Learn Functional Programming With Me - A Mission Statement

Published on 2012-6-11

I was at NDC2012 last week and ended up hanging around the tongue-in-cheek "Hipster stand" along with a fine bunch of people who sat around coding and chatting most of the week on various interesting projects.

One of those fine people was @bodiltv who proclaimed their love for Lisp, Emacs and various other things that I thought (like most people) I'd left behind after university never to touch again.

However, functional programming is something that is seeing somewhat of a re-emergence in the crowds of people who I tend to lump into a bucket of "Smarter than Rob", and I was looking for an excuse to give it a go - having to build something with somebody sat next to me to show me the ropes was an excellent motivator.

Over the course of a couple of hours on Thursday, @bodiltv and I sat down and wrote a simple little script that looks something like this:

(ns foo.core 
(:use [net.cgrand.enlive-html :as html])  
)

(def BASEURL "https://en.wikipedia.org/wiki/")

(defn fetch-url [url]
  (html/html-resource (java.net.URL. url)))

(defn define
  "Fetches a page from wikipedia and prints the first paragraph"
    [q]
      (let [url (str BASEURL q)
           content (fetch-url url)]
           ((comp html/text
                  first
                  html/select) content [:#mw-content-text :p])
      )
)

We also then looked at futures and how such things like that could help us, and with the knowledge of state being immutable know that we were safe when doing so. I then asked the question that most people ask when encountering this stuff for the (first/second) time, "How on earth do you build something real with this stuff".

So here goes, a mission statement - I am going to build space invaders on top of HTML5 Canvas with Clojurescript.

Yes, I am breaking out the blog again and relying on YOU, the reader who knows more about these things than I do to guide me on my way as I inevitably make lots of mistakes.

It's hard to do this, because on the surface of things it seems so far away from the style of development I am used to, but by learning out in the open I am hoping we'll accelerate the process of getting to the point where I can be productive in a functional environment.

Next entry: Let's see what my environment is going to look like, how I am going to interact with the Canvas and structure myself during this experiment.

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