access hash member of type array within array of hashes

Question

I have an array of anonymous hashes like this:

my @arrayOfHashes=(
    {
        name => 'foo',
        value => ['one', 'two']
    },
    {
        name => 'bar',
        value => ['two', 'three']
    }
);

I'm trying to iterate over the array and access the array within each hash:

foreach (@arrayOfHashes) {
    print $_->{'value'} # ARRAY(0x88489f4)
}

The value that is printed above is not what I want... I want to use that array so it works like this:

print qw(one two) # onetwo

But, when I use qw like this:

my @arrayOfHashes=(
    {
        name => 'foo',
        qw(one two)
    },
    {
        name => 'bar',
        qw(three four)
    }
);

I get this error message at runtime (I am using strict mode):

Odd number of elements in anonymous hash at ...

How do I reference the "value" array within the foreach block?

@{$_->{'value'}}.. the error message should not occur.. since there is an even number of elements in the hashes.. for example (name, 'foo', "one", "two") — Håkon Hægland
– Håkon Hægland, Commented Jul 28, 2015 at 19:23

ikegami · Accepted Answer · 2015-07-28 19:23:25Z

4

So you have a reference to an array you want to dereference. The equivalent of @array for when you have a reference is @{ $ref }, so

print("@array\n");

print(join(', ', @array), "\n");

would be

print("@{ $_->{value} }\n");

print(join(', ', @{ $_->{value} }), "\n");

References:

answered Jul 28, 2015 at 19:23

ikegami

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