[Rio-pm] [Golf] Função drop Haskell

Quarta Fevereiro 3 13:03:16 PST 2010

Mas o array não vem como referencia?

Just another Perl Hacker,
Fernando (SmokeMachine)
http://perl-e.org
Sent from Rio De Janeiro, RJ, Brazil

Em 3 de fevereiro de 2010 19:00, Blabos de Blebe <blabos em gmail.com>escreveu:

> Sacanagem...
>
> sub drop{($a, em b)=@_;$a=0if$a<0;@b>1?@b[$a..$#b]:substr$b[0],$a}
>
>
>
> 2010/2/3 Fernando Oliveira <fernandocorrea em gmail.com>:
> > 64:
> >
> > sub drop{($a,$b)=@_;$a=0if$a<0;ref$b?@$b[$a..$#$b]:substr$b,$a}
> >
> > Just another Perl Hacker,
> > Fernando (SmokeMachine)
> > http://perl-e.org
> > Sent from Rio De Janeiro, RJ, Brazil
> >
> >
> > Em 3 de fevereiro de 2010 18:33, Nilson Santos Figueiredo Jr.
> > <acid06 em gmail.com> escreveu:
> >>
> >> Eu tenho certeza que vai dar pra alguém melhorar, ainda tá grande.
> >> Mas se eu ficar mais tempo aqui tentando... vou ter meus dias inteiros
> >> pra ficar brincando de Golf ao invés de ter um trabalho. ;-)
> >>
> >> -Nilson
> >>
> >> 2010/2/3 breno <breno em rio.pm.org>:
> >> > Nilson, o final deveria dizer "mas é igual à versão do Nilson". Como
> >> > eu fiz um monte de edições e contagens, acabou q foi enviado sem e eu
> >> > nao percebi. O crédito e a menor tacada ainda são seus :-)
> >> >
> >> > []s
> >> >
> >> > -b
> >> >
> >> > 2010/2/3 Nilson Santos Figueiredo Jr. <acid06 em gmail.com>:
> >> >> Breno,
> >> >>
> >> >> Essa que você mandou é exatamente igual a minha anterior, mas ao
> invés
> >> >> de $a,$b eu uso $n,$w.
> >> >> Tem 65 chars fora e 55 dentro. Eu estava contando tudo.
> >> >>
> >> >> Mas essa tem um problema que retorna undef em alguns casos. Aí o
> >> >> Mantovani que tem que falar se é certo ou não.
> >> >>
> >> >> -Nilson
> >> >>
> >> >> 2010/2/3 breno <breno em rio.pm.org>:
> >> >>> fernando, nao pode funcionar pra valores negativos, vai entender :-)
> >> >>>
> >> >>> acredito que assim funcione:
> >> >>>
> >> >>> sub drop{($a,$b)=@_;$a=0if$a<0;ref$b?@$b[$a..$#{$b}]:substr$b,$a}
> >> >>>
> >> >>> 55 chars (dentro da sub).
> >> >>>
> >> >>>
> >> >>>
> >> >>> 2010/2/3 Fernando Oliveira <fernandocorrea em gmail.com>:
> >> >>>> 54:
> >> >>>>
> >> >>>> sub drop{($a,$b)=@_;ref$b?@$b[$a..$#{$b}]:substr$b,$a}
> >> >>>>
> >> >>>> Just another Perl Hacker,
> >> >>>> Fernando (SmokeMachine)
> >> >>>> http://perl-e.org
> >> >>>>
> >> >>>>
> >> >>>>
> >> >>>> Em 3 de fevereiro de 2010 17:54, Nilson Santos Figueiredo Jr.
> >> >>>> <acid06 em gmail.com> escreveu:
> >> >>>>>
> >> >>>>> Pronto, 80 caracteres (sem strict).
> >> >>>>> Estou satisfeito, agora é com vocês:
> >> >>>>>
> >> >>>>> sub
> >> >>>>>
> >> >>>>>
> drop{($n,$w)=@_;$n=0if$n<0;ref$w?@$w[$n..$#{$w}]:$n>length$w?'':substr$w,$n}
> >> >>>>>
> >> >>>>> -Nilson
> >> >>>>>
> >> >>>>> 2010/2/3 Nilson Santos Figueiredo Jr. <acid06 em gmail.com>:
> >> >>>>> > Melhorando a minha solução anterior, 85 caracteres (83 tirando o
> >> >>>>> > my):
> >> >>>>> >
> >> >>>>> > sub drop{my($n,$w)=@_;$n=0
> >> >>>>> > if$n<0;ref$w?@$w[$n..$#{$w}]:$n>length$w?'':substr($w,$n)}
> >> >>>>> >
> >> >>>>> > -Nilson
> >> >>>>> >
> >> >>>>> > 2010/2/3 Nilson Santos Figueiredo Jr. <acid06 em gmail.com>:
> >> >>>>> >> Uma solução, warnings and strict compliant:
> >> >>>>> >>
> >> >>>>> >> sub drop {
> >> >>>>> >>    my ($n, $w) = @_;
> >> >>>>> >>    $n = 0 if $n < 0;
> >> >>>>> >>    return ( $n > length $w ? '' : substr($w,$n) ) if !ref $w;
> >> >>>>> >>    @$w[$n..$#{$w}];
> >> >>>>> >> }
> >> >>>>> >>
> >> >>>>> >> Se colocar tudo em uma linha:
> >> >>>>> >>
> >> >>>>> >> sub drop{my($n,$w)=@_;$n=0
> >> >>>>> >>
> >> >>>>> >> if$n<0;return($n>length$w?'':substr($w,$n))if!ref$w;@
> $w[$n..$#{$w}];}
> >> >>>>> >>
> >> >>>>> >> 96 caracteres. Deve dar pra melhorar bastante ainda. Se tirar o
> >> >>>>> >> "my"
> >> >>>>> >> pra deixar de ser strict compliant, cai pra 94.
> >> >>>>> >>
> >> >>>>> >> -Nilson
> >> >>>>> >>
> >> >>>>> >> 2010/2/3 Daniel de Oliveira Mantovani
> >> >>>>> >> <daniel.oliveira.mantovani em gmail.com>:
> >> >>>>> >>> Olá pessoal, o desafio envolve a função drop do Haskell:
> >> >>>>> >>>
> >> >>>>> >>> <haskell>
> >> >>>>> >>> ghci> myDrop 2 "foobar"
> >> >>>>> >>> "obar"
> >> >>>>> >>> ghci> myDrop 4 "foobar"
> >> >>>>> >>> "ar"
> >> >>>>> >>> ghci> myDrop 4 [1,2]
> >> >>>>> >>> []
> >> >>>>> >>> ghci> myDrop 0 [1,2]
> >> >>>>> >>> [1,2]
> >> >>>>> >>> ghci> myDrop 7 []
> >> >>>>> >>> []
> >> >>>>> >>> ghci> myDrop (-2) "foo"
> >> >>>>> >>> "foo"
> >> >>>>> >>> </haskell>
> >> >>>>> >>>
> >> >>>>> >>> Eu fiz em Perl, para ficar claro:
> >> >>>>> >>>
> >> >>>>> >>> <perl>
> >> >>>>> >>> sub drop {
> >> >>>>> >>>    my ( $n, $xs ) = @_;
> >> >>>>> >>>    if ( ref $_[1] ne 'ARRAY' ) {
> >> >>>>> >>>        $n <= 0 ? return $_[1] : return substr( $_[1], $n );
> >> >>>>> >>>    }
> >> >>>>> >>>    if ( $n <= 0 || !@_ ) {
> >> >>>>> >>>        return @{$xs};
> >> >>>>> >>>    }
> >> >>>>> >>>    else {
> >> >>>>> >>>        shift @{$xs};
> >> >>>>> >>>        drop( ( $n - 1 ), $xs );
> >> >>>>> >>>    }
> >> >>>>> >>> }
> >> >>>>> >>> </perl>
> >> >>>>> >>>
> >> >>>>> >>> Exemplos:
> >> >>>>> >>> mantovani em mantovani-desktop:~/Perl/Funcional$ perl -MHaskell
> -E
> >> >>>>> >>> 'say
> >> >>>>> >>> $_ for drop(3,[1,2,3,4,5,6])'
> >> >>>>> >>> 4
> >> >>>>> >>> 5
> >> >>>>> >>> 6
> >> >>>>> >>>
> >> >>>>> >>> mantovani em mantovani-desktop:~/Perl/Funcional$ perl -MHaskell
> -E
> >> >>>>> >>> 'say
> >> >>>>> >>> $_ for drop(1,"ofernandoagoragolf")'
> >> >>>>> >>> fernandoagoragolf
> >> >>>>> >>>
> >> >>>>> >>> mantovani em mantovani-desktop:~/Perl/Funcional$ perl -MHaskell
> -E
> >> >>>>> >>> 'say
> >> >>>>> >>> $_ for drop(2,["mantovani","garu","fernando","blabos"])'
> >> >>>>> >>> fernando
> >> >>>>> >>> blabos
> >> >>>>> >>>
> >> >>>>> >>> mantovani em mantovani-desktop:~/Perl/Funcional$ perl -MHaskell
> -E
> >> >>>>> >>> 'say
> >> >>>>> >>> $_ for drop(-1,["mantovani","garu","fernando","blabos"])'
> >> >>>>> >>> mantovani
> >> >>>>> >>> garu
> >> >>>>> >>> fernando
> >> >>>>> >>> blabos
> >> >>>>> >>>
> >> >>>>> >>> mantovani em mantovani-desktop:~/Perl/Funcional$ perl -MHaskell
> -E
> >> >>>>> >>> 'say
> >> >>>>> >>> $_ for drop(-1,"mantovani")'
> >> >>>>> >>> mantovani
> >> >>>>> >>>
> >> >>>>> >>> mantovani em mantovani-desktop:~/Perl/Funcional$ perl -MHaskell
> -E
> >> >>>>> >>> 'say
> >> >>>>> >>> $_ for drop(10,"mantovani")'
> >> >>>>> >>>
> >> >>>>> >>> --
> >> >>>>> >>> "If you’ve never written anything thoughtful, then you’ve
> never
> >> >>>>> >>> had
> >> >>>>> >>> any difficult, important, or interesting thoughts. That’s the
> >> >>>>> >>> secret:
> >> >>>>> >>> people who don’t write, are people who don’t think."
> >> >>>>> >>> _______________________________________________
> >> >>>>> >>> Rio-pm mailing list
> >> >>>>> >>> Rio-pm em pm.org
> >> >>>>> >>> http://mail.pm.org/mailman/listinfo/rio-pm
> >> >>>>> >>>
> >> >>>>> >>
> >> >>>>> >
> >> >>>>> _______________________________________________
> >> >>>>> Rio-pm mailing list
> >> >>>>> Rio-pm em pm.org
> >> >>>>> http://mail.pm.org/mailman/listinfo/rio-pm
> >> >>>>
> >> >>>>
> >> >>>> _______________________________________________
> >> >>>> Rio-pm mailing list
> >> >>>> Rio-pm em pm.org
> >> >>>> http://mail.pm.org/mailman/listinfo/rio-pm
> >> >>>>
> >> >>> _______________________________________________
> >> >>> Rio-pm mailing list
> >> >>> Rio-pm em pm.org
> >> >>> http://mail.pm.org/mailman/listinfo/rio-pm
> >> >>>
> >> >> _______________________________________________
> >> >> Rio-pm mailing list
> >> >> Rio-pm em pm.org
> >> >> http://mail.pm.org/mailman/listinfo/rio-pm
> >> >>
> >> > _______________________________________________
> >> > Rio-pm mailing list
> >> > Rio-pm em pm.org
> >> > http://mail.pm.org/mailman/listinfo/rio-pm
> >> >
> >> _______________________________________________
> >> Rio-pm mailing list
> >> Rio-pm em pm.org
> >> http://mail.pm.org/mailman/listinfo/rio-pm
> >
> >
> > _______________________________________________
> > Rio-pm mailing list
> > Rio-pm em pm.org
> > http://mail.pm.org/mailman/listinfo/rio-pm
> >
> _______________________________________________
> Rio-pm mailing list
> Rio-pm em pm.org
> http://mail.pm.org/mailman/listinfo/rio-pm
>
-------------- Próxima Parte ----------
Um anexo em HTML foi limpo...
URL: <http://mail.pm.org/pipermail/rio-pm/attachments/20100203/52a2a20e/attachment-0001.html>