Course of Raku / Addendum 🆕 / Working with data / Text and strings / Exercises / Caesar cipher

Solution: Caesar cipher

Here is a possible solution to the task.

Code

my $text = 'HELLO';

$text ~~ tr/A..Z/D..ZA..C/;

say $text;

🦋 You can find the source code in the file caesar-cipher.raku.

Output

KHOOR

Comments

The transliteration operator tr/// maps characters from the first set to the second, position by position. A..Z lines up against D..ZA..C, so A becomes D, B becomes E, and the tail X Y Z wraps back to A B C.
tr/// changes the string in place, so $text itself holds the encrypted word after the match.

← Caesar cipher | Run-length encoding →