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

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
One problem is that if you write
\sub {<=>}
, the <=> doesn't receive any arguments (and doesn't even parse the way you want it to, because the parser expects a term, but finds an operator instead). So you have to write something like

sub { $_[0] <=> $_[1] }

instead. This code seems to work:

#!/usr/bin/perl use strict; use warnings; use 5.010; my $sort = 'hours'; # really comes from a switch my %map = ( # sorting map hours => [0, sub {$_[0] <=> $_[1]}], code => [1, sub {$_[0] cmp $_[1]}], name => [2, sub {$_[0] cmp $_[1]}], ); # example data my @records = ( [10, 'xyz232', 'secret project'], [ 5, 'foo123', 'world domination'], [ 7, 'bar666', 'have a beer'], ); my $elem = $map{$sort}[0]; my $sorter = $map{$sort}[1]; my @sorted = sort { $sorter->($a->[$elem], $b->[$elem]) } @records; say join "\t", @$_ for @sorted;

In reply to Re: Comparing spaceships (cmp and <=> as options) by moritz
in thread Comparing spaceships (cmp and <=> as options) by Random_Walk

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
  • Outside of code tags, you may need to use entities for some characters:
            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 browsing the Monastery: (7)
    As of 2014-08-30 05:11 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The best computer themed movie is:











      Results (291 votes), past polls