That line will work if you return a list of objects.

Say you want to create an object for each element of a hash, where name is the key of the element, and val is the value of the element. 

sub parameter {
   ...
   return map { NameValTuple->new( name => $_, val => $rv{$_} } keys(%
+rv);
}

[download]
If you instead returned a list of hashes, it would look like 
print $_->{name}, ': ', $_->{val}, "\n" for $objA->parameter( 'a.x' );

[download]

To return a list of hashes, you'd use 

sub parameter {
   ...
   return map { +{ name => $_, val => $rv{$_} } } keys(%rv);
}

[download]

(The "+" might not be needed. You can remove it if you don't get an error without it.)

In reply to Re: how to let sub return hash of 2 sub? by ikegami
in thread how to let sub return hash of 2 sub? by toohoo

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