Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

comment on

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

The word unique nearly always call for a hash to be used. The solutiom is to extract the names, then to use them as (unique) keys to a hash.

#!/bin/perl -w use strict; my %unique_names; # this is the hash while( <DATA>) { my @values= split /\|/; # extract the fields (don't + forget to backslash the |) my @names= split /,\s*/, $values[2]; # extract the names foreach my $name (@names) { $unique_names{$name}++; } # we don't really care abou +t the value, just the key } my @unique_names= keys %unique_names; # put the names back into a +n array print join "-", @unique_names; print "\n"; __DATA__ value 1|value 2|tom, chris, dave|value 4 value 1|value 2|peter, tom, dave|value 4

In reply to Re: creating unique list from elements in an array by mirod
in thread creating unique list from elements in an array by rimmern

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



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

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

How do I use this? | Other CB clients
Other Users?
Others musing on the Monastery: (2)
As of 2023-01-28 03:41 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?