On Feb 28, 2:54 am, logan <duskli...@gmail.com> wrote:
> Let's say I want to write a function that takes as an argument a list
> of n numbers, and returns 4 lists, a list of odd numbers that are
> multiples of 5, a list of even numbers that are multiples of 5, a list
> of odd numbers that are not multiples of 5, and a list of even numbers
> that are not multiples of 5. (...)
I don't know if more efficient solutions exist, but you could use
clojure.contrib.seq-utils/group-by (which is implemented using
reduce).
user> (group-by (juxt odd? #(zero? (mod % 5))) (range 20))
{[false false] [2 4 6 8 12 14 16 18], [false true] [0 10],
[true false] [1 3 7 9 11 13 17 19], [true true] [5 15]}
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