Which of the following type definitions are examples of Monad, or admit law-abiding Monad instances?MaybeString(->) a for any a(,) a for any a[ ]Gen
Question
Solution 1
In Haskell, a Monad is a type that defines a bind operation, >>=, and a return operation, return, satisfying the three monad laws. Let's go through each of the types you've listed:
- Maybe: Yes, Maybe is a Monad. It's defined in the Haskell Prelude like this:
instance Monad Maybe where
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