caesarCipherCom.js

/*jshint esversion: 6 */
/*
Caesar Cipher is one of the earliest and simplest encryption technique. To encrypt a message, we shift the alphabets of the message by a fixed position or key.

For example, if message is ABC , and we shift each character by 3 characters, we will get DEF. Here key is 3.

*/


caesarCipher('Javascript',1);
function caesarCipher(string, number) {
    number %= 26;
    for (let lowerCaseString = string.toLowerCase(), alphabet = "abcdefghijklmnopqrstuvwxyz".split(""), shiftedString = "", i = 0; i < lowerCaseString.length; i++) {
      let curLetter = lowerCaseString[i];
      " " === curLetter ? shiftedString += curLetter : (curLetter = alphabet.indexOf(curLetter) + number, 25 < curLetter && (curLetter -= 26), 0 > curLetter && (curLetter += 26), shiftedString += alphabet[curLetter]);
    }
    console.log("Original Word: " + string + "\nNew String Shifted by " + number + " place: " + shiftedString);
  }