Re: Re: [RFC][Discuss] Arrow Functions

Hi Levi, On Sat, Feb 4, 2017 at 2:53 AM, Levi Morrison <levim@php.net> wrote: > One more thing: I'd like to re-emphasize that the syntax that > JavaScript uses and the one that HHVM/Hack uses are ambiguous in the > current class of our grammar. The following will not work unless we > move to a more powerful grammar and parser class: > > (params) => expr > (params) ==> expr > > This is why an un-ambiguous prefix is necessary: the prefix breaks the > ambiguities. The syntax I have suggested in the RFC and the one I > suggested just now are not ambiguous because distinct prefixes: > Thanks for explanation. > an un-ambiguous prefix is necessary This is what I guessed. This should be emphasized and everyone should understand. Otherwise, discussion goes nowhere. > fn(params) => expr > |params| => expr > > I look forward to more discussion! > It's unfortunate we cannot have HHVM/Hack syntax now https://docs.hhvm.com/hack/lambdas/introduction but both fn(params) => expr |params| => expr would be good enough for now. I don't see much problem with |(int | float) params| => expr It's better to be compatible with other implementations if it is possible. PHP may have HHVM/Hack syntax support in the future. Regards, -- Yasuo Ohgaki yohgaki@ohgaki.net