10 new Swift 4 updates

Linear Search/LinearSearch.playground/Contents.swift

@@ -1,6 +1,6 @@
 //: Playground - noun: a place where people can play
 
-// last checked with Xcode 4.0b4
+// last checked with Xcode 9.0b4
 #if swift(>=4.0)
 print("Hello, Swift 4!")
 #endif

Minimum Edit Distance/MinimumEditDistance.playground/Contents.swift

@@ -1,3 +1,10 @@
+// Minimum Edit Distance
+
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+print("Hello, Swift 4!")
+#endif
+
 extension String {
 
     public func minimumEditDistance(other: String) -> Int {
@@ -25,7 +32,7 @@ extension String {
                 } else {
                     // minimum of the cost of insertion, deletion, or substitution 
                     // added to the already computed costs in the corresponding cells
-                    matrix[i + 1][j + 1] = min(matrix[i][j] + 1, matrix[i + 1][j] + 1, matrix[i][j + 1] + 1)
+                    matrix[i + 1][j + 1] = Swift.min(matrix[i][j] + 1, matrix[i + 1][j] + 1, matrix[i][j + 1] + 1)
                 }
             }
         }

Minimum Edit Distance/README.markdown

@@ -45,7 +45,7 @@ for (i, selfChar) in self.characters.enumerated() {
         } else {
             // minimum of the cost of insertion, deletion, or substitution 
             // added to the already computed costs in the corresponding cells
-            matrix[i + 1][j + 1] = min(matrix[i][j] + 1, matrix[i + 1][j] + 1, matrix[i][j + 1] + 1)
+            matrix[i + 1][j + 1] = Swift.min(matrix[i][j] + 1, matrix[i + 1][j] + 1, matrix[i][j + 1] + 1)
         } 
     }
 }

Monty Hall Problem/MontyHall.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
+
 import Foundation
 
 func random(_ n: Int) -> Int {
@@ -43,7 +48,7 @@ func playRound() {
 }
 
 // Run the simulation a large number of times.
-for i in 1...5000 {
+for _ in 1...5000 {
   playRound()
 }
 

Naive Bayes Classifier/NaiveBayes.playground/Contents.swift

@@ -1,5 +1,10 @@
 import Foundation
 
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+print("Hello, Swift 4!")
+#endif
+
 /*:
  ## Naive Bayes Classifier
 

Rabin-Karp/Rabin-Karp.playground/Contents.swift

@@ -1,5 +1,10 @@
 //: Taking our rabin-karp algorithm for a walk
 
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+print("Hello, Swift 4!")
+#endif
+
 import UIKit
 
 struct Constants {

Radix Tree/RadixTree.playground/Contents.swift

@@ -1,3 +1,10 @@
+// Radix Tree
+
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+print("Hello, Swift 4!")
+#endif
+
 var radix = RadixTree()
 var radixWiki = RadixTree()
 

Ring Buffer/RingBuffer.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
+
 public struct RingBuffer<T> {
   fileprivate var array: [T?]
   fileprivate var readIndex = 0

Run-Length Encoding/RLE.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
+
 import Foundation
 
 let originalString = "aaaaabbbcdeeeeeeef"

Selection Sampling/SelectionSampling.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
+
 import Foundation
 
 /* Returns a random integer in the range min...max, inclusive. */

Set Cover (Unweighted)/SetCover.playground/Contents.swift

@@ -1,3 +1,10 @@
+// SetCover
+
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+print("Hello, Swift 4!")
+#endif
+
 let universe1 = Set(1...7)
 let array1 = randomArrayOfSets(covering: universe1)
 let cover1 = universe1.cover(within: array1)