programming-examples/perl/Hash/Hash (Associative Array) Functions- The keys function returns, in random order, the keys of a hash.pl

#Format:
#keys(ASSOC_ARRAY)
#keys ASSOC_ARRAY

# The keys function returns the keys of a hash
%weekday= (    '1'=>'Monday',
               '2'=>'Tuesday',
               '3'=>'Wednesday',
               '4'=>'Thursday',
               '5'=>'Friday',
               '6'=>'Saturday',
               '7'=>'Sunday',
              );
foreach $key ( keys(%weekday) ){print "$key ";}
print "\n";
foreach $key ( sort keys(%weekday) ){print $key ;}
print "\n";