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How do you unmount a component in React?

Using componentWillUnmount
Using componentDidMount
Using useEffect
Using setState

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How do you perform conditional rendering in React?

Using if statements
Using for loops
Using ternary operators
Using switch statements

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What does JSX stand for in React.js?

JavaScript XML
JavaScript Extension
JavaScript XQuery
JavaScript External

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What is the purpose of keys in React?

To identify elements uniquely
To set state
To define props
To handle events

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In React, what is the purpose of the 'useReducer' Hook?

To handle component errors
To manage complex state logic
To define the initial state of a component
To perform side effects in function components

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What is the purpose of PropTypes in React?

To specify the type of data expected in props
To define the initial state of a component
To manage component input
To handle component events

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What is the purpose of the 'useCallback' Hook in React?

To memoize expensive calculations
To update the component's state
To handle component errors
To perform side effects in function components

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What is the purpose of state in React?

To store props
To store component metadata
To manage component input
To manage component data that may change

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What is the purpose of the 'key' prop in React?

It specifies the CSS class of an element
It provides a unique identifier for a component in an array
It defines the initial state of a component
It sets the default props of a component

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What is the purpose of the 'useContext' Hook in React?

To update the component's state
To handle component errors
To access React context in function components
To perform side effects in function components

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What is a component in React?

A function that returns JSX
A class that fetches data
A library for routing
A method for state management

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How do you create a controlled component in React?

By using refs
By managing the component state
By setting the 'controlled' attribute
By using event listeners

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What is the difference between props and state in React?

props are mutable, state is not
state is immutable, props are not
props are immutable, state is mutable
props are for functions, state is for classes

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Which of the following Hooks can be used to subscribe to document title changes in React?

useEffect
useMemo
useContext
useDocumentTitle

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In React, what is the purpose of the 'static getDerivedStateFromError' method?

To update the component's state based on errors
To initialize the component's state
To perform cleanup after an error occurs
To handle errors that occur during rendering

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What is a pure component in React?

A component with no side effects
A component that only re-renders when its props change
A component that always re-renders
A component that fetches data

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What is the purpose of useCallback hook?

To memoize functions
To memoize values
To handle side effects
To fetch data

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Which method is called when a component is first added to the DOM?

componentDidMount()
componentWillMount()
componentWillUpdate()
componentDidUpdate

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How can you prevent a component from re-rendering in React?

By using shouldComponentUpdate method
By returning false from the render method
By setting the 'shouldUpdate' attribute to false
By removing the component from the component tree

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How do you pass data to a child component?

Using state
Using props
Using events
Using functions

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In React, what is the purpose of the 'shouldComponentUpdate' method?

To determine if a component should be rendered
To define component lifecycle
To handle component events
To manage component input

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What is the purpose of useRef hook?

To manage state
To create mutable references
To handle side effects
To define context

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What function is used to change the state in React?

this.state()
this.setState()
this.changeState()
this.modifyState

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Which of the following methods is called after the component is rendered in React?

componentWillMount()
omponentDidMount()
componentDidUpdate()
componentWillReceiveProps

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In React, how can you conditionally render components?

Using if-else statements
Using switch statements
Using ternary operators
All of the above

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How do you create a reference to a DOM element in React?

Using createRef
Using useState
Using useEffect
Using useReducer

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In React, what is the purpose of the 'forwardRef' function?

To pass refs to child components
To create refs dynamically
To forward props to child components
To access the DOM node of a child component

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How do you create a class component in React?

class MyComponent extends React.Component
const MyComponent = () => {}
function MyComponent() {}
React.createClass()

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Which of the following statements about React Suspense is true?

It is used to handle errors in React components
It is used to suspend rendering while waiting for data to load
It is deprecated in the latest version of React
It is used to manage component state

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How do you implement code splitting in React?

Using import()
Using require()
Using React.split()
Using React.lazy()

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