haskell - Haskell 中的二进制映射

Question

Haskell 中是否有一个等价于 map 的双操作数，其类型签名为:

map2 :: (a -> b -> c) -> [a] -> [b] -> [c]

以下等价应成立:

map2 operator as bs === [operator a b | (a, b) <- zip as bs]

示例:

ghci> map2 (*) [2,3] [4,5]
[8,15]

Answer 1

函数zipWith做你需要的。还有 zipWith3 .. zipWith7 用于超过两个列表的情况。