It's available in MissingH: http://hackage.haskell.org/packages/archive/MissingH/latest/doc/html/Data-Either-Utils.html#v:maybeToEither
You can find this using Hayoo, which indexes Hackage. MissingH is pretty huge, though, just for one function. It's kind of annoying. I'm using this function in my library and one other, in the hopes I'll need more to make depending on MissingH worth it. On 2 August 2010 16:14, Tom Davies <tgdav...@gmail.com> wrote: > I find it convenient sometimes to convert a Maybe value to an Either thus > (excuse the syntax, it's CAL, not Haskell): > > maybeToEither :: a -> Maybe b -> Either a b; > maybeToEither errorValue = maybe (Left errorValue) (\x -> Right x); > > but that seemingly obvious function isn't in Hoogle, AFAICT, so perhaps > there's some other approach? > > Thanks, > Tom_______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
