Swift
println("With In Block Two") }
let badresult = functions(funct: "five") if badresult == nil { println("Block Does Not Exist") } When we run the above program using playground, we get the following result: With In Block Two Block Does Not Exist
Failable Initializers for Classes A failable initializer when declared with enumerations and structures alerts an initialization failure at any circumstance within its implementation. However, failable initializer in classes will alert the failure only after the stored properties have been set to an initial value. class studrecord { let studname: String! init?(studname: String) { self.studname = studname if studname.isEmpty { return nil } } } if let stname = studrecord(studname: "Failable Initializers") { println("Module is \(stname.studname)") } When we run the above program using playground, we get the following result: Module is Failable Initializers
Overriding a Failable Initializer Like that of initialize the user also has the provision to override a superclass failable initializer inside the sub class. Super class failable initialize can also be overridden with in a sub class non-failable initializer. 150