Simple Dependency Management in Kotlin
summary
Claim: Kotlin language features alone handle dependency wiring without Dagger or Koin by composing interfaces and encoding type classes. The demo refactors a fetchUser flow into small interface composition pieces, wraps results in a generic Kind/F emulation so network and DB return F<User>, and adds constructors just, raiseError, defer, async to control eagerness and errors. Arrow supplies the runtime type class interfaces and an annotation processor to generate bindings until KEEP‑87 lands. The example app and library code compile and run end to end.
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chapters (9)
- 0:00Introduction
- 1:43Starting the example
- 7:28Refactoring without Arrow
- 11:41Introducing Kind and Applicative
- 20:01Adding Defer and Async
- 27:51Putting it all together
- 30:03Type-based dependency injection
- 42:00Summary and takeaways
- 44:29Q&A
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