Caesar Cipher

caesarCipher.md

function caesarCipher(str, num) {
  [...arr] = str.toLowerCase();
  return arr.map((val,indx,input)=> {
    if (val.match(/[^a-z]/gi)) return val.charCodeAt(0);
    let code = input.join('').charCodeAt(indx) + num;
    return ( 96 < code && code < 123) ? code : 
    				(code >= 123) ? code - 26 : code + 26;
  });
  
}

let ans = String.fromCharCode(...caesarCipher('This is very important information',13));
console.log(ans);