Hash Perl

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  4. To tell if a given key name exists in a hash, you can use the exists operator
#if ( exists($hash{$key} ) ) {
#  # ..
#}
$hash{"Name"} = "A";
$hash{"Address"} = "B";
$hash{"City"} = "C";
if ( exists($hash{"City"} ) ) {
  print 'exists';
}