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How do you connect a React component to the Redux store?

Using connect
Using useState
Using useEffect
Using useContext

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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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In React, what is the purpose of keys in arrays of elements?

To uniquely identify each element in the array
To provide styling information
To store component data
To specify element hierarchy

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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 events in React?

Using addEventListener
Using on prefix in JSX
Using handleEvent method
Using event method

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

To update the component's state based on props changes
To initialize the component's state
To perform side effects after rendering
To handle component errors

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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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How do you create a context in React?

Using React.createContext
Using useContext
Using useEffect
Using useReducer

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What is the purpose of the 'ref' attribute in React?

To reference external JavaScript files
To create a reference to a DOM element or a React component
To define component dependencies
To specify component props

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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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Who developed React.js?

Google
Apple
Facebook
Microsoft

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What is React.js primarily used for?

Data analysis
UI development
Database management
Machine learning

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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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How do you handle forms in React?

Using Redux
Using refs
Using state
Using Context API

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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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How do you update state in a functional component?

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

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

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

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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 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 '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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What is React Router used for?

Managing state
Making API calls
Handling routing in a React application
Styling components

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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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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 fetch data in a React component?

Using fetch
Using axios
Using useEffect
All of the above

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How can you prevent a component from rendering in React?

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

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Which of the following is NOT a valid lifecycle method in React?

componentWillMount()
componentWillUpdate()
componentDidReceiveProps()
componentWillUnmount

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Which of the following is NOT a way to handle events in React?

Inline event handlers
Event delegation
Event listeners
Synthetic events

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What does setState do in a class component?

Directly changes state
Merges the old and new state
Deletes the state
Calls the render method

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What hook is used to manage state in a functional component?

useContext
useEffect
useReducer
useState

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