On Mar 14, 8:15 pm, Daniel Solano Gomez <cloj...@sattvik.com> wrote: > I believe there are two approaches to doing this in Clojure: > > 1. Multimethods:http://clojure.org/multimethods > 2. Protocols:http://clojure.org/Protocols > > Of the two, as of Clojure 1.2, protocols are the preferred way of doing > things.
What? Who says they're preferred? Prefer the one that is simplest, unless you really need performance, in which case use protocols. > They handle the simplest and most common case of polymorphism: by type. ;; snip protocol suggestions, which were fine I might be inclined to do this as a multimethod dispatching on the number of points in the shape. Maybe I represent my shape as a vector: [[p1, p2, ...] more-data]. Then I can write: (defmulti draw (fn [pts & more] (count pts)) (defmethod draw 1 [[center] radius] (do stuff with these)) (defmethod draw 2 [[p1 p2]] (draw a line)) (defmethod draw 3 [[p1 p2 p3] filled?] (draw a triangle)) ... (defmethod draw :default [points] (connect up all the points)) In fact a lot of the methods won't need to even be written, because :default can handle them by just drawing lines from point to point. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
