Google’s Area 120 has released a new smartphone app designed to teach beginners how to write code. It’s called Grasshopper, and it kind of feels like Duolingo for coding.

Let’s add face detection to our React map explorer app using the pico.js JavaScript library ...

Note that the starter app uses Babel to compile your JSX and ES6 into JavaScript and Webpack to bundle your JavaScript, but hides them from you to reduce the frustration of setting them up.