I'm not sure how Alternative differs from MonadPlus, other than being defined for Applicative rather than Monad. They have the same laws (identity and associativity).
"Some" and "many" are probably motivated by their usefulness in parsers. Hence "optional", etc. I'm sure there are plenty of other uses for it. On 23 June 2010 05:22, Gregory Crosswhite <gcr...@phys.washington.edu> wrote: > Hey everyone, > > Could someone explain to me (or point me to a reference explaining) the > purpose of the "some" and "many" methods of the Alternative class? > > Also, there is a link posted in the documentation for Control.Applicative to > a paper which describes the motivation behind the Applicative class; is > there similarly a paper explaining the motivation behind the Alternative > class? (The problem with Googling for "Alternative" is that this word is > used a whole lot of the time, and very rarely does it refer to the > Alernative class. :-) ) > > Cheers, > Greg > > _______________________________________________ > 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
