Jetpack Compose Academy · Lesson

derivedStateOf & snapshotFlow

Compute and observe derived state efficiently.

Computing Values from State

Sometimes a value depends on other state, like a button enabled only when a form is valid. Computing it well avoids wasteful recomposition.

A derivedStateOf creates state from a calculation. It only notifies readers when the computed result actually changes, not on every input tweak.

val isValid by remember {
    derivedStateOf { name.isNotBlank() && age > 0 }
}