What is the purpose of the virtual DOM?

To efficiently update and render UI components

What is the difference between React function components and class components?

Function components use hooks, while class components use lifecycle methods

What is the purpose of React Fragments?

To group multiple React components together

What is the purpose of React DevTools?

To debug and inspect React component hierarchy

What is the purpose of the "render" method in a React Class component?

To define the component's UI structure

A JavaScript framework for building user interfaces.

What is a component in React?

A reusable building block for UI elements in React

What is the purpose of React Hooks?

To manage state and lifecycle in functional components

What is the purpose of the React Router library?

To navigate and render different components based on the URL

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

To uniquely identify elements in a list

What is JSX in React?

Extension for JavaScript that allows writing HTML-like code in JavaScript

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Questions 15

Answers

1
Which of the following is NOT a core concept of React.js?
Props
Variables
State
Components
2
What is the purpose of the virtual DOM?
To validate form inputs
To efficiently update and render UI components
To handle server-side rendering
To improve website accessibility
3
Which lifecycle method is called after a component is rendered for the first time?
componentWillReceiveProps()
componentDidMount()
componentWillMount()
componentDidUpdate()
4
What is the difference between React function components and class components?
Class components can have state, while function components cannot.
There is no difference; they can be used interchangeably.
Function components use hooks, while class components use lifecycle methods
Function components are more performant than class components.
5
What is the purpose of React Fragments?
To group multiple React components together
To conditionally render elements in React
To improve performance in React rendering
To create reusable code snippets in React
6
What is the purpose of React DevTools?
To optimize website performance
To automate testing of React applications
To debug and inspect React component hierarchy
To generate documentation for React components
7
Which hook is used in React.js to manage state in functional components?
useEffect()
setState()
useState()
useReducer()
8
What is the purpose of the "render" method in a React Class component?
To update the component's state
To handle user interactions and events
To define the component's UI structure
To fetch data from an API
9
What is React.js?
A programming language used for server-side scripting.
A database management system.
An operating system for mobile devices.
A JavaScript framework for building user interfaces.
10
What is a component in React?
A tool for managing state in React applications
A predefined function in React for handling user events
A programming construct for creating loops in React
A reusable building block for UI elements in React
11
What is the purpose of React Hooks?
To introduce functional programming concepts in React
To handle asynchronous operations in React
To improve performance in React applications
To manage state and lifecycle in functional components
12
What is the purpose of the React Router library?
To handle HTTP requests and APIs
To perform form validation in React forms
To manage state in React components
To navigate and render different components based on the URL
13
Which of the following is a way to pass data between parent and child components in React?
UseState()
Props
State
A Reducer
14
What is the purpose of the "key" prop in React?
To define the component's display name
To uniquely identify elements in a list
To control the rendering of child components
To specify the initial state of a component
15
What is JSX in React?
A CSS-in-JS solution for styling React components
A tool for automating build processes in React applications
Extension for JavaScript that allows writing HTML-like code in JavaScript
A popular JavaScript library used for data manipulation

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