An ok time to use a nested for loop.

guessNotWinningWord

/* This code sample exemplifies an important aspect of your coding philosophy for many reasons.
* In most cases it's not a good idea to nest for loops.
* In this unique case it's ok because the object(s) being looped will always have a length of 4.
* My coding philosophy is similar to my life philosophy, everything depends on the event it's applied to.
* There are few hard and fast rules. Read the room and make a decision.
* Another way in which this code sample exemplifies my coding philosophy is that the function rewards the player for effort.
* This code is part of a game that asks the player to guess a four letter word. The player may receive points for wrong answers.
*
*
*/
const guessNotWinningWord = (currentGame, guessLowerCase) => {
  console.log(currentGame);
  let bulls = 0;
  let cows = 0;
  let winningWord = currentGame.winningWord;
  let guess = guessLowerCase;
  console.log(winningWord);
  // console.log(guess);
  let arr_guess = guess.split("");
  let arr_word = winningWord.split("");
  let message = `${guess} is NOT the Word`;
  let scored = 0;
  for (var i = 0; i < arr_guess.length; i++) {
    for (var j = 0; j < arr_word.length; j++) {
      if (arr_guess[i] === arr_word[j]) {
        if (i === j) {
          bulls++;
          scored += 100;
          arr_guess[i] = "0";
          arr_word[j] = "1";
        }
      }
      if (arr_guess[i] === arr_word[j]) {
        cows++;
        scored += 50;
        arr_guess[i] = "0";
        arr_word[j] = "1";
      }
    }
  }
  let userDidNotWinGame = {
    cows,
    bulls,
    guess,
    message,
    scored
  };
  // console.log(userDidNotWinGame);
  return userDidNotWin(userDidNotWinGame);
}