Perl, dereference array of references

Question

In the following Perl code, I would expect to be referencing an array reference inside an array

#!/usr/bin/perl

use strict;
use warnings;

my @a=([1,2],[3,4]);
         


        

Answer 1

This stuff is tricky.

@$a[0] is parsed as (@$a)[0], dereferencing the (undefined) scalar $a

You wanted to say @{$a[0]}.