September Morn Update

Task/Null-object/Swift/null-object-1.swift

@@ -1,2 +1 @@
-var opt : Int? = nil // use "nil" to represent no value
-opt = 5 // or simply assign a value to the optional type
+let maybeInt: Int? = nil

Task/Null-object/Swift/null-object-2.swift

@@ -1,5 +1,5 @@
-if let v = opt {
-    println("There is some value: \(v)")
+if maybeInt == nil {
+  print("variable is nil")
 } else {
-    println("There is no value")
+  print("variable has some value")
 }

Task/Null-object/Swift/null-object-3.swift

@@ -0,0 +1,5 @@
+if let certainlyInt = maybeInt {
+  print("variable has value \(certainlyInt)")
+} else {
+  print("variable is nil")
+}