$ by itself is a an anonymous state variable.
So these two lines would be exactly the same.
$.foo
(state $).foo
A feature was added where $.foo would instead be used for public attributes.
Since a public attribute just adds a method, it was allowed to use it to
call any method.
Which probably made it simpler to add.
(Note that calling a method on an anonymous variable doesn't make much
sense anyway, so there is no big loss.)
Basically it was made so that these two lines would be the same:
$.foo
$( self.foo() )
Using : on the method was probably just overlooked, because that is not
what that feature is meant for.
On Tue, Nov 19, 2019 at 12:04 AM Raymond Dresens <raymond.dres...@gmail.com>
wrote:
> Hello Vadim, Yary,
>
> Thanks for your feedback,
>
> I've filed an issue: https://github.com/rakudo/rakudo/issues/3306
>
> Yary, about the dollar sign,
>
> The snippet of code in the issue shows that expression "$.attribute"
> inside a method 'just works' for accessing individual attributes (or
> rather: implicitly invoking their accessors?), suggesting [to me] that the
> variable '$' can be used in the context of method lookup on "self". I would
> expect that it would work too when I try to invoke an attribute as a
> method...
>
> ...though solely printing '$' in a method yields "(Any)", not the same as
> printing "self"! Indeed: there's more going on that meets the eye, which
> makes me curious ;) Perhaps the docs mention why, I'll look for that when I
> have the opportunity to do so,
>
> Regards,
>
> Raymond.
>
> On Mon, 18 Nov 2019 at 18:13, Vadim Belman <vr...@lflat.org> wrote:
>
>>
>> I would say filing an issue might make sense in this case. Here is a
>> related comment from Jonathan:
>> https://github.com/rakudo/rakudo/issues/3222#issuecomment-539915286 –
>> and it explicitly states that $. is a shortcut for method calling.
>> Therefore, use of colon instead of braces should be a valid construct.
>>
>> Best regards,
>> Vadim Belman
>>
>> On Nov 18, 2019, at 11:40 AM, yary <not....@gmail.com> wrote:
>>
>> I take that back! What is the dollar sign doing there in the '$.print:
>> ..." example?
>>
>> Try it without the dollar sign. Right now you're calling .print on the
>> anonymous variable '$'
>>
>> -y
>>
>>
>> On Mon, Nov 18, 2019 at 8:38 AM yary <not....@gmail.com> wrote:
>>
>>> looks like a bug to me-file an issue on the rakudo GitHub
>>>
>>> On Sat, Nov 16, 2019 at 5:29 AM Raymond Dresens <
>>> raymond.dres...@gmail.com> wrote:
>>>
>>>> Hello,
>>>>
>>>> I have a question related to the 'colon syntax' of Raku, which allows
>>>> you to call methods without parenthesis like this:
>>>>
>>>> class Foo
>>>> {
>>>> method print($x, $y)
>>>> {
>>>> say "bar: {$x}, {$y}"
>>>> }
>>>> }
>>>>
>>>> my $a = Foo.new;
>>>>
>>>> $a.print: 3, 5; # ...this is what i mean with "colon syntax" ;)
>>>>
>>>> It is possible to use this syntax to call methods on 'self' as well:
>>>>
>>>> class Bar is Foo
>>>> {
>>>> method printDefault
>>>> {
>>>> self.print: 8, 12
>>>> }
>>>> }
>>>>
>>>> my $b = Bar.new;
>>>>
>>>> $b.printDefault;
>>>>
>>>> I use $. rather than 'self' in order to work with attributes inside
>>>> methods in my classes, well, ... mostly, because it does not seem
>>>> possible to do this (in rakudo, at least version 2019.07.1):
>>>>
>>>> class Baz is Foo
>>>> {
>>>> method printDefault
>>>> {
>>>> $.print: 8, 12
>>>> }
>>>> }
>>>>
>>>> This yields a "Confused" error, stating that it expects a so-called
>>>> 'colon pair'.
>>>>
>>>> Is this intentional? Because I'm kind of confused as well about this,
>>>>
>>>> I can live with this 'syntactical quirk', but I just keep wondering
>>>> about it because I'd personally expect that this "$.methodname: $args"
>>>> variant should "just work" as well...
>>>>
>>>> ...so "what gives"? ;)
>>>>
>>>> Thanks for your insights!
>>>>
>>>> Regards,
>>>>
>>>> Raymond.
>>>>
>>> --
>>> -y
>>>
>>
>>
