Re: questions about qw<>
> On 13 Oct 2015, at 20:21, Marc Chantreux wrote:
> On Tue, Oct 13, 2015 at 05:59:04PM +0200, Elizabeth Mattijsen wrote:
> an unnamed hash ? does it make sense?
sub h() { my % = a => 42, b => 666 }; dd h
Just another way to create an anonymous hash.
Liz
Re: questions about qw<>
On Tue, Oct 13, 2015 at 05:59:04PM +0200, Elizabeth Mattijsen wrote:
> > designers for having a very good reason and i'm curious: what is actually
> > this good reason for such a weird behave.
>
> Well, for one, it is according to spec. :-)
:)
> But the real reason, is that you can also use to indicate the
> value of a key in a hash:
> my %h = a => 42;
> dd %h;
well .. ok ... i'll deal with it.
> >%< class foo id bar >
>
> That is really a slice on an unnamed hash. So that is ambiguous.
an unnamed hash ? does it make sense?
> >[ ] i missed the good paragraph of the documentation ?
> >[ ] i'm going to do something very stupid ?
> >[ ] other, your answer here
>
> $ 6 'dd %()’
> Hash % = {:a("b"), :c("d")}
> > * i just don't know way i need | in front of % ... it just works but for
> > me %() was enought and explicit on what i wanted to get. can someone
> > explain ?
>
> I guess without the |, you would pass a Hash to br.
i forgot to send the link. it was built with
https://github.com/eiro/p6-Rototo/blob/master/lib/Rototo.pm#L11
> became a list of pairs. Can’t really tell without the br code. But,
> fwiw, I don’t think you need the prefix % at all :-)
i do 'cause of the signature (*%attrs)
thanks for your answer!
cya
--
Marc Chantreux (eiro on github and freenode)
http://eiro.github.com/
http://eiro.github.com/atom.xml
"Don't believe everything you read on the Internet"
-- Abraham Lincoln
Re: questions about qw<>
> On 13 Oct 2015, at 17:15, Marc Chantreux wrote:
>
> hello,
>
> playing with <>, two questions came to my mind:
>
> a) why isn't it "regular" ?
>
>use Test;
>ok < foo bar bang > ~~ List, "a list";
>ok < foo bar > ~~ List, "a list";
>ok < foo > ~~ List, "a list"; diag "actually a Str";
>ok < > ~~ List, "a list";
>
> not only it is an exception to a simple rule but it waste memorizable and
> short
> way to write a 1 element list. as always with perl6, i trust the perl6
> designers for having a very good reason and i'm curious: what is actually
> this good reason for such a weird behave.
Well, for one, it is according to spec. :-)
But the real reason, is that you can also use to indicate the value of a
key in a hash:
my %h = a => 42;
dd %h;
Now, you want that to return a single Int, not a List with one Int in it.
So, that’s why is a Str, and not a List.
> b) shortest way to hash ?
>
> i used %(< class foo id bar >) in my code
>
>https://github.com/eiro/p6-Rototo/blob/master/t/basic.t#L21
>
> i know it sounds stupid but i'm very sorry not being able to write (and most
> of all: read and edit)
>
>%< class foo id bar >
That is really a slice on an unnamed hash. So that is ambiguous.
>
> which isn't allowed ... but perl6 let me cheat: i can define a %
> operator working with an extra space
>
>use v6;
>use Rototo::html;
>
>sub H (*@data) { join '', @data }
>sub prefix:<%> ( List $l ) is tighter(&infix:<,>) { %(|$l) }
>
>say % < id foo class bar >; # class => bar, id => foo
>( % < id foo class bar > ).^name.say; # Hash
>say H br :id, :class; #
>say H br |% < id foo class bar >; #
>say H p |% < id foo class bar >, "this is a good thing”;
># this is a good thing
>
> this is working but raised 2 questions:
>
> * if it was so easy, why isn't it in perl6?
>[ ] i missed the good paragraph of the documentation ?
>[ ] i'm going to do something very stupid ?
>[ ] other, your answer here
$ 6 'dd %()’
Hash % = {:a("b"), :c("d")}
> * i just don't know way i need | in front of % ... it just works but for
> me %() was enought and explicit on what i wanted to get. can someone explain
> ?
I guess without the |, you would pass a Hash to br. With the |, it became a
list of pairs. Can’t really tell without the br code. But, fwiw, I don’t
think you need the prefix % at all :-)
Liz
questions about qw<>
hello,
playing with <>, two questions came to my mind:
a) why isn't it "regular" ?
use Test;
ok < foo bar bang > ~~ List, "a list";
ok < foo bar > ~~ List, "a list";
ok < foo > ~~ List, "a list"; diag "actually a Str";
ok < > ~~ List, "a list";
not only it is an exception to a simple rule but it waste memorizable and short
way to write a 1 element list. as always with perl6, i trust the perl6
designers for having a very good reason and i'm curious: what is actually
this good reason for such a weird behave.
b) shortest way to hash ?
i used %(< class foo id bar >) in my code
https://github.com/eiro/p6-Rototo/blob/master/t/basic.t#L21
i know it sounds stupid but i'm very sorry not being able to write (and most
of all: read and edit)
%< class foo id bar >
which isn't allowed ... but perl6 let me cheat: i can define a %
operator working with an extra space
use v6;
use Rototo::html;
sub H (*@data) { join '', @data }
sub prefix:<%> ( List $l ) is tighter(&infix:<,>) { %(|$l) }
say % < id foo class bar >; # class => bar, id => foo
( % < id foo class bar > ).^name.say; # Hash
say H br :id, :class; #
say H br |% < id foo class bar >; #
say H p |% < id foo class bar >, "this is a good thing";
# this is a good thing
this is working but raised 2 questions:
* if it was so easy, why isn't it in perl6?
[ ] i missed the good paragraph of the documentation ?
[ ] i'm going to do something very stupid ?
[ ] other, your answer here
* i just don't know way i need | in front of % ... it just works but for
me %() was enought and explicit on what i wanted to get. can someone explain ?
regards
--
Marc Chantreux,
Mes coordonnées: http://annuaire.unistra.fr/chercher?n=chantreux
Direction Informatique, Université de Strasbourg (http://unistra.fr)
"Don't believe everything you read on the Internet"
-- Abraham Lincoln
