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  1. or download this
    sub foo {
   $_[0] = { all => "new" };
}
  2. or download this
    my %x = (foo => 0, bar => 1);

my $z = $x{foo};
$z = 2;
  3. or download this
    my %x = (foo => 0, bar => 1);

$x{foo} = 2;