CaesarCipher

function rot13(str) { // should decode input by adding 13 characters to it
let rejoinedWord = [];// declare an empty array to house returned word
let ourArray = str.split("");//split input charcters into an array 
var i = 0;// incrementor for while loop
while(i < ourArray.length) {
  //I want to print each letter of the array
  let ourCurrentCharacter = ourArray[i];
  console.log(ourCurrentCharacter);
  // if ourCurrentCharacter == a capital letter (regex?)
  let regex = /[A-Z]/;
if (ourCurrentCharacter.match(regex)){
  //to convert the English character to ASCII.
  let thisCharacter = ourCurrentCharacter.charCodeAt(); 
//  If the ascii code is less than 78, it’ll get out of range when subtracted by 13
//  so we’ll add 26 (number of letters in alphabet) so that after A it’ll go back to Z. e.g. M(77)
//  77-13 = 64(Not an English alphabet) +26 = 90  Z(90).
  if (thisCharacter < 78) {
    thisCharacter = thisCharacter +13;
    } else {thisCharacter = thisCharacter -13;}
  // convert ASCII to English
  thisCharacter = String.fromCharCode(thisCharacter);
  rejoinedWord.push(thisCharacter);
  console.log(rejoinedWord);}//end of if regex /A-Z/
//if ourCurrentCharacter cleared regex filter, add it back to the string
else { rejoinedWord.push(ourCurrentCharacter); };
  i++;//iterate array in while loop
  }//end of while loop

  let joinedArray = rejoinedWord.join('');//rejoined split array
  console.log(joinedArray);//sneak peak print out of what's returned
  return joinedArray;//end of Rot13 
}// Ceasar's Cipher

rot13("LBH QVQ VG!"); //should decode to YOU DID IT!
//rot13("SERR PBQR PNZC"); //should decode to FREE CODE CAMP
//rot13("SERR CVMMN!"); // should decode to FREE PIZZA!
//rot13("SERR YBIR?"); // should decode to FREE LOVE?
//rot13("GUR DHVPX OEBJA SBK WHZCF BIRE GUR YNML QBT."); //THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.