programming-examples/To tell if a given key name exists in a hash, you can use the exists operator.pl at master - programming-examples - michuIT: Everything is code

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 #if ( exists($hash{$key} ) ) {
 #  # ..
 #}
 $hash{"Name"} = "A";
 $hash{"Address"} = "B";
 $hash{"City"} = "C";
 if ( exists($hash{"City"} ) ) {
   print 'exists';
 }