This paper presents Flapjax, a language designed for contemporary Web applications. These applications communicate with servers and have rich, interactive interfaces. Flapjax provides two key features that simplify writing these applications. First, it provides event streams, a uniform abstraction for communication within a program as well as with external Web services. Second, the language itself is reactive: it automatically tracks data dependencies and propagates updates along those data?ows. This allows developers to write reactive interfaces in a declarative and compositional style.
The real heroes of this story are my co-authors. Leo, Arjun, and Greg were there for the initial, heroic-effort-based implementation. Jacob and Aleks wrote incredible applications with our dog food. Shriram, of course, saw the whole thing through. Very few of my contributions remain: the original compiler is gone (thank goodness); my thesis work is discussed briefly in How many DOMs? on page 15. Here’s to a great team and a great experience (and a great language)!