kotlin

MVVM with Kotlin separates UI logic from business logic through ViewModels that manage state with Flow or StateFlow, enabling reactive updates. Use sealed classes for type-safe state representation, data classes for model objects, and coroutines for asynchronous operations—this pattern ensures testability and maintains null-safety throughout your architecture.

Kotlin coroutines are lightweight threads that simplify asynchronous programming by suspending execution without blocking. In Android, they work with Flow for reactive streams and StateFlow for observable state, allowing you to handle network calls, database queries, and UI updates concisely while respecting lifecycle awareness.

Yes, Jetpack Compose is the modern declarative UI toolkit for Kotlin/Android development. It integrates seamlessly with coroutines and state management patterns, replacing traditional XML layouts with composable functions that automatically recompose when state changes.

Use Gradle with version catalogs to centralize dependency declarations across modules, enabling consistency and easier updates. Configure each module with appropriate plugins and dependencies, leverage sealed classes and data classes for type safety, and structure your project to support coroutine-based state handling across features.

Kotlin enforces null-safety at compile time through nullable (?) and non-nullable types. Always declare nullable types explicitly, use safe-call operators (?.), and leverage sealed classes with exhaustive when expressions to eliminate runtime null-pointer exceptions while maintaining type safety.

Wrap coroutine operations in try-catch blocks or use catch operators in Flow pipelines to handle exceptions gracefully. Use sealed classes to represent success and error states, propagate errors through StateFlow for UI consumption, and ensure proper exception handling in ViewModel coroutine scopes.