Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:99540
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain me.com designates 17.172.220.114 as permitted sender)
Content-type: text/plain; charset=utf-8
MIME-version: 1.0 (Mac OS X Mail 10.3 \(3273\))
In-reply-to:
 <CADqTB_jDmFZZc3ah=J8F99P77qnuWVgXS5UwXgrbartCp5B+UQ@mail.gmail.com>
Date: Sun, 18 Jun 2017 20:42:27 +0200
Cc: =?utf-8?Q?Bj=C3=B6rn_Larsson?= <bjorn.x.larsson@telia.com>,
 Fleshgrinder <php@fleshgrinder.com>, PHP internals <internals@lists.php.net>
Content-transfer-encoding: quoted-printable
Message-ID: <3C763609-54FC-480B-AE95-94A1873226E0@me.com>
References:
 <CAFMT4Npoo_ZrRk-kk4C6KHYEtV93pU7Wmh0FhaPi6Z-9qkObaQ@mail.gmail.com>
 <4077c099-2247-c3c1-7dee-02a6b25f8586@fleshgrinder.com>
 <CAObuZdtHXp=icU_aB8dWyjbzW-yZ0sSTW6ObmEsxTuvR679-Fw@mail.gmail.com>
 <CAObuZdvck_w5iEeH5Sz23pDS1T727gtN7pn8XCiPWBvqVWR5Ag@mail.gmail.com>
 <CAObuZdvYX8Yr4KQnzJNeF8CSJVwpxuDevV+6=w_J5J9gx5R8HQ@mail.gmail.com>
 <559b73f7-c40f-e593-f0e1-51b56210d7cb@telia.com>
 <2053A608-6B66-42FB-A6D7-7CC64E94DA6A@koalephant.com>
 <4FBDE643-1EBC-485A-A39F-7E28C5D4807A@koalephant.com>
 <e1c608a0-d046-d3a8-a360-d33c3aa75666@telia.com>
 <034f3ebf-95b8-a7cf-1279-77c7cf0424d7@gmail.com>
 <46143e7c-ef75-7c05-eaa9-98c8f3b405f1@telia.com>
 <CAESVnVrLG4nRrcm7MYAQutb4umLq=FkGo2CWHYqHw+bYo72Bsg@mail.gmail.com>
 <d45a3327-59d4-5c93-1425-70cc2d08a87e@telia.com>
 <CAESVnVpQtLXhKnUn2EE4s7rZn11r5Kpj2zOSOKRCWFaxaeOrjg@mail.gmail.com>
 <b1105f90-91e9-e61a-b96b-5078c337ab5c@telia.com>
 <b47c4379-109c-c289-1077-b42ea40fe19f@telia.com>
 <ca6f11d0-5da3-757c-7acd-4acd79a876f1@fleshgrinder.com>
 <5fe1eefe-1c4f-4c31-c975-ab6c768c977c@telia.com>
 <E56D1F4A-6DC7-47DA-BAD6-1722E017B048@me.com>
 <CADqTB_jDmFZZc3ah=J8F99P77qnuWVgXS5UwXgrbartCp5B+UQ@mail.gmail.com>
To: Rasmus Schultz <rasmus@mindplay.dk>
Subject: Re: [PHP-DEV] [RFC]Discuss] Syntax for Arrow Functions
From: ilija.tovilo@me.com (Ilija Tovilo)

> 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:
>=20
> I don't agree that the fn keyword solves the ambiguity problem - it =
looks
> exactly like a function call.
>=20
> 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.
>=20
>=20
> On Sun, Jun 18, 2017 at 12:58 PM, Ilija Tovilo <ilija.tovilo@me.com> =
wrote:
>=20
>> 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 more but
>> adds a better visual hint to the arrow function.
>>=20
>> 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` =
keyword.
>>=20
>>=20
>>> On 15 Jun 2017, at 17:00, Bj=C3=B6rn Larsson =
<bjorn.x.larsson@telia.com>
>> wrote:
>>>=20
>>> Den 2017-06-15 kl. 15:34, skrev Fleshgrinder:
>>>=20
>>>> 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
>>>>>=20
>>>>> 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?
>>>>>=20
>>>>> r//Bj=C3=B6rn
>>>>>=20
>>>> On Reddit someone proposed the following syntax:
>>>>=20
>>>>    \() =3D> echo 'Hello, World'
>>>>=20
>>>> 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('')`).
>>>>=20
>>>> Not sure if it would still require hacks though.
>>>>=20
>>> 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);
>>>=20
>>> Interesting :)
>>>=20
>>> r//Bj=C3=B6rn
>>>=20
>>> --
>>> PHP Internals - PHP Runtime Development Mailing List
>>> To unsubscribe, visit: http://www.php.net/unsub.php <
>> http://www.php.net/unsub.php>
>>=20