Just an academic question regarding nesting capabilities.
For example:
%inner = (1, "monday", 2, "tuesday"...);
%outer = ("hello", 1, "days", %inner);
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1Yes — you can nest arrays (or, at least, references to arrays) more or less arbitrarily. And that applies to both ordinary arrays and hashes (associative arrays).Jonathan Leffler– Jonathan Leffler2021-07-13 19:57:41 +00:00Commented Jul 13, 2021 at 19:57
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See perldoc.perl.org/perldscShawn– Shawn2021-07-13 21:16:16 +00:00Commented Jul 13, 2021 at 21:16
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For a gentle tutorial intro to this topic, see: Mark's very short tutorial about referencesGrant McLean– Grant McLean2021-07-14 02:35:17 +00:00Commented Jul 14, 2021 at 2:35
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2 Answers
The value in a hash is always a scalar, but it can be a hash reference.
my %outer = (hello => 1,
days => \%inner);
Or you can enter an anonymous hash directly:
my %outer = (hello => 1,
days => {1 => 'Monday',
2 => 'Tuesday',
...});
Withour a reference, the "nested" hash is flattened, which is sometimes used to override default values:
my %conf = (%default, %specific);
Comments
Well you could always just have tried it. If you pass a reference of the first hash you can store it like a nested structure.
use Data::Dumper;
%inner = (1, "monday", 2, "tuesday");
%outer = ("hello", 1, "days", \%inner);
print(Dumper(\%outer));
print($outer{'days'}{2});
OUTPUT
$VAR1 = {
'hello' => 1,
'days' => {
'2' => 'tuesday',
'1' => 'monday'
}
};
tuesday
