Why do you need a hash of arrays? Is this question related to homework? As mentioned by jwkrahn, using a multi-level hash would allow you to readily avoid duplicates.
I have the current code that works but it doesn't get rid of the duplicates
The code you posted does not seem to work. When I ran your code, the hash keys contained an entire line of text and the values were undefined array references. When I removed the double quotes from the first argument to split, I was able to get a hash of array references. However, as you mentioned, there are duplicates in the array references.
#!/usr/bin/env perl
use strict;
use warnings;
use Data::Dumper;
my $file = 'file.txt';
open( FILE, '<', $file ) or die $!;
my %hash;
while ( <FILE> ) {
chomp;
my $lines = $_;
my $key = (split(/ /, $lines))[0];
my $value = (split(/ /, $lines))[1];
push @{ $hash{$key} }, $value;
}
print Dumper(\%hash);
exit;
There are quite a few ways you could go about removing the duplicates. Here is one way to do it with help from the uniq function of List::Util.
#!/usr/bin/env perl
use strict;
use warnings;
use Data::Dumper;
use List::Util qw/uniq/;
my $file = 'file.txt';
open( FILE, '<', $file ) or die $!;
my %hash;
while ( <FILE> ) {
chomp;
my $lines = $_;
my ($key, $value) = split(/ /, $lines);
push @{ $hash{$key} }, $value;
}
foreach my $key( keys %hash ){
my @array = @{$hash{$key}};
my @uniq_elems = uniq @array;
$hash{$key} = \@uniq_elems;
}
print Dumper(\%hash);
exit;
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