caesarsCipher.js

function transformString(str) {
  let transformed = "";

  for (let i = 0; i < str.length; i++) {
    let letter = str[i];

    if (/[a-zA-Z]/.test(letter)) {
      let ascii = letter.charCodeAt(0);
      ascii += 13;

      if ((ascii > 122) || (ascii > 90)) {
        ascii -= 26;
      }
      transformed += String.fromCharCode(ascii);
    } else {
      transformed += letter;
    }
  }
  return transformed;
}

function rot13(str) {

let arr = [str];
console.log(arr);
let newArr = [];
let novo;

for(let i = 0; i < arr.length; i++){
  for(let j = 0; j < arr[i].length; j++){
    newArr.push(transformString(arr[i][j]))
  }
}


novo = newArr.join("")
console.log(novo)
return novo 
}

rot13("SERR CVMMN!");