In this one record or in all records?

my $kids= scalar @{$rec[0]{kids}};

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If you want the sum of kids in all records you just have to add a loop around that line:

my $kids;
foreach my $record (@rec) {
  $kids+= scalar @{$record->{kids}};
}

[download]

In reply to Re: print array of hashes by jethro
in thread print array of hashes by fionbarr

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