Digital Moose Tracks » F# http://digitalmoosetracks.com/blog .Net, MythTV and Me Mon, 08 Mar 2010 06:24:50 +0000 en hourly 1 http://wordpress.org/?v=3.3.2 F# Active Patterns as function parameters http://digitalmoosetracks.com/blog/f-active-patterns-as-function-parameters http://digitalmoosetracks.com/blog/f-active-patterns-as-function-parameters#comments Thu, 23 Jul 2009 23:33:09 +0000 joshua http://digitalmoosetracks.com/blog/f-active-patterns-as-function-parameters When I first learned about active patterns in F# I thought they were pretty great.  Then I saw you this F# video and learned you can patterns as function parameters.  This lets you do stuff like the following. (note I stole the example from this F# video)

open System.Drawing

let (|RGB|) (color : Color) = (color.R, color.G, color.B)

let printRGB (RGB(r, g, b)) =
    printfn "%d, %d, %d" r g b

printRGB Color.Red

I find this especially cool because I often have a wrapper function to do this sort of data transformation and this is far more elegant.

]]> http://digitalmoosetracks.com/blog/f-active-patterns-as-function-parameters/feed 0