I want to know the difference between
-> , >>= and <-
in haskell and how to use them?
1
votes
I'd recommend reading a monad tutorial. E.g. LYAH has a chapter dedicated to that topic. You will find many monad tutorial around the net if you google for them.
– chi
Your question shows zero effort of finding the answer yourself. You'll find the answer in any basic introduction to the language.
– Nikita Volkov
1 Answers
1
votes
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 >>=.
