My Rock Paper Scissors Variation

rockPaperScissors.js

function getComputerChoice() {
 randomNumber = Math.floor(Math.random() * 3);
  switch (randomNumber) {
    case 0:
      return 'rock';
    case 1: 
      return 'paper';
    case 2: 
      return 'scissors';
       break;
  }
}

const getUserChoice = userInput => {
  userInput = userInput.toLowerCase();
  if (userInput === "rock" || userInput === "paper" || userInput === "scissors" || userInput === "slap") {
    return userInput;
  } else {
    console.log("Guess what, you managed to break the game. Hope you feel good.");
  }
};

function determineWinner(userChoice, computerChoice) {
  if (userChoice === "slap") {
     return "I can't believe you've just done that. You win!";
   } 
  if (userChoice === computerChoice) {
    return "The game is a tie.";
  } 
  if (userChoice === "rock") {
    	if (computerChoice === "paper") {
      return "The computer won. Sorry!";
    } else {
      return "You win! Congrats!";
    }
  }
 if (userChoice === "paper") {
   if (computerChoice === "scissors") {
      return "The computer won. Sorry!";
    } else {
      return "You win! Congrats!";
    }
   } 
 if (userChoice === "scissors") {
   if (computerChoice === "rock") {
      return "The computer won. Sorry!";
    } 
  else {
      return "You win! Congrats!";
    }
   } 
}

const playGame = () => {
  const userChoice = getUserChoice("slap");
  const computerChoice = getComputerChoice();
  console.log(`You threw: ${userChoice}`);
  console.log(`The computer threw: ${computerChoice}`);
  console.log(determineWinner(userChoice, computerChoice));
};

playGame();