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Date: Sun, 18 Jun 2017 18:40:48 +0200
Message-ID: <CADqTB_jDmFZZc3ah=J8F99P77qnuWVgXS5UwXgrbartCp5B+UQ@mail.gmail.com>
To: Ilija Tovilo <ilija.tovilo@me.com>
Cc: =?UTF-8?Q?Bj=C3=B6rn_Larsson?= <bjorn.x.larsson@telia.com>, 
	Fleshgrinder <php@fleshgrinder.com>, PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] [RFC]Discuss] Syntax for Arrow Functions
From: rasmus@mindplay.dk (Rasmus Schultz)

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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=E2=80=99s only one character m=
ore but
> adds a better visual hint to the arrow function.
>
> I=E2=80=99m also not sure why we=E2=80=99d choose a different arrow (`=3D=
=3D>` or `~>`) when
> the ambiguity is solved through either a the backslash or the `fn` keywor=
d.
>
>
> > On 15 Jun 2017, at 17:00, Bj=C3=B6rn Larsson <bjorn.x.larsson@telia.com=
>
> wrote:
> >
> > Den 2017-06-15 kl. 15:34, skrev Fleshgrinder:
> >
> >> On 6/15/2017 3:29 PM, Bj=C3=B6rn 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//Bj=C3=B6rn
> >>>
> >> On Reddit someone proposed the following syntax:
> >>
> >>     \() =3D> 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. I=
t
> >> 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) =3D> $v * 2)->filter(\($v) =3D> $v % 3);
> > 9. $someDict->map(\($v) =3D=3D> $v * 2)->filter(\($v) =3D=3D> $v % 3);
> > 10. $someDict->map(\($v) ~> $v * 2)->filter(\($v) ~> $v % 3);
> >
> > Interesting :)
> >
> > r//Bj=C3=B6rn
> >
> > --
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