Re: [RFC]Discuss] Syntax for Arrow Functions

> I don't agree that the fn keyword solves the ambiguity problem - it looks > exactly like a function call. Right. But it does solve the ambiguity if fn is a keyword which is what the RFC suggests. > On 18 Jun 2017, at 18:40, Rasmus Schultz <rasmus@mindplay.dk> wrote: > > I don't agree that the fn keyword solves the ambiguity problem - it looks > exactly like a function call. > > As for the backslash, my honest reaction is, ugh, please, no more > backslashes - PHP (and every other language) uses backslashes for escaping > in strings, it already looks pretty awkward in namespaces, this won't help. > > > On Sun, Jun 18, 2017 at 12:58 PM, Ilija Tovilo <ilija.tovilo@me.com> wrote: > >> The backslash has actually been one of the earlier options if I remember >> correctly. >> I definitely prefer the fn keyword as it’s only one >> character more but >> adds a better visual hint to the arrow function. >> >> I’m also not sure why we’d choose a different arrow >> (==> or ~>) when >> the ambiguity is solved through either a the backslash or the >> fn keyword. >> >> >>> On 15 Jun 2017, at 17:00, Björn Larsson <bjorn.x.larsson@telia.com> >> wrote: >>> >>> Den 2017-06-15 kl. 15:34, skrev Fleshgrinder: >>> >>>> On 6/15/2017 3:29 PM, Björn Larsson wrote: >>>>> Seems like the constraints on this feature makes it hard to fly, i.e. >>>>> 1. Not a hackish implementation >>>>> 2. Non ambiguous syntax >>>>> 3. Easy to parse & use syntax for the human >>>>> >>>>> HackLang then prioritised 2 & 3 making the end-users happy, but >>>>> had to sacrifise a clean implementation. Any clue if this was a one- >>>>> time effort once it was done or something with a lot of drawbacks >>>>> in terms of maintenance, performance, evolution etc? >>>>> >>>>> r//Björn >>>>> >>>> On Reddit someone proposed the following syntax: >>>> >>>> \() => echo 'Hello, World' >>>> >>>> It is used by Haskell if I remember correctly and should not be >>>> ambiguous since ( is not allowed in names of >>>> classes or functions. It >>>> actually aligns well with functions that are called with a >>>> fully-qualified name (e.g. \printf('')). >>>> >>>> Not sure if it would still require hacks though. >>>> >>> So applying that one on Sara's example becomes with some >>> options for the arrow: >>> 8. $someDict->map(\($v) => $v * 2)->filter(\($v) => $v % 3); >>> 9. $someDict->map(\($v) ==> $v * 2)->filter(\($v) ==> $v % 3); >>> 10. $someDict->map(\($v) ~> $v * 2)->filter(\($v) ~> $v % 3); >>> >>> Interesting :) >>> >>> r//Björn >>> >>> -- >>> PHP Internals - PHP Runtime Development Mailing List >>> To unsubscribe, visit: http://www.php.net/unsub.php >>> < >> http://www.php.net/unsub.php> >>