perl - 如何引用 Perl 中的特定哈希值？

Question

如何创建对特定哈希键中值的引用。我尝试了以下但 $$foo 是空的。任何帮助深表感谢。

$hash->{1} = "one";
$hash->{2} = "two";
$hash->{3} = "three";

$foo = \${$hash->{1}};
$hash->{1} = "ONE";

#I want "MONEY: ONE";
print "MONEY: $$foo\n";

Answer 1

use strict;
use warnings;
my $hash;

$hash->{1} = "one";
$hash->{2} = "two";
$hash->{3} = "three";

my $foo = \$hash->{1};
$hash->{1} = "ONE";
print "MONEY: $$foo\n";