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Haskell Zipper 二叉树 记录方向 二元树 data Tree a = Empty | Node a (Tree a) (Tree a) 改变节点值 data Direction = L | R change :: [Direction] -> Tree Char -> Tree Cha 阅读全文
posted @ 2025-05-08 23:53
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摘要:
函子 应用函子 单子 定义 Functor class Functor f where fmap :: (a -> b) -> f a -> f b fmap id == id -- 恒等律 fmap (f . g) == fmap f . fmap g -- 组合律 Applicative cla 阅读全文
posted @ 2025-05-08 16:25
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