ROT13 Convert

script

let input = editor.getSelectedText().toLowerCase().split('');
let output = "";
let alphabet = "abcdefghijklmnopqrstuvwxyz";
alphabet = alphabet.split('');

input.forEach(char => {
 let i = alphabet.indexOf(char);
 if (i > -1) {
  let n = i + 13 >= alphabet.length ? i + 13 - alphabet.length : i + 13;
  output += alphabet[n];
 } else {
  output += char;
 }
});

 editor.setSelectedText(output);