Hi all,

I've been reading through clojure.core to see examples of fine clojure
style. One thing I've noticed is (what I consider) a weird notation
when parsing parameters for function. As an example, consider the
function juxt:

(defn juxt
  "Alpha - name subject to change.
  Takes a set of functions and returns a fn that is the juxtaposition
  of those fns.  The returned fn takes a variable number of args, and
  returns a vector containing the result of applying each fn to the
  args (left-to-right).
  ((juxt a b c) x) => [(a x) (b x) (c x)]"
  ([f]
     (fn
       ([] [(f)])
       ([x] [(f x)])
       ([x y] [(f x y)])
       ([x y z] [(f x y z)])
       ([x y z & args] [(apply f x y z args)])))
[ rest of juxt is omitted for brevity ]

I don't understand why there needs to be a case for [x], [x y], [x y
z] and [x y z & args]. Why not just [args]? And why the magic number
(three) of variables?

Thomas

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