React Interview

What is React?

• A library for handling HTTP requests

• A library for building user interfaces

• A database management system

• A CSS preprocessor

What are components in React?

• Reusable UI elements

• The logic part of React

• Database structures

• React's core library code

What is JSX?

• JavaScript extension

• HTML preprocessor

• XML-like syntax to write React components

• JavaScript compiler

What is the difference between functional and class components?

• Functional components are stateful

• Functional components are stateless

• Class components are only for styling

• Class components can't manage state

How do you pass data to components in React?

• Through props

• Through events

• Through context

• Directly by DOM manipulation

What is the correct syntax for using a prop in a functional component?

• this.props.name

• props.name

• {props}.name

• props().name

What is the use of `useState` in React?

• To manage component lifecycle

• To manage component state in functional components

• To bind event handlers

• To handle API requests

Which hook is used for side effects in React?

• useState

• useEffect

• useContext

• useReducer

What does `useEffect` do?

• Handles event listeners

• Fetches data and runs side effects

• Manages state

• Handles component updates

How are state updates managed in functional components?

• this.setState

• useState()

• setEffect()

• setReducer()