Minimum Edit Distance updated to Swift 4

Minimum Edit Distance/MinimumEditDistance.playground/Contents.swift

@@ -1,21 +1,26 @@
-extension String {
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+print("Hello, Swift 4!")
+#endif
 
+extension String {
+
     public func minimumEditDistance(other: String) -> Int {
         let m = self.characters.count
         let n = other.characters.count
         var matrix = [[Int]](repeating: [Int](repeating: 0, count: n + 1), count: m + 1)
-
+        
         // initialize matrix
         for index in 1...m {
             // the distance of any first string to an empty second string
             matrix[index][0] = index
         }
-
+        
         for index in 1...n {
             // the distance of any second string to an empty first string
             matrix[0][index] = index
         }
-
+        
         // compute Levenshtein distance
         for (i, selfChar) in self.characters.enumerated() {
             for (j, otherChar) in other.characters.enumerated() {
@@ -25,7 +30,7 @@ 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)
                 }
             }
         }