[Pdx-pm] Perl 6 Docs and Differences

benh ben.hengst at gmail.com
Fri Oct 3 20:18:18 PDT 2008


the pugscode link is dead for me but I was able to find this:

http://moritz.faui2k3.org/pugs/docs/Perl6/FAQ/Capture.pod.html

On Fri, Oct 3, 2008 at 8:13 PM, Michael G Schwern <schwern at pobox.com> wrote:
> Erik Hollensbe wrote:
>> It seems like ~~ is a more primitive ocaml match/ruby case, where there is the
>> concept of "match equality" (I'm thinking of the file tests and regexes
>> particularly) that may be different from standard equality. Is that correct?
>> Does ~~ provide a direct syntax for multiple possible matches, or is that
>> expected to be provided by the boolean operators, e.g., to test if a file is
>> a directory or a file:
>>
>> $fn ~~ :f | :d # I doubt this is right but I hope this gets the point across
>>
>> or is there something more along the lines of:
>>
>> match $fn
>> with :f
>> with :d
>>
>> which could potentially express the same thing.
>
> Using given/when you'd write that like:
>
>        given $m {
>                when :f | :d {
>                        ...
>                }
>        }
>
> but I'm not entirely sure how the file test operators work.
> See http://perlcabal.org/syn/S03.html#Smart_matching for the full power of ~~.
>
> I do know they're always futzing with ways to eliminate the need for:
>
> if( $foo eq 'bar' or $foo eq 'baz' or $foo eq 'wibble' )
>
>
>> Another curiosity is the change in how code refs are used in method calls.
>> Does this apply to the soft reference special case as well?
>>
>> e.g., perl 5:
>>
>> $foo = "bar";
>>
>> $self->$foo("something"); # calls $self->bar("something");
>
> I suspect it's supposed to, but it's not implemented.
>
> $ ./perl6 -e 'my $foo = "foo";  $foo("bar")'
> invoke() not implemented in class 'Perl6Str'
>
>
>> Also, unless I'm missing something, the whole concept of soft references seems
>> unaddressed. Are these disappearing entirely? While 99% of the time they are
>> something to avoid, the 1% of the time they're handy... they're really handy.
>
> References appear to have been completely replaced by "Capture objects" which
> is news to me.  I'm not going to pretend to know about them, read this.
> http://svn.pugscode.org/pugs/docs/Perl6/FAQ/Capture.pod
>
>
>> Anyways, the progress that's being made and seeing it take shape is a very
>> exciting thing; thanks for linking these documents.
>
> Here is a slightly out of date but more complete set of Perl 6 docs that might
> prove more user friendly.
> http://search.cpan.org/dist/Perl6-Doc/
>
>
> --
> 52. Not allowed to yell "Take that Cobra" at the rifle range.
>    -- The 213 Things Skippy Is No Longer Allowed To Do In The U.S. Army
>           http://skippyslist.com/list/
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-- 
benh~

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