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