exists function returns true if an array index (or hash key) has been defined, and false if it has not. : exists « Array « Perl

1. Perl
2. Array
3. exists

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

   

#Format: exists $ARRAY[index];

#!/usr/bin/perl
@names = qw(Tom Raul Steve Jon);
print "Hello $names[1]\n", if exists $names[1];
print "Out of range!\n", if not exists $names[5];

   
    
    
  

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