9 Questions
Which of the following best describes how React updates the user interface?
React compares the virtual DOM to the actual DOM and only updates the parts that have changed.
What is the purpose of the virtual DOM in React?
To compare with the actual DOM and update only the changed parts.
What is required to use React in production?
Node.js and npm
Which tool do you need to install in order to generate a basic React app template?
create-react-app
What command should you run in your terminal to install create-react-app?
npm install -g create-react-app
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
Which command should you run in your terminal to start a React app on your local machine?
npm start
What is the URL where you can see your React app running on your local machine?
What command should you use to change directories in the terminal?
cd
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 startin your terminal. - Your React app will be accessible at
<a href="http://localhost:3000">http://localhost:3000</a>.
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.
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