Merge pull request kodecocodes#545 from shabirjan/AVLTree-Swift4

Avl tree swift4

Author: kelvinlauKL

AVL Tree/AVLTree.playground/Contents.swift

@@ -1,5 +1,10 @@
 //: Playground - noun: a place where people can play
 
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+print("Hello, Swift 4!")
+#endif
+
 let tree = AVLTree<Int, String>()
 
 tree.insert(key: 5, payload: "five")

AVL Tree/Tests/AVLTreeTests.swift

@@ -7,11 +7,15 @@
 //
 
 import XCTest
-
 class AVLTreeTests: XCTestCase {
-
   var tree: AVLTree<Int, String>?
 
+    func testSwift4() {
+        // last checked with Xcode 9.0b4
+        #if swift(>=4.0)
+            print("Hello, Swift 4!")
+        #endif
+    }
   override func setUp() {
     super.setUp()
 

AVL Tree/Tests/Tests.xcodeproj/project.pbxproj

@@ -180,6 +180,7 @@
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = macosx;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -219,6 +220,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = macosx;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -230,7 +232,7 @@
 				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 = Debug;
 		};
@@ -242,7 +244,7 @@
 				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;
 		};

AVL Tree/Tests/TreeNodeTests.swift

@@ -9,11 +9,16 @@
 import XCTest
 
 class TreeNodeTests: XCTestCase {
-
+   
     var root: TreeNode<String, String>?
     var left: TreeNode<String, String>?
     var right: TreeNode<String, String>?
-
+    func testSwift4() {
+        // last checked with Xcode 9.0b4
+        #if swift(>=4.0)
+            print("Hello, Swift 4!")
+        #endif
+    }
     override func setUp() {
         super.setUp()