by shany.leannon
Dive into the world of React, the powerful JavaScript library that has transformed the way we build user interfaces. This quiz will test your knowledge on a variety of topics, from the fundamentals to more advanced concepts. Ready to see how much you know about React? Let’s get started and put your skills to the test!
We recommend that you do not leave the page that you are taking this quiz in. Stay honest 🙂
React Quiz Questions Overview
1. What is React primarily used for?
Building user interfaces
Server-side scripting
Database management
Mobile app development
2. Who developed React?
Google
Microsoft
Facebook
Apple
3. What is JSX?
A JavaScript library
A CSS preprocessor
A syntax extension for JavaScript
A database query language
4. Which method is used to create components in React?
React.createElement
React.createComponent
React.newComponent
React.makeComponent
5. What is the purpose of the useState hook?
To manage side effects
To create a new component
To manage state in functional components
To handle form submissions
6. What is a higher-order component (HOC) in React?
A component that renders another component
A component that manages state
A component that handles routing
A component that fetches data
7. What does the useEffect hook do?
Manages state
Handles form submissions
Performs side effects in functional components
Creates new components
8. What is the virtual DOM?
A copy of the real DOM
A new type of DOM
A lightweight representation of the real DOM
A database for storing DOM elements
9. What is the purpose of the key prop in React?
To uniquely identify elements in a list
To manage state
To handle form submissions
To create new components
10. What is the context API used for?
To manage state
To handle side effects
To pass data through the component tree without props
To create new components
11. What does the render method do in a React component?
Fetches data from an API
Updates the component’s state
Returns the component’s UI
Handles user events
12. What is the purpose of propTypes?
To manage state
To handle side effects
To validate the types of props passed to a component
To create new components
13. What does the React.memo function do?
Creates a new component
Memoizes a component to prevent unnecessary re-renders
Handles form submissions
Fetches data from an API
14. What is the purpose of the useReducer hook?
To manage side effects
To handle form submissions
To manage state using a reducer function
To create new components
15. What is the difference between a controlled and uncontrolled component?
Controlled components manage their own state, while uncontrolled components do not
Controlled components rely on props, while uncontrolled components do not
Controlled components are stateless, while uncontrolled components are stateful
Controlled components have their state managed by React, while uncontrolled components manage their own state
16. What is the purpose of the useRef hook?
To manage state
To handle side effects
To create a reference to a DOM element
To create new components
17. What is the purpose of the React.Fragment component?
To manage state
To handle side effects
To group multiple elements without adding extra nodes to the DOM
To create new components
18. What is the purpose of the useContext hook?
To manage state
To handle side effects
To access the value of a context
To create new components
We recommend that you do not leave the page that you are taking this quiz in. Stay honest 🙂
