Creating and running a React app

When we have Node.js and the code editor installed, we are ready to create our first React.js app. We are using Facebook's create-react-app (https://github.com/facebook/create-react-app) for that. Here are the steps to make your first app:

1. Open PowerShell or the command-line tool and type the following command. The command installs the create-react-app starter, which we will use to develop React apps. Parameter -g in the command means that installation is done globally.

If you are using npm version 5.2 or higher, you can also use npx instead of npm:

npm install -g create-react-app

2. After the installation is complete, we create our first app by typing the following command:

create-react-app myapp

3. After the app has been created, move it into your app folder:

cd myapp

4. Then we can run the app with the following...