Could you explain the concept of recomposition in Jetpack Compose and why it is needed?

Recomposition in Jetpack Compose is the process of re-invoking composable functions to update the UI when the state changes. When the data that the UI depends on changes, Compose automatically "recomposes" only those parts of the interface that depend on this data to display the current state.

Why is this needed:

• It ensures efficient UI updates without manually managing changes.
• It allows writing declarative UI, where you describe how the interface should look in a certain state, and the system takes care of updates.

Example:

@Composable
fun Greeting(name: String) {
    Text(text = "Hello, $name!")
}

// When the parameter name changes, the Greeting function will be recomposed and update the text on the screen.

Thus, recomposition is a key mechanism in Jetpack Compose for reactive and efficient UI building.