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Reply-To: Levi Morrison <levi.morrison@datadoghq.com>
Date: Thu, 13 May 2021 07:44:40 -0600
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To: someniatko <someniatko@gmail.com>
Cc: Larry Garfield <larry@garfieldtech.com>, php internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] [RFC] Partial function application
From: internals@lists.php.net ("Levi Morrison via internals")

On Thu, May 13, 2021 at 2:45 AM someniatko <someniatko@gmail.com> wrote:
>
> > Greetings, Internalians!
> >
> > I would like to offer for your consideration another RFC, specifically syntax for partial function application.
> >
> > https://wiki.php.net/rfc/partial_function_application
>
> Thank you again for one more wonderful language change! I am sure this
> is a huge step into the correct direction for the language. One of the
> nice side effects of this proposal is that it is great for reducing
> visual clutter when being used in functions like `array_map()`,
> `array_filter()` etc. However, I have a small nitpick, which may
> probably be a bit hard to implement: what about partially applied
> constructors? They are sort of functions as well. For instance:
>
> ```php
> $strings = [ 'value-1', 'value-2' ];
> $objects = array_map(
>     fn (string $s) => new ValueObject($s),
>     $strings
> ```
>
> to be turned into
> ```php
> $strings = [ 'value-1', 'value-2' ];
> $objects = array_map(new ValueObject(?), $strings);
> ```
>
> There is unfortunately no mention of partially applied constructors in
> the RFC. If it is not implemented as above, could you please consider
> adding it to the Future Scope probably?
>
> --
> PHP Internals - PHP Runtime Development Mailing List
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>

The GitHub PR supports this, and there is even a comment there saying
we should show this in the RFC. We'll get that updated.