viewmodel_static.swift

enum ViewModel {
    case normal(model: Model)
    case error(title: String, description: String, showRetryButton: Bool)
}

extension ViewModel {
    static func serverError(showRetryButton: Bool) -> ViewModel {
        return .error(title: "Oops", description: "Something went wrong", showRetryButton: showRetryButton)
    }
    
    static func noInternetConnection(showRetryButton: Bool) -> ViewModel {
        return .error(title: "Oops", description: "No Internet connection", showRetryButton: showRetryButton)
    }
}