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; P16 Drop every N'th element from a list.
(def a (list "a" "b" "c" "d" "e" "f" "g" "h" "i" "k"))
(func drop-n (lst n)
(drop-n lst n (list) n))
(func drop-n (lst :nil n acc idx)
acc)
(func drop-n (lst :{:any} n acc idx)
(if (eq? 1 idx)
(drop-n (rest lst) n acc n) ; reset n, don't add to acc
(drop-n (rest lst) n (append acc (first lst)) (-- idx))))
(func -- (num) (- num 1))
(print (->string a))
(print (->string (drop-n a 3)))
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