I am using kotlin for several years now and my pro...

# announcements

[Paul Woitaschek]

I am using kotlin for several years now and my programming style is evolving and becoming more functional. I write way more top level functions that I did one year ago.
What I ask myself is: What do I do when my functions need more dependencies?
Lets say I have a file with one public top level function and it calls private functions which themselfes call other functions too.
When I now need the class X and Y in fun d(x : X, y : Y) it's painful to change all that code just for passing them through from fun a(x : X, y : Y) -> fun b(x : X, y : Y) -> fun c(x : X, y : Y) -> fun d(x : X, y : Y).
Are there any common approaches / patterns to solve this?

[spand]

Dependency injection 😉

[dalexander]

I think you’re describing the problem that dependency injection is designed to solve.

[spand]

And the functional variant partially applied functions. It sucks that you lose the top level aspect but its the only way afaik.

[spand]

If you can somehow group up your dependencies then you can take them as the receiver. This keeps it a bit under control but not very good general solution.

[Egor Trutenko]

You might want to consider using Arrow: arrow-kt.io
And, specifically, Dependency Injection pattern: https://arrow-kt.io/docs/patterns/dependency_injection/