optional_04.swift

Person {
  var firstname: String, var middlename: String?, var lastname: String
  
  func fullName() -> () {
     if (middlename != nil) {
        print("Your fullname is \(firstname) \(middlename!) \(lastname)")  
     } else {
        print("Your fullname is \(firstname) \(lastname)")
     }
     
  }
}

let anotherPerson = Person(firstname: "Abel", middlename: nil, lastname: "Adeyemi")

anotherPerson.fullName() //This will not throw an error