Finding out at what part of a monadic computation the return of a function put a None when there should have been a Some is much more tricky.
This is where Either comes in handy. Either allows you to attach extra information to the error condition (such as a String). This lets you have the same properties of Maybe but with more information when you need to disambiguate.
This is where Either comes in handy. Either allows you to attach extra information to the error condition (such as a String). This lets you have the same properties of Maybe but with more information when you need to disambiguate.