Mathias Brandewinder on .NET, F#, VSTO and Excel development, and quantitative analysis / machine learning.
by Mathias 19. October 2013 10:33

A couple of weeks ago, I had the pleasure to attend Progressive F# Tutorials in NYC. The conference was fantastic – two days of hands-on workshops, great organization by the good folks at SkillsMatter, Rickasaurus and Paul Blasucci, and a great opportunity to exchange with like-minded people, catch up with old friends and make new ones.

As an aside, if you missed NYC, fear not – you can still get tickets for Progressive F# Tutorials in London, coming up October 31 and November 1 in London.

After some discussion with Phil Trelford, we decided it would be a lot of fun to organize a workshop around PacMan. Phil has a long history with game development, and a lot of wisdom to share on the topic. I am a total n00b as far as game programming goes, but I thought PacMan would make a fun theme to hack some AI, so I set to refactor some of Phil’s old code, and transform it into a “coding playground” where people could tinker with how PacMan and the Ghosts behave, and make them smarter.

Long story short, the refactoring exercise turned out to be a bit more involved than what I had initially anticipated. First, games are written in a style which is pretty different from your run-of-the-mill business app, and getting familiar with a code base that didn’t follow a familiar style wasn’t trivial.

So here I am, trying to refactor that unfamiliar and somewhat idiosyncratic code base, and I start hitting stuff like this:

let ghost_starts = 
     [
         "red", (16, 16), (1,0)
         "cyan", (14, 16), (1,0)
         "pink", (16, 14), (0,-1)
         "orange", (18, 16), (-1,0)
     ]
     |> List.map (fun (color,(x, y), v) -> 
         // some stuff happens here
         { … X = x * 8 - 7; Y = y * 8 - 3; V = v; … }
     )

This is where I begin to get nervous. I need to get this done quickly, and factor our functions, but I am really worried to touch any of this. What’s X and Y? Why 8, 7 or 3?

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