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 us to conform to protocols and extend them with default implementations.