medium10 pts · first answer countsjetpack-composeside-effects

LaunchedEffect keyed on Unit

The parent changes userId from "a" to "b" while this Profile composable stays on screen. What happens?

@Composable
fun Profile(userId: String, vm: ProfileViewModel) {
  LaunchedEffect(Unit) {
    vm.load(userId)
  }
  // ... UI
}

A.load("b") runs, because the composable recomposedB.Nothing new loads, because an effect keyed on Unit runs only once; use LaunchedEffect(userId) so it restarts when the id changesC.The app crashes with an IllegalStateException, because an effect key cannot stay the same while the parameters of its composable changeD.load runs twice in parallel, once for each id

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LaunchedEffect keyed on Unit

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