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Kotlin Multiplatform Core Concepts Mastery Hub: The Industry

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Q1Domain Verified
In the context of Kotlin Multiplatform Mobile (KMM), which of the following best describes the primary role of the `commonMain` source set?
To manage platform-specific dependencies and build configurations for each native target.
To contain platform-specific implementations for iOS, Android, and desktop applications.
To define shared business logic, data models, and presentation logic that can be reused across all target platforms.
To serve as a testing environment for verifying the integration of platform-specific APIs with shared code.
Q2Domain Verified
When designing a KMM application, you encounter a scenario where you need to access a platform-specific API, such as the device's camera on Android or the Photo Library on iOS. Which KMM construct is the most idiomatic and recommended approach for handling this cross-platform abstraction?
Creating separate KMM modules for each platform and duplicating the camera access logic within each.
Directly importing platform-specific SDKs into the `commonMain` source set and using reflection to access methods.
Using conditional compilation (`expect`/`actual`) to define an interface in `commonMain` and provide platform-specific implementations in `androidMain` and `iosMain`.
Relying on a third-party multiplatform library that abstracts camera access, even if it introduces external dependencies.
Q3Domain Verified
Consider a KMM project where you've defined a `Repository` interface in `commonMain` and its `actual` implementations in `androidMain` and `iosMain`. If you need to inject an instance of this `Repository` into a ViewModel in `commonMain`, which dependency injection (DI) strategy is most commonly employed and recommended within the KMM ecosystem for this scenario?
Using a platform-agnostic DI framework like Koin or Kodein, configured within the `commonMain` module with platform-specific modules for registration.
Relying on Kotlin's built-in service locator pattern by registering implementations in a global registry accessible from `commonMain`.
Manual dependency injection, where you explicitly create and pass `Repository` instances throughout the application's component tree.
Leveraging platform-specific DI frameworks (e.g., Hilt for Android, Swinject for iOS) and bridging them through `expect`/`actual` interfaces.

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