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Postings from July 2013
On Wed, Jul 3, 2013 at 5:17 PM, David Golden <xdg@xdg.me> wrote:
> On Wed, Jul 3, 2013 at 5:51 PM, D Perrett <perrettdl@googlemail.com> wrote:
>>
>> object methods. Would we be better with a syntax for builtin methods?
>>
>> $arrayRef->>flatten;
>> $hashRef->>flatten;
>
> Rik said "no autoboxing" anyway, but just to complete the thought, I
> think that "methods on references" and "methods on objects" could
> coexist. If a programmer doesn't know whether they have a reference or
> an object, it's up to them to sort it out. Objects should be opaque.
>
> Rather than ->> I'd prefer to just see it done with CORE, if that
> could be made to work, so it's similar to ordinary superclass method
> calling.
>
> $maybe_object->CORE::flatten;
>
> If we had core classes for containers and if references were objects
> this would all be a lot easier, but that ship has probably sailed.
Actually how about ->^
my %h = ( map{ $_, uc $_ } 'a'..'z' );
my $h = \%h;
my @a = ( 'a'..'z' );
my $a = \@a;
say for $h->^keys->^sort;
say for $a->^keys;
say for %h->^keys->^sort;
say for %a->^keys;
package Simple { sub new{bless {}} }
my $obj = Simple->new;
say for $obj->keys; # defers to ->^keys
package Complex {
our @ISA = 'Simple';
sub keys{
my ($self) = @_;
sort keys %$self;
}
}
$obj = Complex->new;
say for $obj->keys; # sorted
say for $obj->^keys; # unsorted
$h->^keys->^sort->^say;
push $a->^@, 1..9;
$a->^push( 1..9 );
my @letters = $a->map(sub{ /\A\w\z/ });
We could even add to ^sort to make it effectively
do a Schwartzian transform for us.
@sorted = @unsorted->^sort(
sub{ $a <=> $b }, # use numeric comparison
sub{ length($_) } # but sort by the length of the string
);
I would like to point out that P6 uses .^ to call methods on
an objects meta object.
Which means that these return the same thing in Perl6:
say @a.^sort;
say @a.HOW;
say @a.HOW.sort;
So this may interfere with using ->^ for meta object
programming.
I think it may still be possible to use it for both
purposes though.
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