Rock, paper or scissors? A simple Javascript game.

rock-paper-scissors.js

const getUserChoice = userInput => {
  userInput = userInput.toLowerCase();
  	return userInput === 'rock' || userInput === 'paper' || userInput === 'scissors' ? userInput : console.log('Invalid input');
}

const getComputerChoice = () => {
  
  let whole = Math.floor(Math.random() * 3);
  switch( whole ) {
    case 0:
      return 'rock';
      break;
    case 1:
      return 'paper';
      break;
    default:
      return 'scissors';
      break;
  }
  
}

const determineWinner = (userChoice, computerChoice) => {
  
  if(userChoice === computerChoice) {
    return 'The game is a tie';
  }
  
  if(userChoice === 'bomb'){
    return 'Everything exploded, user wins.';
  }
  
  if(userChoice === 'rock') {
    if(computerChoice === 'paper') {
      return 'Computer won';
    } else {
      return 'User won';
    }
  }
  
  if(userChoice === 'paper') {
    if(computerChoice === 'scissors') {
      return 'Computer won';
    } else {
      return 'User won';
    }
  }
  
  if(userChoice === 'scissors') {
    if(computerChoice === 'rock') {
      return 'Computer won';
    } else {
      return 'User won';
    }
  }
  
}

const playGame = () => {
  let userChoice = getUserChoice('rock');
  console.log(userChoice);
  let computerChoice = getComputerChoice();
  console.log(computerChoice);
  console.log(determineWinner(userChoice, computerChoice));
}

playGame();