How Well Do You Know React?

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Questions and Answers

What is the purpose of props in React?

To pass data between components (correct)

To reference a React component or DOM element

To provide a unique identifier for each element in an array

To manage a component's internal data

What is the purpose of props in React?

To pass data from a child component to a parent component (correct)

To access the properties and methods of a child component from a parent component

To manage a component's internal data

To define routes for different URLs

What is React?

A back-end JavaScript library for building user interfaces for single-page applications. (correct)

A database management system for single-page applications.

A programming language for building mobile applications.

A front-end JavaScript library for building user interfaces for multi-page applications.

What is the difference between state and props in React?

Props are used to pass data between components, while state is used to manage a component's internal data Signup and view all the answers

When was React created?

2011 Signup and view all the answers

What is the difference between state and props in React?

Props are used to pass data between components, while state is used to manage a component's internal data Signup and view all the answers

What is the significance of keys in React?

Keys are a unique identifier assigned to each element in an array. Signup and view all the answers

Where was React first deployed?

Facebook's News Feed Signup and view all the answers

What is the purpose of keys in React?

To identify which items have changed, added, or removed from a list Signup and view all the answers

What is the purpose of refs in React?

To reference a React component or DOM element Signup and view all the answers

What does React use instead of real DOM?

Virtual DOM Signup and view all the answers

What is the significance of ref in React?

Ref is used to reference a React component or DOM element. Signup and view all the answers

What is Redux?

A state management library for JavaScript applications Signup and view all the answers

What is JSX?

A syntax extension to ECMAScript Signup and view all the answers

What is Redux and how does it work with React?

Redux is a state management library for JavaScript applications that provides a predictable state container and helps manage the state of an application in a single, immutable object called the store Signup and view all the answers

What is an element in React?

A plain object describing what should appear on the screen Signup and view all the answers

What is React Router and how does it work?

React Router is a popular routing library for React applications that allows developers to define routes for different URLs and render different components based on the current URL. Signup and view all the answers

What is the purpose of middleware in Redux?

To handle asynchronous actions and other side effects Signup and view all the answers

What is the purpose of the connect() function provided by the react-redux library?

To connect React components to the Redux store, allowing them to access the state and dispatch actions. Signup and view all the answers

What is React Router?

A popular routing library for React applications Signup and view all the answers

How many ways are there to create a component in React?

Two Signup and view all the answers

Study Notes

React is a front-end JavaScript library for building user interfaces for single-page applications.
It was created by Facebook in 2011 and first deployed on Facebook's News Feed.
React uses JSX syntax and virtual DOM instead of real DOM.
It supports server-side rendering and follows unidirectional data flow.
JSX is an XML-like syntax extension to ECMAScript that provides syntactic sugar for React.createElement function.
An element is a plain object describing what should appear on the screen, while a component can be declared in several ways and returns a JSX tree as the output.
There are two ways to create a component: function components and class components.

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Description

Test your knowledge on React, the popular front-end JavaScript library used for building single-page applications. Learn about its history, syntax, virtual DOM, server-side rendering, data flow, JSX, elements, and components. Take the quiz to see if you're a React pro!