Re: Proposal: add fromRight and fromLeft to Data.Either

There's also (\(Right x)->x), which is pretty short and will give you a warning about the missing case. (I could go either way on adding fromLeft/Right though) Tom

El 20 may 2016, a las 19:22, Francesco Ariis escribió:

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On Fri, May 20, 2016 at 10:08:40PM +0200, Anton Felix Lorenzen wrote: When working with Either, I am often missing two simple functions: fromRight :: Either a b -> b fromLeft :: Either a b -> a

Sometimes my lazy inner-self is guilty of longing for `fromRight` when typing:

λ> either undefined id xyz

but then again, importing Data.Either wouldn't make thing any shorter :P

λ> :m +Da<tab>.Ei<tab> λ> fromRight zyx

I can see fromRight being useful in one-off script; anything bigger than a few lines is asking for trouble!

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