What you want is `%items{$item}."$attr"()`. But if all you want is removing the show's repetition, maybe there are other ways, for example:
for %!items<ropa femur fósforos>:kv { say $^key.tc, ' ', $^value.amount; } or if you want all items: for %!items { say .key.tc, ' ', .value.amount; } On 2017-12-30 05:13:43 GMT, clasclin . wrote: > I'm reading a book "Make your own python text adventure" and decided to > give it a try with perl6. So this code works as expected. > > class Bag { > has %.items; > > method show { > say "ropa ", %!items<ropa>.amount > if %!items<ropa>:exists; > say "femur ", %!items<femur>.amount > if %!items<femur>:exists; > say "fósforos ", %!items<fósforos>.amount > if %!items<fósforos>:exists; > } > } > > I'm using a class called bag as my inventory and trying to keep track of > items in a hash, so the key is just a name and the value is an object and > just found that a pattern when I try to list the elements on the screen... > > dd %!items > Hash %!items = {:femur(Items::Femur.new(amount => 1)), > :fósforos(Items::Matches.new(amount => 3)), :ropa(Items::Cloth.new(amount > => 4))} > > Items has data and the show method does what I expect, then I change the > code, so I try to add a private method that handdle the pattern and change > the show method to use the private one. > > class Bag { > has %.items; > > method !show-item ($msg, $item, $attr) { > # dd $msg; dd $item; dd $attr; # all Str > say "$msg ", %items{$item}.$attr > if %!items{$item}:exists; > } > > method show { > self!show-item('Ropa', 'ropa', 'amount'); > ... > } > } > > Now I get an error, the line corresponds to the private method > No such method 'CALL-ME' for invocant of type 'Str' > > Try a few variants like return instead of say or things like > say "$msg", "%!items{$item}.$attr"; # output: Ropa > Items::Cloth<94810994868552>.amount > say "$msg", $!items{$item}.{$attr}; # output: Type Items::Cloth does > not support associative indexing. > say "$msg", %!items{$item}."{$attr}"; # ouput: gives a compile error > > The output I'm expecting is: Ropa 4 > Ropa is the $msg, and 4 corresponds to the value in the attribute amount. > > Is there a way to refactor my code? Thanks in advance.