I'm must be missing something obvious for the [s1 s2] case of union:
Is it only that you've measured (conj s1 s2) to be faster when s2 is
the smallest ?
(defn un
....
([s1 s2]
(reduce conj s1 s2))
... )
user=> (def a #{1 2 3})
user=> (def b #{4 5 6 7})
user=> (def A #{:paul :georges :john})
user=> (def B #{:mark :mary})
user=> (un a b)
#{1 2 3 4 5 6 7}
user=> (un b a)
#{1 2 3 4 5 6 7}
user=> (un a B)
#{1 2 3 :mary :mark}
user=> (un B a)
#{1 2 3 :mary :mark}
user=> (un A B)
#{:paul :mary :john :mark :georges}
user=> (un B A)
#{:paul :mary :john :mark :georges}
user=>
???
--
JFB
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