procrastination.js makes it easy to create realtime web applications using pure Javascript, by replacing the old callback paradigm, by a stream of events called a Reactive. You're not working on discrete events anymore, but with a continuous, possibly infinite, list of incoming data of any kind. Reactives have the traditionnal list methods that you are used to, like filter and map, are immutable, and reusable.
Let's say you want to react on keyboard events. What you first need to do, is to create a function that is your Events source:
function key(next){ $(document.body).keydown(next) }
next is a the function that should be called when an new event is raised.
Then you need to create a new Reactive,
Reactive.on(key)
A Reactive won't do anything until call 'subscribe' on it.
Reactive.on(key)
.subscribe()
We now have created our very first reactive :) This one does not do anything, we'll now take a look at Actions.
Let's start with our first reactive:
Reactive.on(key)
.subscribe()