Caesars Cipher: One of the simplest and most widely known ciphers is a Caesar cipher, also known as a shift cipher. In a shift cipherthe meanings of the letters are shifted by some set amount. A common modern use is the ROT13 cipher, where the values of the letters are shifted by 13 places. Thus 'A' ↔ 'N', 'B' ↔ 'O' and so on. Write a function w…

caesarsCipher.js

function rot13(str) { // LBH QVQ VG!
  let newStr = '';
  for(let i=0; i<str.length; i++){
      let asciiCode = str.charCodeAt(i);
      if(asciiCode>=78 && asciiCode <=90){
          asciiCode = asciiCode - 13;
      }else if(asciiCode <78 && asciiCode >= 65){
          asciiCode = asciiCode + 13;
      }
      newStr += String.fromCharCode(asciiCode);
  }
  return newStr;
}

// Change the inputs below to test
//rot13("SERR PBQR PNZC");
//rot13("GUR DHVPX OEBJA SBK WHZCF BIRE GUR YNML QBT.");
rot13("SERR CVMMN!");