Basic React

Introduction to JSX

2 Topics | 1 Quiz

Quiz (Introduction to JSX)

React Components

2 Topics | 1 Quiz

Quiz (React Components)

States and Lifecycle

2 Topics | 1 Quiz

Component lifecycle

Quiz (States and Lifecycle)

Functional components vs Class components

2 Topics

Functional Components

Class components

4 Topics | 1 Quiz

Conditional Rendering and Lifting State up

2 Topics

Lifting state up

Data management and Unit Testing

2 Topics

Data management

Quiz (Hooks)

Basic React Hooks Quiz (Hooks)

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Question 1 of 5

1. Question
What’s the difference between useMemo and useCallback
- useMemo is used for caching functions and useCallback is used for caching results.
- useMemo is used for caching results and useCallback is used for caching functions
- useMemo and useCallback are the same but useMemo improves performance better than useCallback.
Question 2 of 5

2. Question
What does useState return?
- A memoized function.
- An array consisting of a state variable and variable setter with an initialized value.
- A memoized result.
- A memoized state variable and state getter.
Question 3 of 5

3. Question
Which hook does the work of componentWillUpdate, componentDidMount and componentWillUnmount?
- useCallback
- useMemo
- useState
- useEffect
Question 4 of 5

4. Question
What are the 2 rules of hooks?
- Hooks should be called at the top and Hooks can be used in class.
- Hooks can only be used in functions and Hooks have to be called on top of the functional component
- Hooks can be called from classes and Hooks can be used anywhere.
Question 5 of 5

5. Question
What is the importance of the useEffect cleanup function and when is it applied?
- Cleanup function is used to remove any data/cancel network calls etc, it usually runs when the component unmounts.
- Cleanup function is used to reset the component, it runs before the new effects are applied to the component.
- Cleanup function is used to remove data/cancel network