本文介绍了如何在haskell中使用箭头运算符的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想知道
$ b
< - 是 do 中的语法糖,块,其中 do {a< - b; c} 翻译为 b>>> = \ a - > c ,即它基本上是编写>> = 的更好方法。
I want to know the difference between
-> , >>= and <-
in haskell and how to use them?
解决方案
a -> b is the function type. It describes a function that takes a type a and returns a type b.
>>= is the monadic bind function. It is of type Monad m => m a -> (a -> m b) -> m b. If you need to understand this, I recommend reading Learn You a Haskell for Great Good.
<- is syntactic sugar in a do block, where do {a <- b; c} translates as b >>= \a -> c, i.e, it's basically a nicer way of writing >>=.
这篇关于如何在haskell中使用箭头运算符的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!