The exists function returns true if a hash key (or array index) has been defined, and false if not. : exists « Hash « Perl






  1. Perl
  2. Hash
  3. exists

The exists function returns true if a hash key (or array index) has been defined, and false if not.

    

#Format: exists $ASSOC_ARRAY{KEY}

#!/usr/bin/perl
%employees=("Tester" => "Joe",
            "Coder" => "Teddy",
            "Clerk" => "Tom",
           );
print "exists.\n" if exists $employees{"Tester"};
print "The Clerk exists.\n" if exists $employees{"Clerk"};
print "The Boss does not exist.\n" if not exists $employees{"Boss"};








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