In Haskell, 'flatMap' is the operation on applicative functors that corresponds to the 'bind' operation on monads. Monads were introduced to Haskell to provide a mechanism for doing effectful programming that restricted the areas of danger around I/O, and the reification of the underlying category theory in which monads are a specialization of applicative functors only came later. Rationalizing all of that would require breaking backwards compatibility of most Haskell code that depends on the standard library. Scala wasn't stuck with this legacy, so they kept the more general term for the operation.
'chain' is a fine name, especially because "monadic promises" work fine in a language with type systems, but the JS version, when / if it comes, is only going to be a distantly rhyming version of a monad, for reasons that we've gone over to death in the past. JS should give names to operations that will actually give people a clue to their purpose. F On Tue, Jan 28, 2014 at 3:48 PM, Brendan Eich <[email protected]> wrote: > Andreas Rossberg wrote: > >> On 29 January 2014 00:30, Brendan Eich<[email protected]> wrote: >> >>> > Andreas Rossberg wrote: >>> >>>> >>> >>>>> >>> `flatMap` >>>>> >>> ... >>>>> >>>> >> >>>> >> >>>> >> The V8 implementation provides it under the name `chain', with the >>>> >> obvious semantics. >>>> >>> > >>> > +1 on chain as name, not flatMap, but Haskell'ers should weigh in. >>> Wait, no. >>> > :-P >>> >> >> Well, Haskell does not have flatMap. Scala has. >> > > What's all this then? > > https://www.google.com/search?q=haskell+flatmap > > /be > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
_______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
