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Reply-To: Levi Morrison <levi.morrison@datadoghq.com>
Date: Thu, 13 May 2021 08:30:22 -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 7:44 AM Levi Morrison
<levi.morrison@datadoghq.com> wrote:
>
> 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
> > To unsubscribe, visit: https://www.php.net/unsub.php
> >
>
> 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.

I was a bit too hasty. In further review it does do something, but not
what you'd want in situations like this. We are discussing among
authors whether it is technically feasible to support the expected
behavior at this time.