arrays,perl,hash,hash-of-hashes , Parsing a HoAoHoAoHoAoH in Perl

## Question:

Tag: arrays,perl,hash,hash-of-hashes

I am new to Perl and have a little idea about hashes. I have a hash of array of hash of array of hash of array of hash (HoAoHoAoHoAoH) as follows.

``````%my_hash = (
key00 => 'value00',
key01 => [
{  key10 => 'value10',
key11 => 'value11',
key12 => [
{   key20  => 'value20',
key21  => 'value21',
key22  => [
{   key30  => 'value30',
key31    => [
{ color => 'blue',  quantity => 10, boxes => [0,1,3] },
{ color => 'red',   quantity => 2,  boxes => [2,3]   },
{ color => 'green', quantity => 5,  boxes => [0]     },
],
},
],
},
]
}
]
);
``````

What is the easiest way to access the "color", "quantity" and "boxes"? I also need to do arithmetic operations with the "quantity"s, such as 10+2+5 (quantity0+quantity1+quantity2).

This looks a lot like an XY problem. What are you trying to solve here?

You can access an element of your data structure like this:

``````print \$my_hash{key01}[0]{key12}[0]{key22}[0]{key31}[0]{color},"\n";
``````

You can also iterate the bottom elements with:

``````foreach my \$something ( @{ \$my_hash{key01}[0]{key12}[0]{key22}[0]{key31} } ) {
print \$something->{'color'};
print \$something->{'quantity'}
}
``````

But this doesn't look like a real problem - what are you actually trying to accomplish? I might guess you're trying to parse XML or similar, in which case there's almost certainly a better approach.

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