use strict;
use warnings;                                                         
+       

my @names = ('some','keys','are','redundant','keys');
my @values = (1,      3,     4,    5,          2);

my %h = ();
# so that the hash will be accessible outside the while loop          
+                           

my $i = 0;
while( $i < 5 ) { # a foreach loop would've been better               
+                           
    my $name = $names[$i];
    my $value = $values[$i];
    unless( defined $h{$name} and $h{$name} > $value ) {
        # either this is new key-value pair,                          
+                           
        # or the value is bigger than what the hash                   
+                           
        # has currently                                               
+                           
        $h{$name} = $value;
    }
    $i = $i + 1;
}

# now print the results                                               
+                           

foreach my $key (keys %h) { # keys are in random order
    print "$key,$h{$key}\n";
}
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This little program produces the following output:

keys,3
redundant,5
are,4
some,1
[download]