Swift Functional Programming - Second Edition

Conforming to a protocol

The following code presents an example of protocol conformance with associated type usage:

enum MobileAppUserType: MobileAppUserProtocol {     case admin     case endUser     func greet(name: String) -> String {         switch self {         case .admin:             return "Welcome \(name) - You are Admin"         case .endUser:             return "Welcome \(name)!"         }     }     func login(username: String, password: String) -> Bool {         return true     }     func listSelectedModules() -> [String] {         return ["Accounting", "CRM"]     } } 

Then we can create a new mobile user as follows:

let mobileUser: MobileAppUserType = MobileAppUserType.admin mobileUser.logout(userName: "Su Tamina") mobileUser.listSelectedModules() 

POP minimizes the inheritance and subclassing necessities by enabling ...