I was wondering if scala Either
is really a Monad
in Category Theory sense?. I know that Monads should have bind
and return
methods. What is Either
's bind
then?
Is Scala Either really a Monad
1.8k Views Asked by goral At
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Yes, it really is - otherwise it would be in scalaz-outlaws.
Either
'sbind
is defined something like:(in practice it's defined via a typeclass, but the above definition would work)
I guess it's more proper to say that for a fixed
A
, the type({type L[B]=Either[A, B]})#L
forms aMonad
, soEither
is more a class ofMonads
than aMonad
in its own right, but that's an exceedingly technical distinction.But it really is a
Monad
; it satisfies all the monad laws.