On Tue, Dec 2, 2025, at 10:32 PM, Dmitry Derepko wrote:
>> On Dec 3, 2025, at 12:03 AM, Larry Garfield <[email protected]> wrote:
>>
>> $filtered = array_filter($arr, is Point(x: <10));
>
> Btw, it looks incorrect and short closure is preferable here
> array_filter($arr, fn($x) => $x is Point())
As I said, that's not actually a syntax I'm proposing. Just spitballing that
it would be nice to be able to remove the `fn($x) => $x` boilerplate at some
point. But that's not for this RFC; for now, the fact that you can wrap a
pattern up into a short closure is sufficient for reuse.
> Or if it works with DFA
> array_filter($arr, ? is Point())
>
> If your example illustrated a pattern as an argument I think it’s not
> valid case, because a pattern is something after “is”? The point,
> enumerated types or values. And “is” here is an
> action/function/intention to match left and right operands.
>
> But kotlin style is perfectly matched here
>
> array_filter($arr, { $it is Point() })
Ilija would agree with you, and has been arguing for a { $0 + 3 } type syntax
for extra-short closures for a while now. :-) But that's not in scope for the
moment.
--Larry Garfield
