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ReactJS Quiz
Test your knowledge of ReactJS, frontend development, and JavaScript with this quiz!
What is a state in React?
A JavaScript object that stores component data
A React lifecycle method
A built-in React component
A React component that handles user input
What is the purpose of the componentWillUnmount() method in React?
A. To perform cleanup before the component is unmounted
B. To initialize the component before mounting
C. To update the component's state after mounting
D. To render the component to the DOM
What is the difference between React and Angular?
They are the same
React is a library, Angular is a framework
They are both frameworks
Angular is a library, React is a framework
What is the difference between React Native and ReactJS?
React Native is for mobile development, ReactJS is for web development
ReactJS is for mobile development, React Native is for web development
React Native is a newer version of ReactJS
They are the same
What is a React component?
A class that extends Component
A class that extends React.Component
A function that returns HTML
A function that returns JSX
What is the purpose of the componentDidMount() method in React?
To define the component's props
To perform actions after the component is mounted
To render the component
To update the component's state
What is the purpose of the render() method in React?
To handle user input
To update the component's state
To define the component's lifecycle
To render the component's UI
What is the difference between props and state in React?
Props are read-only, state is mutable
They are the same
State is read-only, props are mutable
They are both mutable
What is the virtual DOM in React?
A lightweight copy of the actual DOM
A mechanism for optimizing DOM updates
A separate DOM tree for tracking changes
A representation of the actual DOM
What is JSX?
JavaScript XML
JavaScript Extension
JavaScript Syntax
JavaScript eXtension
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