Reactive Extensions (Rx) originated in the .NET world, devised and built by Erik Meijer and his team at Microsoft, Rx is a library to compose asynchronous and event-based programs. Available, among other languages, for Javascript(RxJS) it is meant for usage in frontend and backend programming. In this session we will see an introduction to Rx, why it is so useful to deal with async computation and how you can use RxJS in your code.