With the rise of client-side frameworks you might wonder if your days using Ruby are numbered. You came to Ruby for its expressiveness and beauty. You don’t want to leave that completely behind. Luckily, you don’t have to. With a nod to the Single Responsibility Principle we all love, this talk looks at how to leverage a front-end framework like Ember.js to handle application state at the UI layer and leave Ruby or Rails to do what it does best — everything else. Something to keep in mind: that everything else is the heart of your entire app.