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grep hash ref from array of hashes perl

Posted on 2013-12-15
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Last Modified: 2013-12-15
I have an array which is populated with hash refs the format looks like this

$VAR1 = [
                  [
             {
              'name' => 'Mayotte',
              'show_states' => '0',
              'country_iso_code' => 'YT'
            },
            {
              'country_iso_code' => 'ZA',
              'show_states' => '0',
              'name' => 'South Africa'
            },
            {
              'country_iso_code' => 'ZM',
              'name' => 'Zambia',
              'show_states' => '0'
            },
            {
              'name' => 'Zimbabwe',
              'show_states' => '0',
              'country_iso_code' => 'ZW'
            }
          ]
];

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I would like each hashref in the array to have it's own key so

$VAR1 = [
             {
              'name' => 'Mayotte',
              'show_states' => '0',
              'country_iso_code' => 'YT'
            },
];
$VAR2 = [
             {
              'name' => 'Mayotte',
              'show_states' => '0',
              'country_iso_code' => 'YT'
            },
];

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How can I do this?
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Question by:hexfusion
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11 Comments
 
LVL 85

Expert Comment

by:ozo
ID: 39720152
use Data::Dumper;
$VAR1 = [
                  [
             {
              'name' => 'Mayotte',
              'show_states' => '0',
              'country_iso_code' => 'YT'
            },
            {
              'country_iso_code' => 'ZA',
              'show_states' => '0',
              'name' => 'South Africa'
            },
            {
              'country_iso_code' => 'ZM',
              'name' => 'Zambia',
              'show_states' => '0'
            },
            {
              'name' => 'Zimbabwe',
              'show_states' => '0',
              'country_iso_code' => 'ZW'
            }
          ]
];

print Dumper @{[map[$_],@{$VAR1->[0]}]};
0
 
LVL 2

Author Comment

by:hexfusion
ID: 39720185
I might of worded this wrong or misunderstand you my @array has the output from dumper.

$VAR1 = [
                  [
             {
              'name' => 'Mayotte',
              'show_states' => '0',
              'country_iso_code' => 'YT'
            },
            {
              'country_iso_code' => 'ZA',
              'show_states' => '0',
              'name' => 'South Africa'
            },
            {
              'country_iso_code' => 'ZM',
              'name' => 'Zambia',
              'show_states' => '0'
            },
            {
              'name' => 'Zimbabwe',
              'show_states' => '0',
              'country_iso_code' => 'ZW'
            }
          ]
];

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to get @array to now have this format

$VAR1 = [
             {
              'name' => 'Mayotte',
              'show_states' => '0',
              'country_iso_code' => 'YT'
            },
];
$VAR2 = [
             {
              'name' => 'Mayotte',
              'show_states' => '0',
              'country_iso_code' => 'YT'
            },
];

Open in new window

0
 
LVL 85

Expert Comment

by:ozo
ID: 39720196
use Data::Dumper;
$VAR1 = [
                  [
             {
              'name' => 'Mayotte',
              'show_states' => '0',
              'country_iso_code' => 'YT'
            },
            {
              'country_iso_code' => 'ZA',
              'show_states' => '0',
              'name' => 'South Africa'
            },
            {
              'country_iso_code' => 'ZM',
              'name' => 'Zambia',
              'show_states' => '0'
            },
            {
              'name' => 'Zimbabwe',
              'show_states' => '0',
              'country_iso_code' => 'ZW'
            }
          ]
];
@array=($VAR1);
print Dumper @array;
print Dumper @{[map[$_],@{$array[0][0]}]};
print Dumper @{$array[0][0]};
0
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LVL 85

Expert Comment

by:ozo
ID: 39720198
How did you create @array?
Your second $VAR1 and $VAR2 both look like the your first [$VAR1->[0][0]]
and your first $VAR1 looks like a reference to an array containing a single reference to an array of hash refs
0
 
LVL 2

Author Comment

by:hexfusion
ID: 39720220
I created this with the following

push @array, {'country_iso_code' => $country_code, 'name' => $country_name, 'show_states' => $has_state};

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0
 
LVL 85

Accepted Solution

by:
ozo earned 2000 total points
ID: 39720228
push @array, {'country_iso_code' => $country_code, 'name' => $country_name, 'show_states' => $has_state};
print Dumper @array;
#would have produced something like
$VAR1 = {
          'name' => undef,
          'show_states' => undef,
          'country_iso_code' => undef
        };

Did you instead do
print Dumper [\@array];
or
print Dumper [[@array]];
0
 
LVL 2

Author Comment

by:hexfusion
ID: 39720239
you know what it was my submodule was like this

sub foo{
[...]
return \@array;
}
I then call it with

my @array = Foo::Bar->new->foo
0
 
LVL 85

Expert Comment

by:ozo
ID: 39720250
Try

return @array;
...
my @array = Foo::Bar->new->foo

or

return \@array;
...
my @array = @{ Foo::Bar->new->foo}
0
 
LVL 85

Assisted Solution

by:ozo
ozo earned 2000 total points
ID: 39720265
And then you probably called
print Dumper \@array;
instead of
print Dumper @array;

And I'm also guessing you don't actually want the extra [ ] in $VAR2
0
 
LVL 2

Author Comment

by:hexfusion
ID: 39720273
right thanks a lot still a little green here
0
 
LVL 2

Author Closing Comment

by:hexfusion
ID: 39720275
thanks a lot
0

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