On Thu, Feb 11, 2010 at 10:27 AM, Laurent PETIT <laurent.pe...@gmail.com>wrote:
> 2010/2/11 Bryce <fiat.mo...@gmail.com>: > > I'm wondering what the rationale is for using multimethods vs. cond, > > and where it's best to use either? Multimethods seem to be very > > seldom used, usually to dispatch on type, but I can see advantages to > > using data to dynamically define only the methods you need, rather > > than having all-encompassing cond statements. It also seems like > > generally cleaner code. Is there a speed benefit to one or the other? > > There is clearly a speed benefit of just using cond, and sometimes it > can be the reason for the choice. > > multimethods help you implement the Open / Close principle : they are > open to users providing more specific implementations for more > specific dispatch values. And for this it is not necessary for the > user of the multimethod to change existing implementations for certain > dispatch values (the close part). > > There's certainly much to say about the differences, but here's my > contribution. > Multimethods also support reflection. David -- 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
