How do I create a hash of hashes in Perl?

Question

Based on my current understanding of hashes in Perl, I would expect this code to print \"hello world.\" It instead prints nothing.

%a=();

%b=();
$b{str} = \         


        

Answer 1

Mike, Alexandr's is the right answer.

Also a tip. If you are just learning hashes perl has a module called Data::Dumper that can pretty-print your data structures for you, which is really handy when you'd like to check what values your data structures have.

use Data::Dumper;
print Dumper(\%a); 

when you print this it shows

$VAR1 = {
          '1' => {
                   'str' => 'hello'
                 },
          '2' => {
                   'str' => 'world'
                 }
        };