Question

I would like to make the value the key, and the key the value. What is the best way to go about doing this?

Answer 1

Adapted from http://www.dreamincode.net/forums/topic/46400-swap-hash-values/:

Assuming your hash is stored in $hash:

while (($key, $value) = each %hash) {
   $hash2{$value}=$key;
}

%hash=%hash2;

Seems like much more elegant solution can be achieved with reverse (http://www.misc-perl-info.com/perl-hashes.html#reverseph):

%nhash = reverse %hash;

Note that with reverse, duplicate values will be overwritten.