Slotting in with Compose UI

The Slot API pattern in Jetpack Compose replaces simple primitive inputs with composable content lambdas, enabling flexible and reusable UI components. Using TopAppBar and TabRow as examples, the pattern delegates content rendering to callers, keeping components as simple pluggable layouts. This enforces single responsibility, improves testability, and avoids prop-drilling. The post also covers why modeling button styles as separate composable functions (Button, TextButton, OutlinedButton) is preferable to sealed class hierarchies, which break composable context requirements and testability.