Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

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;

In reply to Re^3: assigning arrays as values to keys of hash by kevbot
in thread assigning arrays as values to keys of hash by pearllearner315

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others lurking in the Monastery: (5)
    As of 2019-06-25 00:24 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      Is there a future for codeless software?



      Results (100 votes). Check out past polls.

      Notices?