Rock, Paper, Scissors.js

const getUserChoice = userInput =>{
  userInput = userInput.toLowerCase()
  if (userInput === "rock" || userInput === "paper" || userInput === "scissors" || userInput === "bomb") {
    return userInput;
  } else {
    console.log("An error has occurred.");
  }
};

const getComputerChoice = () =>{
  switch (Math.floor(Math.random() * 2.99999)){
    case 0:
      return "rock"
      break;
    case 1:
      return "paper"
      break;
    case 2:
      return "scissors"
      break;
    default:
      return null
  }
}

const determineWinner = (userChoice, computerChoice) => {
  if (userChoice === computerChoice){
    return "The game is a tie.";
  } else if (userChoice === 'rock') {
    if (computerChoice === 'paper') {
      return "Computer wins.";
    } else {
      return "Player wins."
    }
  } else if (userChoice === 'paper') {
    if (computerChoice === 'scissors') {
      return "Computer wins.";
    } else {
      return "Player wins.";
    }
  } else if (userChoice === 'scissors') {
    if (computerChoice === 'rock') {
      return "Computer wins.";
    } else {
      return "Player wins.";
    }
  } else if (userChoice === 'bomb') {
    return "Player activated cheat codes; Player wins"
  }
}

const playGame = () => {
  let userChoice = getUserChoice('ROCK');
  let computerChoice = getComputerChoice();
  console.log(`You threw ${userChoice}.`)
  console.log(`Computer threw ${computerChoice}.`)
  console.log(determineWinner(userChoice, computerChoice))
}

playGame();