Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change

Re: Hash of hash: testing for existence of higher level key (only)

by NetWallah (Abbot)
on Jun 22, 2012 at 06:13 UTC ( #977780=note: print w/replies, xml ) Need Help??

in reply to Hash of hash: testing for existence of higher level key (only)

If you know what the third level's key should be, you can check for existence:
if (exists $hash->{A}->{B2}->{C}) { ...
If you do not know, you will need to iterate:
for my $k (keys %{ $hash->{A}->{B2} } ){ ...
Why don't you TRY the code you think should work (or fail), and if it behaves differently from your expectations, we can help explain why.

As for the thing you were attempting in your previous node:

$hash->{'A'}->{'B2'}->{*} #is actually Equivalent to my @subkeys = keys %{ $hash->{A}->{B2} }; #at least - I think this is where you were heading...

             I hope life isn't a big joke, because I don't get it.

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://977780]
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others drinking their drinks and smoking their pipes about the Monastery: (3)
As of 2016-12-06 01:02 GMT
Find Nodes?
    Voting Booth?
    On a regular basis, I'm most likely to spy upon:

    Results (96 votes). Check out past polls.