How does Jetpack Compose determine the need to update the UI and redraw components?

Jetpack Compose uses the concept of reactive programming. It tracks changes in state and automatically determines when to update the UI.

When a value associated with a component (for example, a state variable) changes, Compose marks that component as "dirty" and schedules its re-rendering. During the next rendering cycle, Compose recreates only those parts of the interface that depend on the changed data, which improves performance.

Example:

var count by remember { mutableStateOf(0) }
Button(onClick = { count++ }) {
    Text("Clicked $count times")
}

Here, when count changes, Compose automatically updates the text inside the button.