I am not that experienced with the Perl and I am not a programmer by nature although I have been touched by Perl since years, I still have no idea on how to use map,grep and bar inside hash tables. I can use it on arrays but that would be about it. I have tried to make it work the easy to understand way by using foreach loops and if statement and then pushing everything into a new hash but got totally stuck as you would be able to imagine. I could not find much documentation on the different handling possibilities of hash tables although I don't tend to use anything else then hash tables in my codes. If anybody has some good documentation/examples on how to use functions with hash tables like map and grep that would be great.