CODEWITHSUNDEEP
perl
bit-question
bit-question

Reputation: 3843

the correct approach of connecting a hash of array to another hash of hash

I have a hash structure, where each key corresponds to a "value", which is an array. I defined and constructed this hash structure as follows:

my %app
push @{$app{$id}}, $id;

I am trying to make this hash structure to be indexed by another hash structure,

my %chainro

which itself is a hash of hash. It looks like there have three different approaches to connect these two structure, I am not sure which one is correct.

$chainro{$ro}{$id} = $app{$id}

@{$chainro{$ro}{$id}} = @{$app{$id}}

$chainro{$ro} = \%app;

Upvotes: 2

Views: 94

Answers (1)

Dan
Dan

Reputation: 10786

The last one:

my %app
push @{$app{$id}}, $id;
$chainro{$ro} = \%app;

And you can then access an element:

$chainro{$ro}->{$id}->[$index]

The -> are needed when you are accessing a hash or array using a reference rather than the hash or array itself.

Upvotes: 2

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