lelandrichardson

fun App($composer: Composer) {
 val result = getData()
 if (result == null) {
   $composer.start(123)
   Loading(...)
   $composer.end()
 } else {
   $composer.start(456)
   Header(result)
   Body(result)

lelandrichardson

@Composable fun App() {
 val result = getData()
 if (result == null) {
   Loading(...)
 } else {
   Header(result)
   Body(result)
 }
}

lelandrichardson

fun Counter($composer: Composer) {
 $composer.start(123)
 var count by remember($composer) { mutableStateOf(0) }
 Button(
   $composer,
   text="Count: $count",
   onPress={ count += 1 },
 )
 $composer.end()
}

lelandrichardson

fun Counter($composer: Composer) {
 $composer.start(123)
 var count by remember { mutableStateOf(0) }
 Button(
   text="Count: $count",
   onPress={ count += 1 }
 )
 $composer.end()
}

lelandrichardson

@Composable
fun Counter() {
 var count by remember { mutableStateOf(0) }
 Button(
   text="Count: $count",
   onPress={ count += 1 }
 )
}

lelandrichardson

fun Example(a: () -> Unit, b: @Composable () -> Unit) {
   a() // allowed
   b() // NOT allowed
}
 
@Composable 
fun Example(a: () -> Unit, b: @Composable () -> Unit) {
   a() // allowed
   b() // allowed
}

lelandrichardson

fun Example(a: () -> Unit, b: suspend () -> Unit) {
   a() // allowed
   b() // NOT allowed
}
 
suspend 
fun Example(a: () -> Unit, b: suspend () -> Unit) {
   a() // allowed
   b() // allowed
}

lelandrichardson

// function declaration
@Composable fun MyFun() { … }
 
// lambda declaration
val myLambda = @Composable { … }
 
// function type
fun MyFun(myParam: @Composable () -> Unit) { … }

lelandrichardson

// function declaration
suspend fun MyFun() { … }
 
// lambda declaration
val myLambda = suspend { … }
 
// function type
fun MyFun(myParam: suspend () -> Unit) { … }

lelandrichardson

@Composable
fun Messages(liveMsgs: LiveData<MessageData>) {
 val msgs by liveMsgs.observeAsState()
 for (msg in msgs) {
   Message(msg)
 }
}