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