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?

<p>Props are used to pass data between components, while state is used to manage a component's internal data (D)</p> Signup and view all the answers

When was React created?

<p>2011 (D)</p> Signup and view all the answers

What is the difference between state and props in React?

<p>Props are used to pass data between components, while state is used to manage a component's internal data (D)</p> Signup and view all the answers

What is the significance of keys in React?

<p>Keys are a unique identifier assigned to each element in an array. (B)</p> Signup and view all the answers

Where was React first deployed?

<p>Facebook's News Feed (C)</p> Signup and view all the answers

What is the purpose of keys in React?

<p>To identify which items have changed, added, or removed from a list (C)</p> Signup and view all the answers

What is the purpose of refs in React?

<p>To reference a React component or DOM element (A)</p> Signup and view all the answers

What does React use instead of real DOM?

<p>Virtual DOM (A)</p> Signup and view all the answers

What is the significance of ref in React?

<p>Ref is used to reference a React component or DOM element. (B)</p> Signup and view all the answers

What is Redux?

<p>A state management library for JavaScript applications (B)</p> Signup and view all the answers

What is JSX?

<p>A syntax extension to ECMAScript (C)</p> Signup and view all the answers

What is Redux and how does it work with React?

<p>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 (A)</p> Signup and view all the answers

What is an element in React?

<p>A plain object describing what should appear on the screen (D)</p> Signup and view all the answers

What is React Router and how does it work?

<p>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. (C)</p> Signup and view all the answers

What is the purpose of middleware in Redux?

<p>To handle asynchronous actions and other side effects (D)</p> Signup and view all the answers

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

<p>To connect React components to the Redux store, allowing them to access the state and dispatch actions. (D)</p> Signup and view all the answers

What is React Router?

<p>A popular routing library for React applications (D)</p> Signup and view all the answers

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

<p>Two (A)</p> Signup and view all the answers

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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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