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# Sorting Hashes

Posted on 2005-03-29
Medium Priority
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I have a set of hashes, the hash key \$val is used as a primary key in each hash.
Each hash presents a simple counter, counting up the amount of states for
the hash key. Enum this hashes look like eg:

for my \$val (keys %ConTotal ){
print "Adress: \$val, Total: \$ConTotal{\$val}, FIN: \$ConStateFin{\$val}, SYN: \$ConStateSyn{\$val}\n";
}

Now i would like to display all hashes in a table and sort descending for eg. %ConStateFin,
what is the best way of doing this ?
Many Thanks
0
Question by:MKrauss
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Accepted Solution

kandura earned 1000 total points
ID: 13655673
you can sort the keys of %ConTotal according to whatever criteria you want:

for my \$val( sort { \$ConStateFin{\$b} <=> %ConStateFin{\$a} } keys %ConTotal ) {

This would sort descending on the values of %ConStateFin. If you switch \$a and \$b around, it would sort ascending. The comparison is <=>, which is numerical. If the values of %ConStateFin are strings, you might want to use cmp instead:

for my \$val( sort { \$ConStateFin{\$a} cmp %ConStateFin{\$b} } keys %ConTotal ) {
0

LVL 1

Author Comment

ID: 13655774
Great ! Many Thanks
0

LVL 18

Expert Comment

ID: 13655885
I hope you caught my typo in the examples: the second mention of ConStateFin should be preceded by a \$, not a %:

for my \$val( sort { \$ConStateFin{\$b} <=> \$ConStateFin{\$a} } keys %ConTotal ) {

0

LVL 1

Author Comment

ID: 13656057
yes i noticed the typo, thought you're testing me .... thanks
0

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Expert Comment

ID: 13660077
What happens to the sort when a key in %Contotal is not present as a valid key of %ConStateFin

for my \$val( sort { \$ConTotal{\$a} cmp %ConTotal{\$b} } keys %ConTotal ) {

Also, are you expecting that each key will either be present in all the hashes or in none of them?? What happens if a key in
%ContStateFin is not present in %Contotal...??

Manav
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