Hi all.
I've got the following question:
I've got n arrays, that all contain data.
I want to return a new array, containing only the data, that exist in all n arrays mentioned above.
(i hope i'm clear in what i want)
Right now, my following solution works, but i wonder if there is a more clever and fast way to do this:
# If my datasets contain
# @1 = 1,2,3,4,5
# @2 = 2,3,6,7,8,8,8,9,10
# @3 = 5,6,2,3
#
# the result should be: 2,3
#
my %intersection;
my @result;
foreach my $dataArray(@AllArraysIHave) {
my %lookuptable;
foreach(@{$dataArray}) {
if (!$lookuptable{$_}) {
$lookuptable{$_} = 1;
$intersection{$_}++;
}
}
}
my $amnt = scalar(@AllArraysIHave);
foreach my $key (keys %intersection) {
if ($intersection{$key} == $amnt) {
push @result, $key;
}
}
return \@result;
*update* Thanks for all the fast replies
lima1, indeed, it has to work for duplicate items as well. (changed the example a little.)
"We all agree on the necessity of compromise. We just can't agree on when it's necessary to compromise." - Larry Wall.
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