On Mon, Jan 23, 2023 at 6:31 PM Larry Garfield <la...@garfieldtech.com> wrote: > > On Mon, Jan 23, 2023, at 10:53 AM, Ollie Read wrote: > > There's definitely similarity, but I would say it sits somewhere > > between the two. Rather than reference a partial method call, or create > > a closure for a method, you're delaying a method call. Or rather, > > referencing a method. We have the ::class pseudo property, so I see > > this like an equivalent, but for methods. > > So what you're really looking for is a shorter way to write this: > > foo(fn(Str $s) => $s->beep()); > > Now you're definitely in the realm of PFA, pipes, and that kind of > functionality. And, sadly, Internals has shown a great deal of resistance to > that kind of functionality. I have a user-space implementation of pipes that > includes utilities to do something similar[1], but most functional languages > I know also don't have a really strong native way to "turn around" a call > like that. > > I'd love a solution for that, but so far it has proven both elusive and > controversial. > > --Larry Garfield > > [1] https://github.com/Crell/fp/blob/master/src/object.php#L28 > > -- > PHP Internals - PHP Runtime Development Mailing List > To unsubscribe, visit: https://www.php.net/unsub.php >
Speaking of partial application, it'd be amazing if it were available with the current closure syntax: $func = fn($x, $y, $z) => echo $x + $y + $z; $plus1 = $func(..., 1); $plus2n1 = $func(2, 1, ...); $a = $plus1(1, 2); $b = $plus2n1(5); I spent a few days last summer trying this out, but couldn't get the grammar parser to accept it. I think I have a local branch if someone would be willing to work on it with me. At least point me in the right direction. I don't have much free time these days, but it is certainly doable. Robert Landers Software Engineer Utrecht NL -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: https://www.php.net/unsub.php
