是否可以像在Haskell中实现的那样在Scala中实现翻转?
发布时间:2020-12-16 18:41:22 所属栏目:安全 来源:网络整理
导读:是否可以像在 Haskell中实现的那样在 Scala中实现翻转? http://hackage.haskell.org/package/base-4.7.0.1/docs/src/GHC-Base.html#flip flip :: (a - b - c) - b - a - cflip f x y = f y x 解决方法 另一种方式,更接近Haskell版本: scala def flip[a,b,c
是否可以像在
Haskell中实现的那样在
Scala中实现翻转?
http://hackage.haskell.org/package/base-4.7.0.1/docs/src/GHC-Base.html#flip flip :: (a -> b -> c) -> b -> a -> c flip f x y = f y x 解决方法
另一种方式,更接近Haskell版本:
scala> def flip[a,b,c]: (a => b => c) => b => a => c = f => x => y => f(y)(x) flip: [a,c]=> (a => (b => c)) => (b => (a => c)) scala> val f: Int => Char => String = i => c => f"Int($i) and Char($c)" f: Int => (Char => String) = <function1> scala> val g = flip(f) g: Char => (Int => String) = <function1> 或这个: scala> def flip[a,c]: (a => b => c) => b => a => c = { | case f => x => y => f(y)(x) | } flip: [a,c]=> (a => (b => c)) => (b => (a => c)) scala> g('a')(100) res0: String = Int(100) and Char(a) scala> f(100)('a') res1: String = Int(100) and Char(a) (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |