Hi Richard, it doesn't appear to be a REPL-only result:
user@mbook:~$ cat richard_closure.p6
class A { has &.f = -> { 'xyz' }};
my A $a .=new;
say $a.f();
say $a.f.();
user@mbook:~$ raku richard_closure.p6
-> { #`(Block|140238954644472) ... }
xyz
user@mbook:~$ raku --version
Welcome to 𝐑𝐚𝐤𝐮𝐝𝐨™ v2020.10.
Implementing the 𝐑𝐚𝐤𝐮™ programming language v6.d.
Built on MoarVM version 2020.10.
I took a brief glance at the StackOverflow post referred to elsewhere
in this thread, but it's unclear to me how the two issues are related.
I understood the results in the SO post to be a consequence of
declaring private methods. Further study on my part is needed.
HTH, Bill.
On Sun, Jan 3, 2021 at 10:30 AM Richard Hainsworth
<rnhainswo...@gmail.com> wrote:
>
> I was playing with classes and adding a closure to an attribute.
>
> I discovered that to call a closure on object I need `.()` rather than just
> `()`. See REPL below.
>
> raku
> Welcome to 𝐑𝐚𝐤𝐮𝐝𝐨™ v2020.12.
> Implementing the 𝐑𝐚𝐤𝐮™ programming language v6.d.
> Built on MoarVM version 2020.12.
>
> To exit type 'exit' or '^D'
> > class A { has &.f = -> { 'xyz' }}
> (A)
> > my A $a .=new
> A.new(f => -> { #`(Block|94272504746848) ... })
> > say $a.f()
> -> { #`(Block|94272504749656) ... }
> > say $a.f.()
> xyz
> >
>
>
> I was wondering whether it was intended for `()` to return something other
> than `.()`?
>
> My first thought would be that `.()` would have the same syntactic sugar as
> `.[]` on an Array object.
>
> I looked in the Documentation and in Classes found
>
> &!callback();
> inside class Task.
>
> So I think there may be something a bit wrong. Or is this an artifact of REPL?
