Ahh, of course. Ouch, that was embarrassingly elementary. Thanks. On Sunday, August 25, 2013 3:13:12 PM UTC-7, Lee wrote: > > > On Aug 25, 2013, at 5:42 PM, ngieschen wrote: > > > > mapcat's signature is (f & colls) which indicates to me I should be able > to so something like (mapcat #(list (inc %)) [1 2 3] [4 5 6]). That is, > doesn't the & indicate that I can pass in a variable number of colls? > However, if I do, it crashes and burns, since internally it's calling > (apply map #(list (inc %)) '([1 2 3] '[4 5 6])), which, as expected, throws > an ArityException. > > > > So, am I missing something or is mapcat's signature wrong? It seems to > me it should be (f colls) and not (f & colls). > > mapcat is happy with a variable number of args, but the function that > you're mapping down those multiple args doesn't have the right arity. > > Try: > > (mapcat #(list (inc %1) (inc %2)) [1 2 3] [4 5 6]) > > -Lee
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