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Date: Fri, 9 Jun 2017 22:00:48 +0200
Message-ID: <CANUQDCg_x8VHbjsm9BjXeC5vOPuasRe7cWWZP3zszRzFiR3HaQ@mail.gmail.com>
To: Sara Golemon <pollita@php.net>
Cc: =?UTF-8?Q?Bj=C3=B6rn_Larsson?= <bjorn.x.larsson@telia.com>, 
	Rowan Collins <rowan.collins@gmail.com>, PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="001a113ac724f7247205518c6cbd"
Subject: Re: [PHP-DEV] [RFC]Discuss] Syntax for Arrow Functions
From: me@kelunik.com (Niklas Keller)

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2017-06-09 15:44 GMT+02:00 Sara Golemon <pollita@php.net>:

> On Fri, Jun 9, 2017 at 7:23 AM, Bj=C3=B6rn Larsson <bjorn.x.larsson@telia=
.com>
> wrote:
> > If I take the liberty in using the example above on our option list:
> > 1. $someDict->map(fn($v) =3D> $v * 2)->filter(fn($v) =3D> $v % 3);
> > 2. $someDict->map(function($v) =3D> $v * 2)->filter(function($v) =3D> $=
v %
> 3);
> > 3. $someDict->map($v =3D=3D> $v * 2)->filter($v =3D=3D> $v % 3);
> > 4. $someDict->map(($v) =3D> $v * 2)->filter(($v) =3D> $v % 3);        /=
/
> > Ambiguous
> > 5. $someDict->map([]($v) =3D> $v * 2)->filter([]($v) =3D> $v % 3);
> >
> > Old proposals:
> > 6. $someDict->map($v ~> $v * 2)->filter($v ~> $v % 3);
> > 7. $someDict->map(lambda($v) =3D> $v * 2)->filter(lambda($v) =3D> $v % =
3);
> >
> Something else which really pops in these examples is the effect of
> not needing to use parentheses when embedding a single-arg short
> lambda.   3 and 6 in your list read cleaner to me (due to the lack of
> parenthesis clutter).  Sadly ~> has the same hacky implementation
> issues as =3D=3D>, but I think that shows a little bit of why the HackLan=
g
> team decided the messy lexer was worth the clearer syntax.


Another possible syntax (dunno whether this has already been suggested
on-list):

$function =3D { $x =3D> 2 * $x };
$function =3D { ($x) =3D> 2 * $x };
$function =3D | $x =3D> 2 * $x |;
$function =3D | ($x) =3D> 2 * $x |;

Nikita and Levi prefer it with parenthesis, I prefer it without, because I
think it's unnecessary clutter.

A reason to use | ... | instead of { ... } would be to allow future object
literals.

Regards, Niklas

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