Migrated Playground and Test to Swift 4

Author: shabirjan

Comb Sort/Comb Sort.playground/Contents.swift

@@ -3,6 +3,10 @@
 // 7-16-2016
 
 import Cocoa
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+print("Hello, Swift 4!")
+#endif
 
 // Test Comb Sort with small array of ten values
 let array = [2, 32, 9, -1, 89, 101, 55, -10, -12, 67]

Comb Sort/Comb Sort.playground/Sources/Comb Sort.swift

@@ -21,7 +21,7 @@ public func combSort<T: Comparable>(_ input: [T]) -> [T] {
         var index = 0
         while !(index + gap >= copy.count) {
             if copy[index] > copy[index + gap] {
-                swap(&copy[index], &copy[index + gap])
+               copy.swapAt(index, index + gap)
             }
             index += 1
         }

Comb Sort/Comb Sort.swift

@@ -11,17 +11,17 @@ public func combSort<T: Comparable>(_ input: [T]) -> [T] {
     var copy: [T] = input
     var gap = copy.count
     let shrink = 1.3
-
+    
     while gap > 1 {
         gap = (Int)(Double(gap) / shrink)
         if gap < 1 {
             gap = 1
         }
-
+        
         var index = 0
         while !(index + gap >= copy.count) {
             if copy[index] > copy[index + gap] {
-                swap(&copy[index], &copy[index + gap])
+                copy.swapAt(index, index + gap)
             }
             index += 1
         }

Comb Sort/Tests/CombSortTests.swift

@@ -12,6 +12,11 @@ class CombSortTests: XCTestCase {
     var sequence: [Int]!
     let expectedSequence: [Int] = [-12, -10, -1, 2, 9, 32, 55, 67, 89, 101]
 
+    func testSwift4(){
+        #if swift(>=4.0)
+            print("Hello, Swift 4!")
+        #endif
+    }
     override func setUp() {
         super.setUp()
         sequence = [2, 32, 9, -1, 89, 101, 55, -10, -12, 67]

Comb Sort/Tests/Tests.xcodeproj/project.pbxproj

@@ -179,6 +179,7 @@
 				SDKROOT = macosx;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -220,6 +221,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = macosx;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -233,7 +235,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "Swift-Algorithm-Club.Tests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -246,7 +248,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "Swift-Algorithm-Club.Tests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};