2 ms·

Sorry, forgot about mentioning the very language the OP was about. That was stupid. You would use the "New" constructor function pattern in this case, using a

• kornish 9y ago
  > You would use the "New" constructor function pattern in this case, using a higher order function called at injection time to keep it reusable and hide everything. Spot on. I love the decorator pattern for dependency injection. type Server struct { logger *logrus.Logger // optional store databaste.Store // required } type ServerOption func(Server) Server func WithLogger(logger *logrus.Logger) ServerOption { return func(s Server) Server { s.logger = logger return s } } func NewServer(store database.Store, options ...ServerOption) *Server { s := Server{store: store} for _, option := range options { s = option(s) } return &s } func main() { myServer := NewServer(myStore, WithLogger(myLogger)) }