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What is the purpose of ReactDOM?

To define components
To manage state
To render React components to the DOM
To create context

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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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What is the purpose of the 'componentWillReceiveProps' method in React?

To update the component's props
To initialize the component's state
To perform cleanup before the component is removed
To handle errors during rendering

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Which of the following methods is used to update the state based on the previous state in React?

this.updateState()
this.setState()
this.changeState()
this.modifyState

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How do you define default props in a component?

Using defaultProps
Using props
Using state
Using context

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

componentDidMount()
componentWillMount()
componentWillUpdate()
componentDidUpdate

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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 the purpose of the 'useMemo' 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 StrictMode in React?

To highlight potential problems
To manage state
To fetch data
To handle errors

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What is the purpose of prop-types library?

To type-check props
To handle state
To manage context
To fetch data

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What is prop drilling?

Passing props to multiple components
Updating state in child components
Updating props in parent components
Passing state down multiple levels

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What is JSX?

A JavaScript syntax extension
A type of database
A CSS preprocessor
A testing framework

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How do you handle errors in React components?

Using componentDidCatch
Using useEffect
Using useState
Using render

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Who developed React.js?

Google
Apple
Facebook
Microsoft

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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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How do you update state in a functional component?

Using setState
Using this.state
Using this.setState
Using useState

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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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What is the purpose of useMemo hook?

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

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How do you handle forms with controlled components?

Using value and onChange props
Using defaultValue prop
Using setState
Using useEffect

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

To handle component errors
To define the initial state of a component
To update the component's props
To perform side effects in function components

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How can you optimize performance in React?

By using pure components
By minimizing the use of inline styles
By avoiding unnecessary re-renders
All of the above

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What is Redux used for?

State management
Routing
CSS styling
API calls

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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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How do you lazy load components in React?

Using React.lazy
Using useEffect
Using useContext
Using useState

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What is React.js?

A programming language
A JavaScript library for building user interfaces
A database management system
An operating systemAnswer

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

To specify the index of each item in the list
To uniquely identify each item in the list
To provide styling information for list items
To define the initial state of list items

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What is the purpose of middleware in Redux?

To handle asynchronous actions
To handle synchronous actions
To fetch data
To manage state

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