On Sat, 19 Dec 2020, 02:48 Larry Garfield, <la...@garfieldtech.com> wrote:
> On Fri, Dec 18, 2020, at 1:40 PM, Olle Härstedt wrote:
> > What about matching on a variable's type?
> >
> > ```
> > match {
> > $var: string => "is a string"
> > $var: array => "something else"
> > }
> > ```
> >
> > This could be used with flow-sensitive typing, e.g. assume the type of
> $var
> > being string in the string block. Psalm works like this for
> if-statements.
> > Also consider the case with generics.
> >
> > Compare with generalised algebraic data types in FP (GADT).
> >
> > Olle
>
> That would be more along the lines of the pattern matching RFC that Ilija
> and I have been kicking around for post-enums:
> https://wiki.php.net/rfc/pattern-matching
>
> That's still in the "it would be cool if" stage only, and is IMO off topic
> from the abbreviation effort in this RFC.
>
> --Larry Garfield
>
Very cool. Thanks for the link. Looking forward to further implementations!
Olle
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