package Foo {
  use Moo;
  has a => (is => "ro");
  has b => (is => "ro");
}

my $bar = Foo->new(a => 42);

# Print only 'a'
say $_ for keys %{ $bar }

# Print all attributes
say $_ for keys( %{
   'Moo'->_constructor_maker_for('Foo')->all_attribute_specs
});

moo oop perl attributes meta introspection

drag-and-drop list ui js-ecosystem javascript sort

drag-and-drop javascript js-ecosystem ui sort list