State management comparison in React Native - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a state variable using React Native hooks.

React Native

const [count, [1]] = useState(0);

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

AsetCount

BgetCount

CcountSetter

DupdateCount

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong function name that does not start with 'set'.

Confusing the state variable with the update function.

The useState hook returns a pair: the current state and a function to update it. The convention is to name the update function starting with 'set'.

2fill in blank

medium

Complete the code to update the state variable when a button is pressed.

React Native

const increment = () => [1](prev => prev + 1);

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

Acount

BchangeCount

CupdateCount

DsetCount

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to update the state variable directly instead of using the update function.

Using the wrong function name.

To update the state, you call the update function returned by useState. Here, setCount is called with a function that increments the previous value.

3fill in blank

hard

Fix the error in the code to correctly use the useReducer hook for state management.

React Native

const [state, [1]] = useReducer(reducer, initialState);

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

Adispatch

BsetState

CupdateState

DchangeState

Attempts:

3 left

💡 Hint

Common Mistakes

Using setState instead of dispatch with useReducer.

Confusing useReducer with useState syntax.

When using useReducer, the second element is the dispatch function used to send actions to the reducer.

4fill in blank

hard

Fill both blanks to create a context provider and consume the context in a child component.

React Native

const MyContext = createContext();

function MyProvider({ children }) {
  const [value, [1]] = useState('Hello');
  return <MyContext.Provider value=[2]>{children}</MyContext.Provider>;
}

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

AsetValue

Bvalue

C{ value, setValue }

DupdateValue

Attempts:

3 left

💡 Hint

Common Mistakes

Passing only the state value without the setter function.

Using incorrect variable names.

The provider needs to pass the state and the update function as an object to allow consumers to read and update the context value.

5fill in blank

hard

Fill all three blanks to correctly use the useContext hook inside a functional component.

React Native

function MyComponent() {
  const context = useContext([1]);
  return <Text onPress={() => [2]('New Value')}>{context.[3]</Text>;
}

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

AMyContext

BsetValue

Cvalue

DOtherContext

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong context object in useContext.

Trying to update the state variable directly instead of using the setter.

Inside the component, useContext is called with the context object. Then you can use the setter function to update the value and display the current value.