On Fri, 2009-08-21 at 12:50 -0700, Kevin Downey wrote: > user=> (defmulti length empty?) > #'user/length > > user=> (defmethod length true [x] 0) > #<MultiFn clojure.lang.mult...@1807ca8> > > user=> (defmethod length false [x] (+ 1 (length (rest x)))) > #<MultiFn clojure.lang.mult...@1807ca8> > > user=> (length [1 2 3 4]) > 4 > Très cool! This could be applied to Meikel's post as well -- you *can* write your own predicate function that in effect test for values. It will just be -- ugly.
Is there a performance hit with this style (due to using multimethods) or will this be optimized away in practice? -- Michel
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