Hey everyone,
I've had to code these guys up a few times:
(defn rotate
"Take a collection and left rotates it n steps. If n is negative,
the
collection is rotated right. Executes in O(n) time."
[n coll]
(let [c (count coll)]
(take c (drop (mod n c) (cycle coll)))))
(defn rotate-while
"Rotates a collection left while (pred item) is true. Will return a
unrotated
sequence if (pred item) is never true. Executes in O(n) time."
[pred coll]
(let [head (drop-while pred coll)]
(take (count coll) (concat head coll))))
Have other people had this problem?
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