Hi Long, it is a pleasure for me to see you commenting on my article, I've been following you and reading your articles, you are a great teacher.

Yes, it is like a singleton, to avoid having one service inited multiple times, (i.e a service that you are gonna need in every viewController)

And we dont what developer be concerned with creating services at all.

It is like this dependency container that is used in other frameworks in web.

I looked into the github repo; that is a good idea, I will try it.

Thank you