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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?
B. To initialize the component before mounting
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
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 update the component's state
To handle user input
To render the component's UI
To define the component's lifecycle
What is JSX?
JavaScript Extension
JavaScript eXtension
JavaScript Syntax
JavaScript XML
What is the difference between props and state in React?
They are the same
They are both mutable
Props are read-only, state is mutable
State is read-only, props are mutable
What is a state in React?
A built-in React component
A React component that handles user input
A JavaScript object that stores component data
A React lifecycle method
What is the difference between React and Angular?
They are the same
Angular is a library, React is a framework
They are both frameworks
React is a library, Angular is a framework
What is the difference between React Native and ReactJS?
ReactJS is for mobile development, React Native is for web development
React Native is a newer version of ReactJS
They are the same
React Native is for mobile development, ReactJS is for web development
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 a React component?
A class that extends React.Component
A class that extends Component
A function that returns JSX
A function that returns HTML
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