CODEWITHSUNDEEP
arraysperldata-structureshash
BIGMOOSE
BIGMOOSE

Reputation: 146

Sorting an array of hashes, based on the value of a particular key within each hash in perl

I've done some searching and struggled to find the answer to this one.

Say I have an array of hashes like this..

my @AoH = (
    {   'ip_type'     => 1,
        'ip_ref'      => 0001,
        'ip_address'  => '192.168.0.1',
        'ip_priority' => '100'
    },
    {   'ip_type'     => 1,
        'ip_ref'      => 0002,
        'ip_address'  => '192.168.0.2',
        'ip_priority' => '1'
    }
);

In context, these are multiple IP addresses, in which I intend to load balance across. The 'ip_priority' value dictates which is first, and subsequently which is second in pirority. primary and backup, basically.

However, I want to order the array elements (aka the hashes) numerically based on the ip priority value within the hash.

So, preferably the above AoH would be...

my @AoH = (
    {   'ip_type'     => 1,
        'ip_ref'      => 0002,
        'ip_address'  => '192.168.0.2',
        'ip_priority' => '1'
    },
    {   'ip_type'     => 1,
        'ip_ref'      => 0001,
        'ip_address'  => '192.168.0.1',
        'ip_priority' => '100'
    }
);

so $AoH[0]->{ip_priority} now cotains 1 and $AoH[1]->{ip_priority} contains 100.

How can I perform a sort in order to achieve the second example above? im struggling to find a workable example!

Upvotes: 1

Views: 111

Answers (1)

clt60
clt60

Reputation: 63892

You can use:

my @sorted = sort {$a->{ip_priority} <=> $b->{ip_priority}} @AoH;

Upvotes: 3

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