Compose State Quiz – Answertopia

This quiz focuses on the fundamental concepts of state management in Jetpack Compose, including state, recomposition, unidirectional data flow, and state hoisting. It also covers best practices for saving and restoring state during configuration changes, such as using remember and rememberSaveable. Each question is designed to test your understanding of these concepts and their application in creating efficient, responsive user interfaces using Compose.

What happens if you forget to use remember with a mutable state in Compose?

The state will be re-initialized on every recomposition

The state will be preserved through configuration changes

The state will be retained across recompositions

The state will trigger recompositions

None

How can state be made accessible to multiple child composables?

By using multiple state variables in each child

By declaring state directly in each child

By ignoring recomposition in child components

By hoisting state to the closest common ancestor

None

What happens when a configuration change occurs in Compose?

The app continues without any change

The activity is destroyed and recreated with new state values

State values are preserved automatically

Only the affected composable functions are recomposed

None

Which function is used to make a composable function respond to state changes?

saveableState

mutableStateOf

setState

statefulCompose

None

What is recomposition in the context of Compose?

The process of calling a composable function again when a state changes

The process of saving state through configuration changes

The initialization of variables in a new project

The creation of new composable functions

None

What does the rememberSaveable function do?

Re-initializes state after every recomposition

Prevents state changes during recomposition

Ensures that state is only remembered during the initial run

Retains state across recompositions and configuration changes

None

What is state in Compose?

A value that can change over time and is remembered during recompositions

A value that only changes during app initialization

A standard variable that changes during execution

A value that remains constant throughout the app lifecycle

None

When should you consider using rememberSaveable instead of remember?

When recomposition should be prevented

When initializing variables with default values

When state needs to be retained through device rotations

When state should not persist across configuration changes

None

What is the advantage of using a stateless composable?

It is simpler and easier to test

It is tightly coupled to its parent

It directly manipulates state without needing event handlers

It cannot be reused in other parts of the app

None

10.

Why is the remember keyword not sufficient for retaining state during screen rotation?

It automatically saves state through configuration changes

It only retains state through recompositions, not configuration changes

It does not allow state to change

It is used for saving state to a database

None

11.

Which of the following is a key benefit of hoisting state?

Making a child composable directly manipulate state

Allowing state to be shared among multiple child composables

Ensuring state is only remembered during initial rendering

Retaining state through recompositions

None

12.

Why is intelligent recomposition important in Compose?

It recomposes only functions directly affected by state changes

It recomposes the entire UI on every state change

It allows state to be modified directly by child functions

It prevents any recompositions from occurring

None

13.

What does mutableStateOf do?

Creates a state variable that triggers recomposition when updated

Creates a state variable that cannot be changed

Creates a variable that cannot be observed

Creates a variable that only changes once

None

14.

What is the benefit of state hoisting?

To directly manipulate state from child functions

To prevent recomposition in child composables

To make a composable function stateless and easier to reuse

To keep state local to a single composable function

None

15.

What is the role of the onTextChange function in a TextField?

To initialize the TextField with default text

To prevent the TextField from being modified

To update the state value when text changes

To save the text input across configuration changes

None

16.

What is the primary purpose of using the by keyword with state variables in Compose?

To prevent state variables from changing

To make code more concise when accessing state values

To initialize state variables with a default value

To save state during configuration changes

None

17.

Why is remember used when declaring a state variable?

To ensure that the state is re-initialized with each recomposition

To enable the state to persist through configuration changes

To prevent the state from being updated

To remember the state value across recompositions

None

18.

What is unidirectional data flow in Compose?

A method of preventing recomposition in Compose

An approach where state flows downwards and events flow upwards

A technique where child composables can modify parent state directly

A way to save state during configuration changes

None

19.

Which function is best suited for saving state during configuration changes like screen rotations?

rememberSaveable

statefulCompose

remember

mutableStateOf

None