사용하여 기능을 추가하는 것과, 프로토콜 채택을 통해서 기능을 추가하는 것의 장단점, 차이를 고민하고 주석으로 서술해주세요.
+ */
+
+/* 1. Base Class `Car` 설계 */
+class Car{
+    private let brand: String
+    private let model: String
+    private let year: String
+    public var engine: Engine
+    private var isDrive: Bool = false
+    private var battery: Int = 50
+    public var fuel: Int = 95
+    
+    public func drive() {
+        isDrive = true
+        fuel -= 10
+        print("Car 주행 중...")
+    }
+    public func stop(){
+        isDrive = false
+        print("Car 멈춤")
+    }
+    
+    public func isDriving(){
+        if isDrive == true{
+            print("주행 중입니다.")
+        }else{
+            print("차가 멈춰있습니다.")
+        }
+    }
+    
+    public func charge(){
+        if battery == 100{
+            print("배터리 충전이 완료된 상태입니다.")
+        }else{
+            battery += 10
+            print("현재 배터리 잔량은 \(battery)입니다.")
+        }
+    }
+    
+    private func isFull(){
+        if fuel >= 100{
+            print("연료가 가득찼습니다.")
+        }
+    }
+    public func refuel(){
+        if fuel >= 100{
+            isFull()
+        }else if (fuel + 20) >= 100{
+            fuel = 100
+            isFull()
+        }else {
+            fuel += 20
+            print("현재 연료의 양은 \(fuel)입니다.")
+        }
+    }
+    
+    init(brand: String, model: String, year: String, engine: Engine) {
+        self.brand = brand
+        self.model = model
+        self.year = year
+        self.engine = engine
+    }
+}
+/* 2. Custom Engine */
+class Engine {
+    var engineName: String
+    
+    init(engineName: String) {
+        self.engineName = engineName
+    }
+}
+/* 3. Engine 상속받는 ElectricEngine, HydrogenEngine */
+class ElectricEngine: Engine {
+    init() {
+        super.init(engineName: "Electric Engine")
+    }
+}
+class HydrogenEngine: Engine {
+    init() {
+        super.init(engineName: "Hydrogen Engine")
+    }
+}
+/* 4. Car 상속받는 ElectricCar, HybridCar*/
+class ElectricCar: Car{
+}
+class HybridCar: Car{
+    /* 엔진을 런타임에 바꿀 수 있는 `switchEngine(to:)` */
+    func switchEngine(to newEngine: Engine){
+        engine = newEngine
+    }
+}
+/* 5. `HybridCar` 인스턴스를 생성 */
+var hybridcar = HybridCar(brand: "현대", model: "제네시스", year: "2025", engine: ElectricEngine())
+print(hybridcar.engine.engineName)
+/* 6. `switchEngine(to:)` 를 호출 */
+hybridcar.switchEngine(to: HydrogenEngine())
+print(hybridcar.engine.engineName)
+//hybridcar.drive()
+//hybridcar.stop()
+//hybridcar.isDriving()
+//hybridcar.drive()
+//hybridcar.isDriving()
+//hybridcar.charge()
+//hybridcar.refuel()
+//hybridcar.drive()
+//print(hybridcar.fuel)
+
+/* 7. 상속을 이용한 기능 추가, 프로토콜을 추가하여 기능 추가의 장,단점
+ 1. 상속
+ - 장점: 부모 클래스의 프로퍼티, 메소드를 바로 사용가능함.(생산성, 재사용성이 높음)
+ - 단점: 다중 상속이 불가능하다. 결합도가 높아서 유연하지 못함
+ 
+ 2. 프로토콜
+ - 장점: 다중 채택이 가능하다.(효율적, 유연함)
+ - 단점: 상속과 달리 공통로직도 매번 구현해야함.(혹은, Extension)
+ */
+
+
+
+/* 도전 문제 2.
+ - [ ]  SortableBox 라는 이름의 제네릭 구조체를 정의해주세요.
+     - 타입 파라미터는 1개이며, T 라는 이름으로 지정합니다.
+ - [ ]  SortableBox 에 인스턴스 프로퍼티 `var items: [T]` 를 추가해주세요.
+ - [ ]  타입 T 가 Comparable을 준수할 때에만 sortItems() 메서드를 사용할 수 있도록 구현하세요.
+     - sortItems() 메서드는 items 배열을 오름차순으로 정렬합니다.
+     - 정렬 결과는 items 프로퍼티에 반영되어야 합니다.
+ - [ ]  T 가 Comparable 을 따르지 않는 타입일 경우, sortItems() 호출 시 컴파일 오류가 발생해야합니다.
+ */
+
+/* 1. 제네릭 구조체 정의, 2. 프로퍼티 추가 */
+
+struct SortableBox<T>{
+    var items: [T]
+    /* 3.1 sortItems() 메서드 구현 */
+    mutating func sortItems() where T: Comparable{
+        self.items.sort()
+    }
+}
+
+/* 3.2 sortItems() 메서드 구현(Extension 사용) */
+//struct SortableBox<T>{
+//    var items: [T]
+//}
+//
+//extension SortableBox where T: Comparable{
+//    mutating func sortItems(){
+//        items.sort()
+//    }
+//}
+
+/* 테스트용(Comparable 준수) */
+var intbox = SortableBox(items: [4,2,3,1])
+intbox.sortItems()
+print(intbox.items)
+/* 테스트용(Comparable 미준수) */
+var boolbox = SortableBox(items: [true, false, true, false])
+/* Comparable 타입이 아닐 경우 sortItems() 호출 시 오류 발생*/
+//boolbox.sortItems()
+
+
+
+///* 도전 문제 3.
+// 필수문제 4 구현에서 연속된 문제입니다.
+//
+// - [ ]  Introducible 프로토콜을 채택하는 타입들에게 **기본 introduce() 동작**을 제공하세요.
+//     - 각 타입들이 introduce() 를 구현하지 않고도  introduce() 를 호출할 수 있어야합니다.
+// - [ ]  Robot, Cat, Dog 타입을 정의하고 Introducible 프로토콜을 채택해주세요.
+//     - 이 때, Robot 타입은  **기본 introduce() 동작** 이 아닌 커스텀 동작을 하도록 구현해주세요.
+// */
+//
+///* 1. Introducible 프로토콜 정의 */
+//protocol Introducible{
+//    var name: String {get set}
+//    func introduce()->String
+//}
+///* 2. protocol extension 정의 */
+//extension Introducible{
+//    func introduce() -> String {
+//        return "안녕하세요. 저는 \(name)입니다."
+//    }
+//}
+///* 3. Robot 정의 */
+//class Robot: Introducible{
+//    var name: String
+//    func introduce() -> String {
+//        return "I am a robot. My name is \(name)."
+//    }
+//    init(name: String){
+//        self.name = name
+//    }
+//}
+///* 4. Cat 정의 */
+//class Cat: Introducible{
+//    var name: String
+//    init(name: String) {
+//        self.name = name
+//    }
+//}
+///* 5. Dog 정의 */
+//class Dog: Introducible{
+//    var name: String
+//    init(name: String) {
+//        self.name = name
+//    }
+//}
+//
+///* 테스트용 */
+//var robot = Robot(name: "피규어")
+//var cat = Cat(name: "고양이")
+//var dog = Dog(name: "강아지")
+//print(robot.introduce())
+//print(cat.introduce())
+//print(dog.introduce())
+
+
+
+/* 도전 문제 4.
+ - [ ]  클래스 A, B 사이에 순환참조가 발생하도록 구현해주세요.
+     - 각 클래스에 `deinit` 을 정의하여, 메모리 해제 여부를 확인할 수 있도록 해주세요.
+ - [ ]  또한 클래스 B 에는 `closure: (() -> Void)?` 프로퍼티를 만들고, 클로저 내부에서 `A`의 인스턴스를 참조하게 하여 클로저 기반의 순환 참조도 발생시켜보세요.
+ - [ ]  순환 참조를 해결할 수 있도록 weak, unowned 키워드를 클로저 캡처 리스트를 적절히 사용하여 순환 참조를 해결해주세요.
+ */
+
+class A{
+    let name: String
+    init(name: String){
+        self.name = name
+    }
+    var B: B?
+    deinit{ print("\(name) is deinitialized")}
+}
+
+class B{
+    let age: Int
+    init(age: Int) {
+        self.age = age
+    }
+    weak var A: A?
+    deinit{ print("\(age) is deinitialized")}
+    
+    var closure: (()->Void)?
+}
+
+var a: A? = A(name: "A") // A RC: 1, B RC: 0
+var b: B? = B(age: 26) // A RC: 1, B RC: 1
+
+a?.B = b // A RC: 1, B RC: 2
+b?.A = a // A RC: 1, B RC: 2
+b?.closure = { [weak a] in
+        print("\(a?.name ?? "없음")")
+} // A RC: 1, B RC: 2
+
+a = nil // A RC: 0, B RC: 1 -> A.deinit 출력
+b = nil // A RC: 0, B RC: 0 -> B.deinit 출력

From 8a9aa728971c86cf7a4e9a22c78c275b49dda098 Mon Sep 17 00:00:00 2001
From: ybin4548 <ybin4548@gmail.com>
Date: Thu, 8 Jan 2026 21:10:04 +0900
Subject: [PATCH 2/8] clean up

---
 chap2/chap2.xcodeproj/project.pbxproj         | 294 ------------------
 .../contents.xcworkspacedata                  |   7 -
 .../UserInterfaceState.xcuserstate            | Bin 18550 -> 0 bytes
 .../xcschemes/xcschememanagement.plist        |  14 -
 4 files changed, 315 deletions(-)
 delete mode 100644 chap2/chap2.xcodeproj/project.pbxproj
 delete mode 100644 chap2/chap2.xcodeproj/project.xcworkspace/contents.xcworkspacedata
 delete mode 100644 chap2/chap2.xcodeproj/project.xcworkspace/xcuserdata/son-yeongbin.xcuserdatad/UserInterfaceState.xcuserstate
 delete mode 100644 chap2/chap2.xcodeproj/xcuserdata/son-yeongbin.xcuserdatad/xcschemes/xcschememanagement.plist

diff --git a/chap2/chap2.xcodeproj/project.pbxproj b/chap2/chap2.xcodeproj/project.pbxproj
deleted file mode 100644
index 37a9612..0000000
--- a/chap2/chap2.xcodeproj/project.pbxproj
+++ /dev/null
@@ -1,294 +0,0 @@
-// !$*UTF8*$!
-{
-	archiveVersion = 1;
-	classes = {
-	};
-	objectVersion = 77;
-	objects = {
-
-/* Begin PBXCopyFilesBuildPhase section */
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-			dstPath = /usr/share/man/man1/;
-			dstSubfolderSpec = 0;
-			files = (
-			);
-			runOnlyForDeploymentPostprocessing = 1;
-		};
-/* End PBXCopyFilesBuildPhase section */
-
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-/* End PBXFileReference section */
-
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-		};
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-			children = (
-				8AFFB8AD2F0D06A500B08B3D /* chap2 */,
-				8AFFB8AC2F0D06A500B08B3D /* Products */,
-			);
-			sourceTree = "<group>";
-		};
-		8AFFB8AC2F0D06A500B08B3D /* Products */ = {
-			isa = PBXGroup;
-			children = (
-				8AFFB8AB2F0D06A500B08B3D /* chap2 */,
-			);
-			name = Products;
-			sourceTree = "<group>";
-		};
-/* End PBXGroup section */
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-			buildPhases = (
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-				8AFFB8A82F0D06A500B08B3D /* Frameworks */,
-				8AFFB8A92F0D06A500B08B3D /* CopyFiles */,
-			);
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-			);
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-			);
-			fileSystemSynchronizedGroups = (
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-/* End PBXNativeTarget section */
-
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-				LastSwiftUpdateCheck = 2620;
-				LastUpgradeCheck = 2620;
-				TargetAttributes = {
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-			name = Debug;
-		};
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diff --git a/chap2/chap2.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/chap2/chap2.xcodeproj/project.xcworkspace/contents.xcworkspacedata
deleted file mode 100644
index 919434a..0000000
--- a/chap2/chap2.xcodeproj/project.xcworkspace/contents.xcworkspacedata
+++ /dev/null
@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Workspace
-   version = "1.0">
-   <FileRef
-      location = "self:">
-   </FileRef>
-</Workspace>
diff --git a/chap2/chap2.xcodeproj/project.xcworkspace/xcuserdata/son-yeongbin.xcuserdatad/UserInterfaceState.xcuserstate b/chap2/chap2.xcodeproj/project.xcworkspace/xcuserdata/son-yeongbin.xcuserdatad/UserInterfaceState.xcuserstate
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diff --git a/chap2/chap2.xcodeproj/xcuserdata/son-yeongbin.xcuserdatad/xcschemes/xcschememanagement.plist b/chap2/chap2.xcodeproj/xcuserdata/son-yeongbin.xcuserdatad/xcschemes/xcschememanagement.plist
deleted file mode 100644
index bd604b7..0000000
--- a/chap2/chap2.xcodeproj/xcuserdata/son-yeongbin.xcuserdatad/xcschemes/xcschememanagement.plist
+++ /dev/null
@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>SchemeUserState</key>
-	<dict>
-		<key>chap2.xcscheme_^#shared#^_</key>
-		<dict>
-			<key>orderHint</key>
-			<integer>0</integer>
-		</dict>
-	</dict>
-</dict>
-</plist>

From 1989a565f888e00de0b5438cb13fdb9bddf0b46b Mon Sep 17 00:00:00 2001
From: ybin4548 <ybin4548@gmail.com>
Date: Fri, 9 Jan 2026 12:38:57 +0900
Subject: [PATCH 3/8] =?UTF-8?q?=ED=95=84=EC=88=98=20=EB=AC=B8=EC=A0=9C=204?=
 =?UTF-8?q?.=20name=20=EB=B3=80=EA=B2=BD=20=EC=A1=B0=EA=B1=B4=20=EC=B6=94?=
 =?UTF-8?q?=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 chap2/chap2/main.swift | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/chap2/chap2/main.swift b/chap2/chap2/main.swift
index 1d73ada..64decbe 100644
--- a/chap2/chap2/main.swift
+++ b/chap2/chap2/main.swift
@@ -213,9 +213,11 @@ protocol Introducible{
 class Robot: Introducible{
     var name: String{
         didSet{
-            print("name 변경 알림")
-            print("변경 이전 값: \(oldValue)")
-            print("변경 이후 값: \(name)")
+            if oldValue != name{
+                print("name 변경 알림")
+                print("변경 이전 값: \(oldValue)")
+                print("변경 이후 값: \(name)")
+            }
         }
     }
     var batterySts: Int = 50
@@ -272,6 +274,7 @@ arr.append(robot)
 arr.append(cat)
 arr.append(dog)
 /* robot name 변경 */
+robot.name = "피규어"
 robot.name = "옵티머스"
 /* 배열 순회하며 고유 메서드 출력 */
 for idx in arr{
@@ -287,6 +290,7 @@ for idx in arr{
 
 
 
+
 /* 필수 문제 5.
  우리는 간단한 **택배 도착 예측 시스템**을 만들고 있다고 가정합니다.
 

From a5100d75f4c9c10457cee90cf875b090ef50e018 Mon Sep 17 00:00:00 2001
From: ybin4548 <ybin4548@gmail.com>
Date: Fri, 9 Jan 2026 17:19:22 +0900
Subject: [PATCH 4/8] =?UTF-8?q?=EB=8F=84=EC=A0=84=EB=AC=B8=EC=A0=9C1.=20re?=
 =?UTF-8?q?fuel()=20=EC=88=98=EC=A0=95,=20=EB=8F=84=EC=A0=84=EB=AC=B8?=
 =?UTF-8?q?=EC=A0=9C3.=20=EB=84=A4=EC=9D=B4=EB=B0=8D=20=EC=BB=A8=EB=B2=A4?=
 =?UTF-8?q?=EC=85=98?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 chap2/chap2/main.swift | 49 +++++++++++++++++++++++-------------------
 1 file changed, 27 insertions(+), 22 deletions(-)

diff --git a/chap2/chap2/main.swift b/chap2/chap2/main.swift
index 64decbe..581d1be 100644
--- a/chap2/chap2/main.swift
+++ b/chap2/chap2/main.swift
@@ -391,22 +391,22 @@ class Car{
     private let brand: String
     private let model: String
     private let year: String
-    public var engine: Engine
+    var engine: Engine
     private var isDrive: Bool = false
     private var battery: Int = 50
-    public var fuel: Int = 95
+    var fuel: Int = 95
     
-    public func drive() {
+    func drive() {
         isDrive = true
         fuel -= 10
         print("Car 주행 중...")
     }
-    public func stop(){
+    func stop(){
         isDrive = false
         print("Car 멈춤")
     }
     
-    public func isDriving(){
+    func isDriving(){
         if isDrive == true{
             print("주행 중입니다.")
         }else{
@@ -414,7 +414,7 @@ class Car{
         }
     }
     
-    public func charge(){
+    func charge(){
         if battery == 100{
             print("배터리 충전이 완료된 상태입니다.")
         }else{
@@ -423,20 +423,22 @@ class Car{
         }
     }
     
-    private func isFull(){
-        if fuel >= 100{
-            print("연료가 가득찼습니다.")
-        }
+    private func isFull() -> Bool{
+        return fuel >= 100
     }
-    public func refuel(){
-        if fuel >= 100{
-            isFull()
-        }else if (fuel + 20) >= 100{
+    func refuel(){
+        if isFull(){
+            print("이미 연료가 가득 찼습니다.")
+            return
+        }
+        fuel += 20
+        if fuel > 100 {
             fuel = 100
-            isFull()
-        }else {
-            fuel += 20
-            print("현재 연료의 양은 \(fuel)입니다.")
+        }
+        if isFull(){
+            print("연료가 가득찼습니다.")
+        }else{
+            print("연료가 충전되었습니다. 현재 연료량은 \(fuel)입니다.")
         }
     }
     
@@ -488,9 +490,12 @@ print(hybridcar.engine.engineName)
 //hybridcar.isDriving()
 //hybridcar.charge()
 //hybridcar.refuel()
+//hybridcar.refuel()
+//hybridcar.refuel()
 //hybridcar.drive()
 //print(hybridcar.fuel)
 
+
 /* 7. 상속을 이용한 기능 추가, 프로토콜을 추가하여 기능 추가의 장,단점
  1. 상속
  - 장점: 부모 클래스의 프로퍼티, 메소드를 바로 사용가능함.(생산성, 재사용성이 높음)
@@ -612,7 +617,7 @@ class A{
     init(name: String){
         self.name = name
     }
-    var B: B?
+    var b: B?
     deinit{ print("\(name) is deinitialized")}
 }
 
@@ -621,7 +626,7 @@ class B{
     init(age: Int) {
         self.age = age
     }
-    weak var A: A?
+    weak var a: A?
     deinit{ print("\(age) is deinitialized")}
     
     var closure: (()->Void)?
@@ -630,8 +635,8 @@ class B{
 var a: A? = A(name: "A") // A RC: 1, B RC: 0
 var b: B? = B(age: 26) // A RC: 1, B RC: 1
 
-a?.B = b // A RC: 1, B RC: 2
-b?.A = a // A RC: 1, B RC: 2
+a?.b = b // A RC: 1, B RC: 2
+b?.a = a // A RC: 1, B RC: 2
 b?.closure = { [weak a] in
         print("\(a?.name ?? "없음")")
 } // A RC: 1, B RC: 2

From 2fa897754bf16f3ccce74e328aed6ee52e31d7d7 Mon Sep 17 00:00:00 2001
From: ybin4548 <ybin4548@gmail.com>
Date: Mon, 12 Jan 2026 11:02:42 +0900
Subject: [PATCH 5/8] Add README.md

---
 README.md | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 README.md

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c9a2f41
--- /dev/null
+++ b/README.md
@@ -0,0 +1,22 @@
+# 프로그래밍 기초 주차 과제
+
+> 과제 수행 방식 및 코드 구조에 대한 안내입니다.
+
+---
+
+## 과제 작성 가이드라인
+
+본 프로젝트는 가독성과 실행 확인의 편의성을 위해 다음과 같은 원칙으로 작성되었습니다.
+
+### 1. 코드 구조: `main` 파일 통합 관리
+- **이유**: 문제별로 파일을 분리할 경우 전체적인 실행 여부 체크와 요구사항 수렴 판단이 어려울 수 있다고 판단하였습니다.
+- **가독성 보완**: 줄의 길이가 길어져 가독성이 떨어질 수 있는 점을 고려하여, **문제별 요구사항에 대한 상세 주석**을 첨부하였습니다.
+
+### 2. 풀이 순서
+1. **필수 문제**
+2. **도전 문제**
+
+### 3. 요구사항 체크 리스트
+- 각 문제의 요구사항은 지문의 `[ ]` 항목을 기준으로 삼아 꼼꼼히 구현하였습니다.
+
+---

From 26193a7839fd3a300e2c3a4a081e73bdf7de80c9 Mon Sep 17 00:00:00 2001
From: ybin4548 <ybin4548@gmail.com>
Date: Mon, 12 Jan 2026 19:50:18 +0900
Subject: [PATCH 6/8] =?UTF-8?q?=ED=95=84=EC=88=98=20=EB=AC=B8=EC=A0=9C=202?=
 =?UTF-8?q?=20=EC=88=98=EC=A0=95=20=EC=99=84=EB=A3=8C?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 chap2/chap2/main.swift | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/chap2/chap2/main.swift b/chap2/chap2/main.swift
index 581d1be..6f19f28 100644
--- a/chap2/chap2/main.swift
+++ b/chap2/chap2/main.swift
@@ -36,7 +36,6 @@ func calculate(calClosure: (Int, Int) -> String){
     let result = calClosure(20,20)
     print(result)
 }
-
 calculate(calClosure : sum)
 //방법 2. 계산 인자와 클로저를 파라미터로 받음(함수 호출 시에 인자를 지정하여 사용 가능)
 func calculate(val1 : Int, val2 :Int ,calClosure: (Int,Int)->String){
@@ -87,22 +86,29 @@ calculate(val1: 20, val2: 30, calClosure: sum)
 /* 1. for-in -> map 변경*/
 let numbers = [1,2,3,4,5]
 var result = [String]()
-result = numbers.map{String($0)}
+//result = numbers.map{String($0)}
+result = numbers.map(String.init)//재제출. map{}사용 -> map(String.init) 사용 가능
 print(result)
 
 /* 2. 고차함수 체이닝 */
 let num:[Int] = [1,2,3,4,5,6,7,8,9,10]
-var res:[String] = num.filter{$0 % 2 == 0}.map{String($0)}
+//var res:[String] = num.filter{$0 % 2 == 0}.map{String($0)}
+var res = num
+    .filter{ $0.isMultiple(of: 2)}
+    .map(String.init) //재제출. isMultiple(of:)사용 ,map{} -> map(String.init) 사용
 print(res)
 
 /* 3. 고차함수 생성 (map, filter, reduce 사용X */
+//func myMap(_ arr:[Int], toStr: (Int) -> String) -> [String]{
+//    var myres: [String] = []
+//    for idx in arr{
+//        myres.append(toStr(idx))
+//    }
+//    return myres
+//}
 func myMap(_ arr:[Int], toStr: (Int) -> String) -> [String]{
-    var myres: [String] = []
-    for idx in arr{
-        myres.append(toStr(idx))
-    }
-    return myres
-}
+    arr.map(toStr)
+} //재제출. 고자함수 생성 시 클로저 간소화(return 생략 !)
 let arr2 = myMap([1,2,3,4,5]){ //result는 위에서 사용 중이라 arr2로 대체했습니다.
     String($0)
 }
@@ -495,7 +501,6 @@ print(hybridcar.engine.engineName)
 //hybridcar.drive()
 //print(hybridcar.fuel)
 
-
 /* 7. 상속을 이용한 기능 추가, 프로토콜을 추가하여 기능 추가의 장,단점
  1. 상속
  - 장점: 부모 클래스의 프로퍼티, 메소드를 바로 사용가능함.(생산성, 재사용성이 높음)

From f9fa9a8d3acec3ff398ade2e49c210bfcac73bd4 Mon Sep 17 00:00:00 2001
From: ybin4548 <ybin4548@gmail.com>
Date: Mon, 12 Jan 2026 20:10:09 +0900
Subject: [PATCH 7/8] =?UTF-8?q?=ED=95=84=EC=88=98=20=EB=AC=B8=EC=A0=9C=203?=
 =?UTF-8?q?.=20=EC=88=98=EC=A0=95(=EA=B3=A0=EC=B0=A8=ED=95=A8=EC=88=98?=
 =?UTF-8?q?=EB=A1=9C=20=EB=B3=80=EA=B2=BD)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 chap2/chap2/main.swift | 92 +++++++++++++++++++++++++++++-------------
 1 file changed, 64 insertions(+), 28 deletions(-)

diff --git a/chap2/chap2/main.swift b/chap2/chap2/main.swift
index 6f19f28..df617c6 100644
--- a/chap2/chap2/main.swift
+++ b/chap2/chap2/main.swift
@@ -132,54 +132,90 @@ print(arr2)
  */
 
 /* 1. `a` 함수 작성 */
-func a(arr: [Int])->[Int]{
-    var iArr: [Int] = []
-    for idx in 0..<arr.count{
-        if idx % 2 != 0{
-            iArr.append(arr[idx])
+//func a(arr: [Int])->[Int]{
+//    var iArr: [Int] = []
+//    for idx in 0..<arr.count{
+//        if idx % 2 != 0{
+//            iArr.append(arr[idx])
+//        }
+//    }
+//    return iArr
+//}
+func a(arr: [Int]) -> [Int]{ //재제출. 함수 a 고차함수를 이용하도록 변경
+    arr.enumerated()
+        .filter{(idx,_) in
+            !idx.isMultiple(of: 2)
+        }
+        .map{ (_,value) in
+            value
         }
-    }
-    return iArr
 }
 let iArray = [1,2,3,4,5]
 print(a(arr: iArray))
 
 /* 2. `b` 함수 작성 */
-func b(arr: [String])->[String]{
-    var sArr: [String] = []
-    for idx in 0..<arr.count{
-        if idx % 2 != 0{
-            sArr.append(arr[idx])
+//func b(arr: [String])->[String]{
+//    var sArr: [String] = []
+//    for idx in 0..<arr.count{
+//        if idx % 2 != 0{
+//            sArr.append(arr[idx])
+//        }
+//    }
+//    return sArr
+//}
+func b(arr: [String]) -> [String]{ //재제출. 함수 b 고차함수를 이용하도록 변경
+    arr.enumerated()
+        .filter{(idx,_) in
+            !idx.isMultiple(of: 2)
+        }
+        .map{ (_,value) in
+            value
         }
-    }
-    return sArr
 }
 let sArray: [String] = ["가","나","다","라","마"]
 print(b(arr: sArray))
 
 /* 3. `c` 함수 작성 */
-func c<T>(arr: [T])->[T]{
-    var cArr: [T] = []
-    for idx in 0..<arr.count{
-        if idx % 2 != 0{
-            cArr.append(arr[idx])
+//func c<T>(arr: [T])->[T]{
+//    var cArr: [T] = []
+//    for idx in 0..<arr.count{
+//        if idx % 2 != 0{
+//            cArr.append(arr[idx])
+//        }
+//    }
+//    return cArr
+//}
+func c<T>(arr: [T]) -> [T]{ //재제출. 함수 c 고차함수를 이용하도록 변경
+    arr.enumerated()
+        .filter{(idx,_) in
+            !idx.isMultiple(of: 2)
+        }
+        .map{ (_,value) in
+            value
         }
-    }
-    return cArr
 }
 print(c(arr: iArray))
 print(c(arr: sArray))
 
 
 /* 4. `d` 함수 작성 */
-func d<T: Numeric>(arr: [T])->[T]{
-    var dArr: [T] = []
-    for idx in 0..<arr.count{
-        if idx % 2 != 0{
-            dArr.append(arr[idx])
+//func d<T: Numeric>(arr: [T])->[T]{
+//    var dArr: [T] = []
+//    for idx in 0..<arr.count{
+//        if idx % 2 != 0{
+//            dArr.append(arr[idx])
+//        }
+//    }
+//    return dArr
+//}
+func d<T: Numeric>(arr: [T]) -> [T]{ //재제출. 함수 d 고차함수를 이용하도록 변경
+    arr.enumerated()
+        .filter{(idx,_) in
+            !idx.isMultiple(of: 2)
+        }
+        .map{ (_,value) in
+            value
         }
-    }
-    return dArr
 }
 print(d(arr: iArray))
 print(d(arr: [1.0,2.0,3.0,4.0,5.0]))

From 0044fe9c1dbfd59307198c28aa544a88387a427b Mon Sep 17 00:00:00 2001
From: ybin4548 <ybin4548@gmail.com>
Date: Mon, 12 Jan 2026 20:12:03 +0900
Subject: [PATCH 8/8] =?UTF-8?q?=ED=95=84=EC=88=98=20=EB=AC=B8=EC=A0=9C=204?=
 =?UTF-8?q?.=20=EC=88=98=EC=A0=95(=EB=B0=B0=EC=97=B4=20=EC=88=9C=ED=9A=8C?=
 =?UTF-8?q?=20for=EB=AC=B8=EC=97=90=EC=84=9C=20forEach=20=EA=B3=A0?=
 =?UTF-8?q?=EC=B0=A8=ED=95=A8=EC=88=98=EB=A1=9C=20=EB=B3=80=EA=B2=BD)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 chap2/chap2/main.swift | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/chap2/chap2/main.swift b/chap2/chap2/main.swift
index df617c6..113392f 100644
--- a/chap2/chap2/main.swift
+++ b/chap2/chap2/main.swift
@@ -319,20 +319,33 @@ arr.append(dog)
 robot.name = "피규어"
 robot.name = "옵티머스"
 /* 배열 순회하며 고유 메서드 출력 */
-for idx in arr{
-    print(idx.introduce())
-    if let r = idx as? Robot{
+//for idx in arr{
+//    print(idx.introduce())
+//    if let r = idx as? Robot{
+//        r.batteryCharge()
+//    } else if let c = idx as? Cat{
+//        c.meow()
+//    } else if let d = idx as? Dog{
+//        d.bark()
+//    }
+//}
+arr.forEach{ //재제출. 기존: arr배열을 for문을 돌며 고유 메서드 출력 -> forEach 고차 함수를 사용하여 고유 메서드 출력
+    if let r = $0 as? Robot{
         r.batteryCharge()
-    } else if let c = idx as? Cat{
+        return
+    }
+    if let c = $0 as? Cat{
         c.meow()
-    } else if let d = idx as? Dog{
+        return
+    }
+    if let d = $0 as? Dog{
         d.bark()
+        return
     }
 }
 
 
 
-
 /* 필수 문제 5.
  우리는 간단한 **택배 도착 예측 시스템**을 만들고 있다고 가정합니다.