remember and mutableStateOf in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a mutable state variable that remembers its value across recompositions.

Android Kotlin

val count = [1] { mutableStateOf(0) }

Drag options to blanks, or click blank then click option'

Aremember

BmutableStateOf

CmutableState

DstateOf

Attempts:

3 left

💡 Hint

Common Mistakes

Using mutableStateOf without remember causes state to reset on recomposition.

Confusing remember with mutableStateOf.

The remember function is used to keep the state across recompositions in Compose.

2fill in blank

medium

Complete the code to declare a mutable state integer variable initialized to 0.

Android Kotlin

var count by [1] { mutableStateOf(0) }

Drag options to blanks, or click blank then click option'

Aremember

BmutableStateOf

CstateOf

DmutableState

Attempts:

3 left

💡 Hint

Common Mistakes

Using mutableStateOf alone without remember.

Using stateOf which is immutable.

Using remember with mutableStateOf allows the variable to be mutable and remembered.

3fill in blank

hard

Fix the error in the code to properly remember a mutable state string initialized to "Hello".

Android Kotlin

val text = remember { [1]("Hello") }

Drag options to blanks, or click blank then click option'

AstateOf

Bremember

CmutableStateOf

DmutableState

Attempts:

3 left

💡 Hint

Common Mistakes

Using stateOf instead of mutableStateOf.

Using remember inside itself.

mutableStateOf creates a mutable state holder, which remember keeps across recompositions.

4fill in blank

hard

Fill both blanks to create a mutable state variable that remembers a Boolean value initialized to false.

Android Kotlin

var isChecked by [1] { [2](false) }

Drag options to blanks, or click blank then click option'

Aremember

BmutableStateOf

CstateOf

DmutableState

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping remember and mutableStateOf.

Using stateOf which is immutable.

remember keeps the state across recompositions, and mutableStateOf creates the mutable state.

5fill in blank

hard

Fill all three blanks to create a mutable state variable that remembers a String initialized to "Compose" and is mutable.

Android Kotlin

var title by [1] { [2]("[3]") }

Drag options to blanks, or click blank then click option'

Aremember

BmutableStateOf

CCompose

DstateOf

Attempts:

3 left

💡 Hint

Common Mistakes

Using stateOf instead of mutableStateOf.

Forgetting to use remember.

Putting the initial value outside the quotes.

The variable title is remembered with remember, made mutable with mutableStateOf, and initialized to "Compose".