PERL Beginners - Re: Return number of keys in a hash of hash? Looping through "sub hash"?

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Re: Return number of keys in a hash of hash? Looping through "sub hash"?

Tom Phoenix

2008-01-24, 7:07 pm

On Jan 24, 2008 9:07 AM, <pzimmermann@gmail.com> wrote:

> I'd like to get the number of keys in hash of hashes. I know that I
> can do something like $count = keys( %myHash ), but how would I go
> about finding the number of keys in a sub-hash?

my $count = keys %{ $sub_hash_reference };

You can replace $sub_hash_reference with any expression that returns
the reference to your sub-hash, such as $myHash{fred}, say.

> Alternately, how could I loop through keys in a hash of a hash?

foreach my $key (keys %{ $sub_hash_reference }) { ... }

Hope this helps!

--Tom Phoenix
Stonehenge Perl Training

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