This post assumes you already have Node.js and npm, as well as the latest version of XCode installed, a favorite code editor, and are running on a the latest Mac OS X.
Run the command
npm install -g expo-cli to install the Expo CLI.
Initialize your first project by running
expo init AwesomeProjectTitle.
cd AwesomeProjectTitle to go to your AwesomeProjectTitle directory.
npm start within this directory.
This will start the development server and open a browser window with options on the left hand side such as ‘run on an ios simulator’. Click on this link.
Let’s open up our project directory in your favorite code editor and go to the
Delete all the JSX related to the welcome screen text, then type “Hello World” in between
Congratulations! You’ve built your first native iOS and Android application!