Hey,
When browsing through clojure.core I noticed something peculiar in the
implementation of comp, juxt and partial.
All three share the same implementation pattern. They define separate methods
for the arity of 0,1,2,3 and any.
For example in juxt:
(defn juxt
(…)
([f g]
(fn
([] [(f) (g)])
([x] [(f x) (g x)])
([x y] [(f x y) (g x y)])
([x y z] [(f x y z) (g x y z)])
([x y z & args] [(apply f x y z args) (apply g x y z args)])))
([f g h]
(fn
([] [(f) (g) (h)])
([x] [(f x) (g x) (h x)])
([x y] [(f x y) (g x y) (h x y)])
([x y z] [(f x y z) (g x y z) (h x y z)])
([x y z & args] [(apply f x y z args) (apply g x y z args) (apply h x y
z args)])))
(…)
I'm sure there is a reason they are implemented like this but my curiosity
needs to be sated: what is it?
Thank you,
--
Bálint
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