Re^3: assigning arrays as values to keys of hash

[kevbot]

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;