Summary - Compose MP
- Kotlin course
- Expert
- Lesson 36/47
- 5 min
Combine @Composable, remember and MutableState to write a cross-platform UI.
Summary - Compose MP
In this group you learned Compose MP, @Composable, remember and MutableState. Now you will write a model that combines them: a combined info function.
Your composeSummary function brings together three pillars: the @Composable declaration, retention with remember, and reactive state with mutableStateOf. In main you will call this function and print the result. This is the typical Compose MP combination.
Combining: composable + remember + state
Now we combine all parts. @Composable draws UI; remember stores state; mutableStateOf adds reactivity.
Example model: fun composeSummary(): String = "Compose: composable + remember + state". This function summarises the combination; in main you write println(composeSummary()). In a real composable these three work together: the composable is called, remember holds state, and a state change triggers redraw.
Practice Write composeSummary
Define fun composeSummary(): String. It should return "Compose: composable + remember + state". In main, write println(composeSummary()).
Starter code
// add the composeSummary function
fun main() {
// print the Compose MP summary
}Sample solution
fun composeSummary(): String = "Compose: composable + remember + state"
fun main() {
println(composeSummary())
}Expected output
Compose: composable + remember + state
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 What are the core building blocks of Compose MP?
Compose MP rests on three pillars.- Class and object
- @Composable + remember + MutableState Correct answer
- XML and layout
- Activity and fragment
Explanation: @Composable, remember and MutableState are the core of Compose MP.
2 Complete the composeSummary string
fun composeSummary(): String = "____"fun composeSummary(): String = "Compose: composable + remember + state"Explanation: This string summarises the Compose MP combination.
3 Match the Compose MP concepts
| Term | Meaning |
|---|---|
@Composable |
UI function |
remember |
Retention |
mutableStateOf |
Reactive state |
Unit |
Return type |