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 is recomposition in the context of Compose?

The creation of new composable functions

The process of saving state through configuration changes

The initialization of variables in a new project

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

None

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

The state will be retained across recompositions

The state will trigger recompositions

The state will be re-initialized on every recomposition

The state will be preserved through configuration changes

None

What happens when a configuration change occurs in Compose?

The activity is destroyed and recreated with new state values

Only the affected composable functions are recomposed

State values are preserved automatically

The app continues without any change

None

What is the benefit of state hoisting?

To keep state local to a single composable function

To prevent recomposition in child composables

To directly manipulate state from child functions

To make a composable function stateless and easier to reuse

None

What is the advantage of using a stateless composable?

It is tightly coupled to its parent

It cannot be reused in other parts of the app

It is simpler and easier to test

It directly manipulates state without needing event handlers

None

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

setState

mutableStateOf

saveableState

statefulCompose

None

Why is intelligent recomposition important in Compose?

It prevents any recompositions from occurring

It recomposes the entire UI on every state change

It allows state to be modified directly by child functions

It recomposes only functions directly affected by state changes

None

How can state be made accessible to multiple child composables?

By using multiple state variables in each child

By ignoring recomposition in child components

By hoisting state to the closest common ancestor

By declaring state directly in each child

None

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

Allowing state to be shared among multiple child composables

Retaining state through recompositions

Ensuring state is only remembered during initial rendering

Making a child composable directly manipulate state

None

10.

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

To prevent state variables from changing

To initialize state variables with a default value

To make code more concise when accessing state values

To save state during configuration changes

None

11.

When should you consider using rememberSaveable instead of remember?

When state needs to be retained through device rotations

When recomposition should be prevented

When initializing variables with default values

When state should not persist across configuration changes

None

12.

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

remember

mutableStateOf

statefulCompose

rememberSaveable

None

13.

What is state in Compose?

A value that remains constant throughout the app lifecycle

A value that only changes during app initialization

A standard variable that changes during execution

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

None

14.

Why is remember used when declaring a state variable?

To remember the state value across recompositions

To enable the state to persist through configuration changes

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

To prevent the state from being updated

None

15.

What does mutableStateOf do?

Creates a variable that only changes once

Creates a state variable that triggers recomposition when updated

Creates a state variable that cannot be changed

Creates a variable that cannot be observed

None

16.

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

To prevent the TextField from being modified

To save the text input across configuration changes

To initialize the TextField with default text

To update the state value when text changes

None

17.

What is unidirectional data flow in Compose?

A method of preventing recomposition in Compose

A technique where child composables can modify parent state directly

A way to save state during configuration changes

An approach where state flows downwards and events flow upwards

None

18.

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

It is used for saving state to a database

It does not allow state to change

It only retains state through recompositions, not configuration changes

It automatically saves state through configuration changes

None

19.

What does the rememberSaveable function do?

Prevents state changes during recomposition

Ensures that state is only remembered during the initial run

Re-initializes state after every recomposition

Retains state across recompositions and configuration changes

None