haskell学习

关于列表小结：头连接使用(常用) x:xs 如: 1:[2,3]

尾连接

++ 连接符 [1] ++ [1, 3] [1, 1, 3]

无尽函数 [1..]

take 12 [1..] takeWhile (<12) [1..]

应用

定义反转列表

reverse' :: [a] -> [a]
reverse' [] = []
reverse' (x:xs) = reverse' xs ++ [x]

取数后反转列表


(reverse' takeWhile (<12) [1..])