So I recently decided to start learning Clojure. I installed Clojure
box and wrote this little method to compute all possible combinations
of input:
(defn combinations [items]
(if (== (count items) 1)
(flatten items)
(for [frstitems (flatten (first items))
tlitm (combinations (rest items))]
(flatten (list frstitems tlitm)))))
so (combinations [[1 2] [1 2]])
returns
((1 1) (1 2) (2 1) (2 2))
Is there a way I can get rid of the if form? Having the if statement
duplicates what the for loop does when it creates frstitems. I tried
removing the if statement so the function looks like:
(defn combinations [items]
(for [frstitems (flatten (first items))
tlitm (combinations (rest items))]
(flatten (list frstitems tlitm))))
but when I do this the function just returns an empty list. I tried
to figure out why using the REPL but did not discover the problem.
Is what I'm asking possible and if so what would the function look
like? Thank you.
So far Clojure is pretty cool!
Mike
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