Dependency injection (DI) adalah pola di mana objek menerima dependensi mereka dari luar daripada membuatnya sendiri — meningkatkan testability, maintainability, dan flexibility. Di Android, Hilt (dibangun di atas Dagger) adalah framework DI yang direkomendasikan.
Apa itu DI dan mengapa
WITHOUT DI: a class CREATES its own dependencies (tightly coupled, hard to test/change):
class UserRepo { val api = ApiService() } // creates its own dependency — rigid
WITH DI: dependencies are PROVIDED from outside (injected):
class UserRepo(val api: ApiService) // receives it → flexible, testable
→ Benefits: TESTABILITY (inject mocks/fakes in tests), DECOUPLING, easier to swap
implementations, centralized dependency management, less boilerplate (with a framework).
