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Mastering React

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Questions and Answers

Which of the following best describes how React updates the user interface?

React creates a new virtual DOM for every user interaction.

React compares the virtual DOM to the actual DOM and only updates the parts that have changed. (correct)

React updates the entire virtual DOM whenever a user interacts with the app.

React updates the entire page whenever a user interacts with the app.

What is the purpose of the virtual DOM in React?

To improve the performance of the app by reducing the number of DOM updates.

To compare with the actual DOM and update only the changed parts. (correct)

To create a representation of the DOM in memory.

To update the entire DOM whenever a user interacts with the app.

What is required to use React in production?

Node.js and npm (correct)

A web server

A build of the app

All of the above

Which tool do you need to install in order to generate a basic React app template?

create-react-app (C) Signup and view all the answers

What command should you run in your terminal to install create-react-app?

npm install -g create-react-app (A) Signup and view all the answers

What is the name of the folder that will be created when you use create-react-app to generate a new React app?

my-react-app (C) Signup and view all the answers

Which command should you run in your terminal to start a React app on your local machine?

npm start (C) Signup and view all the answers

What is the URL where you can see your React app running on your local machine?

<a href="http://localhost:3000">http://localhost:3000</a> (C) Signup and view all the answers

What command should you use to change directories in the terminal?

cd (A) Signup and view all the answers

Study Notes

React Fundamentals

React updates the user interface by comparing the virtual DOM with the real DOM and only updating the parts that have changed.

Virtual DOM

The purpose of the virtual DOM is to optimize rendering by allowing React to compare the virtual DOM with the real DOM and only update the parts that have changed.

React in Production

To use React in production, a bundler like Webpack or Rollup and a compiler like Babel are required.

Creating a React App

To generate a basic React app template, you need to install create-react-app.
The command to install create-react-app is npx create-react-app my-app (replace "my-app" with your app's name).
When you use create-react-app to generate a new React app, a folder with the same name as your app will be created.

Running a React App

To start a React app on your local machine, run the command npm start in your terminal.
Your React app will be accessible at <a href="http://localhost:3000">http://localhost:3000</a>.

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Description

Test your knowledge on how React works with this quiz! Learn about the virtual DOM, how React updates user interfaces, and the specific parts of the DOM that React modifies.