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Date: Fri, 12 Apr 2019 17:26:45 +0200
Cc: PHP internals <internals@lists.php.net>
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To: Theodore Brown <theodorejb@outlook.com>
Subject: Re: [PHP-DEV] Re: [RFC] Arrow functions / short closures
From: fabacrans@gmail.com (Fabien S)


> On 12 Apr 2019, at 16:46, Theodore Brown <theodorejb@outlook.com> =
wrote:
>=20
> On Thursday, April 11, 2019 at 10:22 AM Fabien S <fabacrans@gmail.com> =
wrote:
>=20
>> I really like the Haskell `\($x)` syntax, could someone confirm if
>> it would possible to drop the parenthesis (like `\$x`) if we have
>> one argument ?
>=20
> The RFC says this syntax is ambiguous without the parentheses, since
> the `\` may also be part of a fully qualified type name. [1]
>=20
> I'm not sure whether it would work if the single parameter isn't =
typed.
>=20
> I like the Haskell syntax as well, but I'd also be okay with the `fn`
> keyword if that's what others prefer.
>=20
> [1]: https://wiki.php.net/rfc/arrow_functions_v2#miscellaneous


Thanks for the clarification, I should have been more specific but I saw =
you used `\$x` in your previous message and I was wondering if this =
syntax is unambiguous.

Basically:

```php
\$x =3D> $x + 1; // One (not typed) argument, no parenthesis needed
\(int $x) =3D> $x + 1; // Typed, parenthesis needed
\($x, $y) =3D> $x + $y; // Multiple arguments, parenthesis needed
```

I don't think it's really important but it would be pretty handy syntax =
in my humble opinion.=