Hi Monks! I've got a bit of a question which i'm hoping could make one of my scripts a bit more concise

Essentially i have a hash of arrays (massively simplified):

my %hash=('ID' => {
                  'key1' => [key1_val1, key1_val2],
                  'key2' => [key2_val1, key2_val2]
                  }
          );

[download]

And i need to expand it out to look like this:

ID, 1, key1_val1, key2_val1
ID, 2, key1_val1, key2_val2
ID, 3, key1_val2, key2_val1
ID, 4, key1_val2, key2_val2

[download]

So each key is a field of data With various values and i need to expand out a single line for each combination given. As i said, this i massively simplified and i actually have ~15 'keys' and each can have about 11-12 values in it's array.

I'm currently doing it the obvious way of:

my $id2=1;
my %data=();
foreach my $id (keys(%hash)) {
  foreach my $key1_val (@{$hash{$id}{'key1'}}) {
    foreach my $key2_val (@{$hash{$id}{'key2'}}) {
      $id2++;
      $data{$id}{$id2}{'key1'}=$key1_val;
      $data{$id}{$id2}{'key2'}=$key2_val;
    }
  }
}

[download]

Which is fine but everytime i add a new field it get a bit unwieldy. I have "foreach" statements running off the side of the monitor and onto my wall!! Help!

Apologies if there's any mistakes in the above. It's been a long day. Any help appreciated as ever!

In reply to Massive expansion of a hash of arrays? by Amblikai

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