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Posted By: Udit Verma
@Composable
fun TimerScreen() {
LaunchedEffect(key1 = Unit, block = {
try {
startTimer(5000L) { // start a timer for 5 secs
println("Timer ended")
}
} catch(ex: Exception) {
println("timer cancelled")
}
})
}
suspend fun startTimer(time: Long, onTimerEnd: () -> Unit) {
delay(timeMillis = time)
onTimerEnd()
}
The dictionary defines the term side-effect as an undesirable effect. While this applies to compose side-effects as well, sometimes they are required to mutate the state of the app. Side effects are undesirable because they can potentially change the state of the app outside the scope of the composable (global state).
@Composable
fun TimerScreen1() {
Column(
modifier = Modifier
.fillMaxSize(),
horizontalAlignment = Alignment.CenterHorizontally
) {
var timerDuration by remember {
mutableStateOf(1000L) // default value = 1 sec
}
Button({
timerDuration -= 1000
}) {
Text("-1 second")
}
Text(timerDuration.toString())
Button({
timerDuration += 1000
}) {
Text("+1 second")
}
Timer(timerDuration = timerDuration)
}
}
@Composable
fun Timer(timerDuration: Long) {
LaunchedEffect(key1 = timerDuration, block = {
try {
startTimer(timerDuration) {
println("Timer ended")
}
} catch (ex: Exception) {
println("timer cancelled")
}
})
}
The dictionary defines the term side-effect as an undesirable effect. While this applies to compose side-effects as well, sometimes they are required to mutate the state of the app. Side effects are undesirable because they can potentially change the state of the app outside the scope of the composable (global state).

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