Re^2: pushing multiple key-value pairs into an existing hash

[lomSpace]

I don't want to add them one by one nor create another hash and combine the two. I was wondering if there is a way to take what's under __DATA__ and add each key-value pair dynamically?

[Kenosis]

You said, ...push multiple key-value pairs onto an existing hash. Just to clarify, values (scalars) are pushed onto an array; you don't push onto a hash.

The push in your while loop adds array references as values associated with keys, so you see a mix of data from the Dumper output (your push @{$gene{$key}}, $value; notation says treat the key's associated value as an array and push the contents of $value onto that array):

$VAR1 = {
          'HES4' => '57801',
          'TMEM52' => [
                        '339456'
                      ],
          'SSU72' => [
                       '29101'
                     ],
          'GNB1' => [
                      '2782'
                    ],
          'PLEKHN1' => '84069',
          'NCRNA00115' => '79854',
          'ATAD3A' => [
                        '55210'
                      ],
          'ATAD3B' => [
                        '83858'
                      ],
          'SLC35E2' => [
                         '9906'
                       ],
          'SAMD11' => '148398',
          'NOC2L' => '26155'
        };

The [ ] notation indicates a list--each one having been generated by the push--so your hash now contains array references and non-reference values.

choroba has shown you how to add the key-value pairs to an existing hash (which will overwrite an existing value, if the key already exsits):

while(<DATA>){
    chomp;
    my ($key, $value) = split;
    $gene{$key} = $value; # choroba's suggestion
}

Dumper output:

$VAR1 = {
          'HES4' => '57801',
          'TMEM52' => '339456',
          'SSU72' => '29101',
          'GNB1' => '2782',
          'PLEKHN1' => '84069',
          'NCRNA00115' => '79854',
          'ATAD3A' => '55210',
          'ATAD3B' => '83858',
          'SLC35E2' => '9906',
          'SAMD11' => '148398',
          'NOC2L' => '26155'
        };

Is this what you wanted to achieve?

[lomSpace]

Yes!,/p>

[Kenosis]

You were just that close...

[choroba]

I do not undestand. __DATA__ is a filehandle. There is no method to add a filehandle's content to a hash. In your example, though, you are using

while (<DATA>) {

which seems like iterating over the filehandle line by line. What exactly do you need? Why is adding the pairs one by one or creating a temporary hash not an option?

[lomSpace]

If adding a temp hash is the route then I can do that.

[lomSpace]

I went ahead and used the map function. Did you have something else in mind?

[7stud]

Did map produce the results you want? If so, post your code, then someone can tell you if there is a better way.

By the way, map adds the key/value pairs one by one--just like a while loop.

[7stud]

I was wondering if there is a way to take what's under __DATA__ and add each key-value pair dynamically?

How would that be done statically?

I don't want to add them one by one

Why not?