[Haskell-cafe] Why Maybe exists if there is Either?
daniel.trstenjak at gmail.com
Thu Jan 9 15:13:17 UTC 2014
On Thu, Jan 09, 2014 at 03:50:16PM +0100, Vlatko Basic wrote:
> I'm curious to find out what was the reasoning to make Maybe?
> What is the added value with introducing it?
> In which situations the above substitution does not hold?
If you just want to signalize a fail case without any additional
information, then a Maybe fits better than an Either, because
why should you need this bogus empty string?
How should you know that the string doesn't contain something relevant?
More information about the Haskell-Cafe