React State Management Mastery Quiz Quiz

1. Component State

   In React, which hook is primarily used to manage local component state?

   1. useState
   2. useReducer
   3. useContext
   4. useMemo
   5. useStates

2. Lifting State Up

   What does 'lifting state up' refer to in React component design?

   1. Moving state to a parent component to share with its children.
   2. Moving state to a child component from its parent.
   3. Deleting state entirely.
   4. Moving state to a global store.
   5. Moving state to a CSS stylesheet.

3. Props Drilling

   What is 'props drilling' and why is it generally discouraged in React applications?

   1. The process of passing props through multiple levels of components, leading to code that is harder to maintain.
   2. A technique for optimizing component rendering by preventing unnecessary re-renders.
   3. A method for dynamically styling React components using CSS-in-JS.
   4. A pattern for creating reusable components that can be easily customized.
   5. A way of efficiently managing multiple states in React.

4. Context API

   Which React API is best suited for sharing state that is considered 'global' for a tree of React components?

   1. Context API
   2. Props
   3. Local State
   4. Refs
   5. useGlobal

5. Context Provider

   What React component is used to provide data to all consuming components using the Context API?

   1. Context.Provider
   2. Context.Consumer
   3. Context.Wrapper
   4. Context.Connect
   5. Context.Distributor

6. Context Consumer

   How can a component access the value provided by a Context Provider?

   1. Using the useContext hook.
   2. By directly accessing a global variable.
   3. By importing the context value directly.
   4. Using props passed down from the Provider.
   5. Using the useContxt hook.

7. State Immutability

   Why is it important to treat state as immutable in React?

   1. To allow React to efficiently detect changes and re-render components.
   2. To prevent memory leaks.
   3. To ensure that the user interface always reflects the current state of the application.
   4. To simplify debugging and testing.
   5. To improve code readability.

8. useState Initial Value

   What happens if you provide a function to 'useState' as initial value?

   1. The function is executed only on the initial render and its return value becomes the initial state.
   2. The function is executed on every render.
   3. An error is thrown.
   4. The component will not re-render.
   5. The function will update the component based on the state.

9. useReducer Hook

   For complex state logic, which React hook is often preferred over useState?

   1. useReducer
   2. useEffect
   3. useContext
   4. useMemo
   5. useCallback

10. Avoiding unnecessary re-renders

    Which technique can be used to prevent child components from re-rendering when the parent component re-renders but the props passed to the child haven't changed?

    1. React.memo
    2. ShouldComponentUpdate
    3. PureComponent
    4. All of the above
    5. None of the above