Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
When processing CSV files, I usually use Text::CSV to read in the first line to get the column headings and then I use that information to index into the rest of the data by column names (I know what the columns are called, but I don't know what column number they are). Currently, I use the following code, which does not feel very Perl-ish.
use warnings; use strict; use Text::CSV; # setup a CSV parser my $csvParser = Text::CSV->new({ binary => 1, sep_char => ',', empty_i +s_undef => 1 }) or die "Cannot create new CSV parser: $!\n"; open my $csvHandle, "<", $csvFile or die "could not open $csvFile: $!" +; # figure out the column headings from the first line my @csvColumns = (); foreach my $colName (@{$csvParser->getline($csvHandle)}) { push @csvColumns, $colName; } # reverse that to allow lookup by name my %csvColumns; for my $colNum (0 .. scalar(@csvColumns)-1) { $csvColumns{$csvColumns[$colNum]} = $colNum; } # access some column in the CSV file by name while (my $line = $csvParser->getline($csvHandle)) { print "Column Foo has value $$line[$csvColumns{Foo}]; }
Is there a more perl-like way to reverse an array into a hash that could then be used to get the index into the data?

In reply to Perl-ish way to create hash from array by gri6507

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 scrutinizing the Monastery: (7)
    As of 2015-07-04 02:40 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 (57 votes), past polls