I am currently giving some lectures about Clojure to a group of students. One of the Lisp features I promote to them is the ability to write language in the language itself. So during the lecture when I talked about multimethods one student asked if one could write own multimethods implementation if Clojure didn't have them. I went all like "Sure, you just..." and stuck. My first thought was to save multimethod into an atom and the list of methods into metadata of that atom, but as I found out atoms cannot hold metadata. Desperately I looked into Clojure sources for implementation of multimethods and saw that it is done using the MultiFn Java object. I guess this is done for performance and there is still a way do this in pure Clojure (I mean, in pure Lisp). Thanks in advance for helping!
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