Often, Either is used to represent, exclusively, a value or a failure, in a
more detailed way than Maybe can. For example, a function like `parse` (
http://hackage.haskell.org/packages/archive/parsec/latest/doc/html/Text-Pars...),
which is part of Parsec, might have a type like:
parse :: [...] s ->
Eitherhttp://hackage.haskell.org/packages/archive/base/4.5.0.0/doc/html/Data-Eithe...
ParseErrorhttp://hackage.haskell.org/packages/archive/parsec/latest/doc/html/Text-Pars...
a
Meaning, parsing will either fail with a Left ParseError, or succeed with a
Right a, where a is whatever type your parser returns.
Hope that helps,
Alvaro
On Wed, Feb 6, 2013 at 9:37 PM, Jacob Thomas
Hello
I'm new to Haskell, and need help with figuring out the Either type... Any example to show how this works?
Jacob
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