Beefy Boxes and Bandwidth Generously Provided by pair Networks
"be consistent"
 
PerlMonks  

Comment on

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

Firstly, you have no duplicates in any (of what you're calling) "scope". G123465798 is not a duplicate of G123456798: you've transposed the 5 and the 6. I've fixed this in the example below.

There's a standard idiom for checking for duplicates in this sort of scenario. Use a hash (often called %seen) that has as its keys whatever identifier you're checking. While processing, if the key exists, it's a duplicate, so skip/flag/etc. as appropriate; if the key doesn't exist, it's unique, so use it and then add it to the hash (usually done with a postfix increment).

Here's an example using your fixed data:

#!/usr/bin/env perl -l use strict; use warnings; my @data = ( [ qw{E123456789 G123456798 h12345} ], [ qw{E1234567 E7899874 G123456798 G123456789 G123456798 h1245} ], ); for my $scope (@data) { my %seen; for my $identifier (@$scope) { print $identifier unless $seen{$identifier}++; } }

Output:

E123456789 G123456798 h12345 E1234567 E7899874 G123456798 G123456789 h1245

-- Ken


In reply to Re^3: Reading file and matching lines by kcott
in thread Reading file and matching lines by Jalcock501

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!
  • 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 taking refuge in the Monastery: (12)
    As of 2015-07-31 16:13 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (279 votes), past polls