Rob Dixon wrote:
> 
> You can pass single hashes to and from subroutines as a simple list. So you
> successfully passed in %db_del, for instance, but if you need to keep two or
> more hashes separate you must pass them by reference.

I should also have mentioned that a hash won't stay sorted, so you can't write a
subroutine that sorts a hash and returns it. If you need to access a hash in
sorted order it's usual to keep a sorted array of keys in parallel with the 
hash.

Rob

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