use Perl

I just realized that my problem with trans was that I had that extra space between the function call and the paren. With that removed, trans works perfectly, and makes a more elegant version of my script:

my $wordlist_filename = "wordlist.txt";
my $test_numbers_filename = "numbers.txt";

sub Number (Str $s)
{
    my $result = lc($s);
    $result.=trans('abc' => '2', 'def' => '3', 'ghi' => '4',
                   'jkl' => '5', 'mno' => '6', 'prs' => '7',
                   'tuv' => '8', 'wxy' => '9');
    return $result;
}

my $wordlist = open($wordlist_filename);
    # err die "Could not open $wordlist: $!\n";

my %numbers;

for (=$wordlist) -> $word
{
    if ($word ~~ /^\w\w\w\w\w\w\w$/)
    {
        my $number = Number($word);
        say "$word ==> $number";
        %numbers{$number} = $word;
    }
}
close ($wordlist);

my $test_numbers = open($test_numbers_filename);
for (=$test_numbers) -> $number
{
    my $word = %numbers{$number};
    say "$number ==> $word";
}
close ($test_numbers);

Note that in a comment jj suggests a much more spiffy and Perlish way of doing this, which I may try translating to Perl 6 if I get ambitious....