The only thing that's missing is JavaScript. We can generate that also with ClojureScript (https://github.com/clojure/clojurescript). This is an implementation of Clojure that compiles to JavaScript.
Why would we want to write JavaScript in Clojure? First, it simplifies our project when both the client and the server are written in the same language. It also allows us to share code between the two sides of our application, which can cut down on the complexity of our code, as well as the lines of the code.
For the rest of this chapter, we'll be creating charts and graphs using ClojureScript. These recipes will show us how to install it and get it working. We'll take the web application we started in the Serving data with Ring and Compojure recipe and the Creating HTML with Hiccup recipe and add an alert to the index page. This isn't anything more than a hello world application, but it will prove that ClojureScript is working in our application.