Here is code from core.clj.
The question is when to use when or if.
(defn take
"Returns a lazy seq of the first n items in coll, or all items if
there are fewer than n."
[n coll]
(when (and (pos? n) (seq coll))
(lazy-cons (first coll) (when (> n 1) (take (dec n) (rest
coll))))))
(defn drop
"Returns a lazy seq of all but the first n items in coll."
[n coll]
(if (and (pos? n) (seq coll))
(recur (dec n) (rest coll))
(seq coll)))
-sun
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