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. 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> >