No need for that, just tweak the "tr" a little :) 

#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11145633
use warnings;
use List::AllUtils qw( shuffle sort_by );

my @weekdays = shuffle
  qw/Monday tuesday wednesday friday sunday Saturday Thursday/;

print "$_\n" for sort_by { lc =~ tr/muwht/a-d/dr } @weekdays; # Monday
+ first
print "\n";
print "$_\n" for sort_by { lc =~ tr/nmewhfatsu/a-g/dr } @weekdays; # S
+unday first

[download]

In reply to Re^4: Challenge: sort weekdays in week-order (elegantly and efficiently) by tybalt89
in thread Challenge: sort weekdays in week-order (elegantly and efficiently) by bliako

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