Summary - Compose MP

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.

Exercise Write composeSummary

Define fun composeSummary(): String. It should return "Compose: composable + remember + state". In main, write println(composeSummary()).

Show example solution

fun composeSummary(): String = "Compose: composable + remember + state"
fun main() {
    println(composeSummary())
}

Test yourself

What are the core building blocks of Compose MP?
```
Compose MP rests on three pillars.
```
- Class and object
- @Composable + remember + MutableState
- XML and layout
- Activity and fragment
Show answer

@Composable + remember + MutableState — @Composable, remember and MutableState are the core of Compose MP.

Complete the composeSummary string

fun composeSummary(): String = "____"

Show answer

fun composeSummary(): String = "Compose: composable + remember + state"

Match the Compose MP concepts

@Composable

UI function
remember

Retention
mutableStateOf

Reactive state
Unit

Return type

Next lesson: Profiling

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