marcinjackowski

class FriendsService: FriendsWorker {
    func fetch() -> [Friend] {
        return []
    }
}

class FriendsDatabase: FriendsWorker {
    func fetch() -> [Friend] {
        return []
    }

marcinjackowski

protocol FriendsWorker {
    func fetch() -> [Friend]
}

marcinjackowski

final class Profile {
    private let service = FriendsService()
    
    init() {
        fetch()
    }
    
    private func fetch() {
        service.fetch()
    }