Perl6之二 - sigil(obsolete)
newer version is here
与Perl5很不相同的是，sigil不会变化，scalar永远是$，array永远是@，hash永远是%
e.g.
Perl6:
my $scalar = [1,2,3];
$scalar[0]; # return 1
my @array = (1,2,3);
@array[0]; # return 1
my %hash = ( one => 1, two => 2 );
%hash; # return 1, equal to %hash{'one'}
等价的Perl5:
my $scalar = [1,2,3];
${$scalar}[0]; # return 1
my @array = (1,2,3);
$array[0]; # return 1
my %hash = ( one => 1, two => 2 );
$hash{one}; # return 1
Perl6增加了secondary sigil (twigil)，以用来指代不同scoping的变量。
e.g.
$*foo为全局变量，$=foo为pod变量，$.foo为object attribute accessor。