optional_06.swift

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

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

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