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Date: Thu, 04 Aug 2011 11:03:16 +0200
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To: Rasmus Lerdorf <rasmus@lerdorf.com>
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Subject: Re: [PHP-DEV] An implementation of a short syntax for closures
From: ivan.enderlin@hoa-project.net ("Ivan Enderlin @ Hoa")

Hi all :-),

On 04/08/11 09:23, Rasmus Lerdorf wrote:
> On 08/04/2011 12:08 AM, Lazare Inepologlou wrote:
>> $add =3D | $x |=3D>  | $y : $x |=3D>  $x+$y;
> This does not seem to match the syntax of any language I know of so
> people are going to have a hard time figuring out what this does. It's
> not even clear that |=3D>  is a new operator there due to the dangling =
|,
> which as you say conflicts with the regular | operator. Plus it is only=

> useful in one limited type of trivial closure usage.
This syntax reminds me the =E2=80=9Cblock lambda syntax=E2=80=9D, present=
ed on the=20
ECMAScript's wiki [1] about the future of ECMAScript6. It seems they=20
tend to choose the =E2=80=9Carrow function syntax=E2=80=9D [2], which is =
more natural=20
and more readable. You can found pros and cons on the wiki, along with a =

lot of use cases/examples (including rebinding this!).

For a quicker introduction to these two short syntaxes, I would suggest=20
you to read the conference =E2=80=9CFalsyValues=E2=80=9D [3], from slide =
31 to 36,=20
recently given by Dmitry Soshnikov about the future of ECMAScript 6 (all =

the conference is a beauty, a must-read).

> In PHP we try really hard not to invent new unfamiliar syntax. We try t=
o
> stick with things that have some basis in either the existing syntax or=

> in other popular languages that the average PHP developer might be
> exposed to.
+1. It must be the result of a long reflection and we should get a large =

vote from the community before choosen one syntax.


Best regards.


[1] <http://wiki.ecmascript.org/doku.php?id=3Dstrawman:block_lambda_reviv=
al>
[2] <http://wiki.ecmascript.org/doku.php?id=3Dstrawman:arrow_function_syn=
tax>
[3]=20
<http://www.slideshare.net/dmitrysoshnikov/falsyvalues-dmitry-soshnikov-e=
cmascript-6>

--=20
Ivan Enderlin
Developer of Hoa Framework
http://hoa.42/ or http://hoa-project.net/

Member of HTML and WebApps Working Group of W3C
http://w3.org/