On Tue, Mar 15, 2011 at 12:58 PM, Armando Blancas
<armando_blan...@yahoo.com> wrote:
> Another choice is to construct shapes as closures with auto-dispatch.
> So a circle could be made thus, with no data structure per se:
>
> (defn make-circle [x y r]
> (fn [method]
> (case method
> :draw (fn [color] ...)
> :rotate (fn [degrees] ...)
> :r (fn [] r)
> :x (fn [] x)
> :y (fn [] y))))
And then, of course, there's this Smalltalkesque dispatch model. All
it needs to complete the picture are a couple of default cases:
:DoesNotUnderstand (throw
(IllegalArgumentException.
(str
"make-circle DoesNotUnderstand: "
method)))
(recur :DoesNotUnderstand)
:)
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