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Date: Fri, 9 Jun 2017 09:44:16 -0400
Message-ID: <CAESVnVpQtLXhKnUn2EE4s7rZn11r5Kpj2zOSOKRCWFaxaeOrjg@mail.gmail.com>
To: =?UTF-8?Q?Bj=C3=B6rn_Larsson?= <bjorn.x.larsson@telia.com>
Cc: Rowan Collins <rowan.collins@gmail.com>, PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] [RFC]Discuss] Syntax for Arrow Functions
From: pollita@php.net (Sara Golemon)

On Fri, Jun 9, 2017 at 7:23 AM, Bj=C3=B6rn Larsson <bjorn.x.larsson@telia.c=
om> 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 HackLang
team decided the messy lexer was worth the clearer syntax.

-Sara