This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.
Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:
getTweetsFor("domenic", function (err, results) {
// the rest of your code goes here.
(by @andrestaltz)
If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.
| (defrecord Server [service-map] | |
| component/Lifecycle | |
| (start [component] | |
| (info :msg "Starting server.") | |
| (let [server (bootstrap/create-server (:service-map service-map))] | |
| (bootstrap/start server) | |
| (assoc component :server server))) | |
| (stop [component] | |
| (info :msg "Stopping server.") | |
| (update-in component [:server] bootstrap/stop))) |
Assorted notes from learning and experimenting with Fulcro.