Update.

swift_14_generics.playground/Contents.swift

@@ -87,8 +87,3 @@ swapTwoValues( &myString1, &myString2 )
 
 print("After call swapTwoFloats: myString1 is now \(myString1), and myString2 is now \(myString2)")
 
-
-
-
-
-

swift_15_optionals.playground/Contents.swift

@@ -83,7 +83,7 @@ print("The player's health is \(player1.health) points.")
 // the ? allows you to use that property but only in the case where it
 // is not nil.
 
-print("The player's current weapon is \(player1.weapon?.name).")
+print("The player's current weapon is \(player1.weapon?.name as String?).")
 
 //------------------------------------------------------------------------------
 

swift_6_looping.playground/Contents.swift

@@ -44,12 +44,12 @@ for (name, score) in playerScores {
 
 //------------------------------------------------------------------------------
 
-// String provides a characters property that exposes a character collection
-// view which can be used to feed data to a For-In loop.
+// If a String is passed to a For-In loop, it will be treated as a character
+// collection which can be iterated through character by character.
 
 var myString = "LOL"
 
-for character in myString.characters {
+for character in myString {
     print(character)
 }
 

swift_8_functions_advanced.playground/Contents.swift

@@ -116,4 +116,3 @@ func processNumbers(_ number1: Int, _ number2: Int) -> Int {
 let result = processNumbers(1, 2)
 
 print(result)
-

swift_9_enumerations.playground/Contents.swift

@@ -86,14 +86,14 @@ print(team1.rawValue)
 
 var team2 = Team(rawValue: "Bravo")
 
-print("\(team2)")
+print("\(team2 as Team?)")
 
 
 // If the raw value that was passed in can not be turned into an enumeration
 // the initializer will return nil.
 var team3 = Team(rawValue: "X-Ray")
 
-print("\(team3)")
+print("\(team3 as Team?)")
 
 
 //------------------------------------------------------------------------------
@@ -190,6 +190,3 @@ var armor = ArmorTypes()
 
 print("Default armor type is: \(armor)")
 
-
-
-