我试着将出现在彼此旁边的项目分组,只要它们都在给定的“白名单”中分组必须至少包含两个或多个项。
例如,第一个参数是集合,第二个参数是白名单。
(group-sequential [1 2 3 4 5] [2 3])
>> ((2 3))
(group-sequential ["The" "quick" "brown" "healthy" "fox" "jumped" "over" "the" "fence"]
["quick" "brown" "over" "fox" "jumped"])
>> (("quick" "brown") ("fox" "jumped" "over"))
(group-sequential [1 2 3 4 5 6 7] [2 3 6])
>> ((2 3))
这就是我想出来的:
(defn group-sequential
[haystack needles]
(loop [l haystack acc '()]
(let [[curr more] (split-with #(some #{%} needles) l)]
(if (< (count curr) 2)
(if (empty? more) acc (recur (rest more) acc))
(recur (rest more) (cons curr acc))))))
它能工作,但很难看。我想知道在clojure中是否有一种更简单的习惯用法?(你应该在我发现和…分手之前看到fn)
我敢打赌有一个很好的分隔线或什么的,但它晚了,我似乎无法使它工作。
最佳答案
(defn group-sequential [coll white]
(->> coll
(map (set white))
(partition-by nil?)
(filter (comp first next))))
是啊。更整洁的Diego Basch's method版本。