React whaaaaa!!!

So getting back into mobile development I heard about a new way to "do" apps so that they run on iOS and Android and it's called React.js. My friend told me about it and then I saw this Code Academy module and thought this might be interesting.

I don't really have a lot of experience at JavaScript but the first half of the module seems straight forward enough, and it seems interesting how react.js keeps track of virtual DOM elements, and then only re-renders DOM elements when they change; as opposed to re-rendering everything all-da-time. This is supposed to make it super performance efficient and I'm excited to see how it works out in practice.