Dependency Injection from Zero to Hero
summary
Koin is a lightweight runtime DI for Kotlin that uses a tiny DSL to declare singletons and factories and boots with startKoin with modules so Android apps get constructor injection, Activity/Fragment extensions and ViewModel support without no code generation. Version 2.0 rewrites internals to approach Dagger’s startup speed, benchmarks show reflection-based auto-wiring is 4–10× slower than the explicit DSL, runtime module load/unload and checkModules JUnit tests let teams migrate from Dagger incrementally and test the graph.
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chapters (13)
- 0:00Introduction and motivation
- 7:30Pure Kotlin dependency example
- 10:39What is Koin and its DSL
- 15:38Koin components and Android context
- 20:10Migrating from Dagger to Koin
- 23:01Android extensions and ViewModel
- 29:03Testing with Koin
- 31:10Koin 2.0 improvements
- 33:17Service locator vs dependency injection
- 35:03Functional dependency injection
- 38:56Dynamic modular architecture
- 41:43Tips and getting started
- 43:05Q&A and conclusion
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