use Data::Dumper;
my %hash;
$hash{tree} = 4;
$hash{tree}->{apple} = 6; 
print Dumper \%hash;

[download]

Run that. When you understand why "4" does not appear in the output, then you will find enlightenment.

Update: d'oh! "6" doesn't appear in the output. In my defence, the above code was typed on a mobile device where I didn't have a copy of Perl to test it. A flimsy defence, I admit.

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In reply to Re: (another) HoH question by tobyink
in thread (another) HoH question by zuma53

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