sort and How do I sort an array by (anything)?

Here's one way to do it with fairly complex sort criteria and a Schwartzian transform (assuming I've understood the requirements correctly):

#!/usr/bin/env perl
use warnings;
use strict;

use List::Util 'shuffle';
use Test::More tests=>1;

my @expect = qw/
    frooc froof froz
    ebaz eyun ebxu
    quz qun que /;

my @input = shuffle @expect;

sub special {  # sort routine used below
    $$a[1] <=> $$b[1]  # first sort by categories
    or  # then sort by the desired condition per category
    $$a[1]==1 ? $$a[0] cmp $$b[0]      # category 1 (/r/)
    : ( $$a[1]==2 ? $$a[2] cmp $$b[2]  # category 2 (/^e/)
      : $$b[3] cmp $$a[3] )            # category 3 (rest)
}
my @output = # sort with Schwartzian transform
    # Step 3: get back the orig_str out of the array
    map { $$_[0] }
    # Step 2: sort with the "special" function defined above
    sort special
    # Step 1: each item -> [orig_str, category, third_chr, last_chr]
    # where category is: /r/ => 1, /^e/ => 2, rest => 3
    map { [$_, /r/?1:(/^e/?2:3), substr($_,2,1), substr($_,-1,1)] }
      @input;

is_deeply \@output, \@expect
    or diag explain \@output;

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In reply to Re: How to perform different sorts on multiple sections of items in the same array by Anonymous Monk
in thread How to perform different sorts on multiple sections of items in the same array by estreb

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