4clojure 题解 Split a sequence

根据参数切割一个序列，不允许使用split-at

Write a function which will split a sequence into two parts.

	(= (__ 3 [1 2 3 4 5 6]) [[1 2 3] [4 5 6]])
	(= (__ 1 [:a :b :c :d]) [[:a] [:b :c :d]])
	(= (__ 2 [[1 2] [3 4] [5 6]]) [[[1 2] [3 4]] [[5 6]]])

解答

(fn [n coll]
   [(take n coll) (drop n coll)]
   )

take操作取得序列前n项目

drop 操作序列除了前n项之后的剩余部分