Codecademy - Rock, paper, scissors

const getUserChoice = userInput => {
  userInput.toLowerCase()
    if(userInput === 'rock' || userInput === 'paper' || userInput === 'scissors'){
      return userInput;
    } else {
      console.log('Input error, choose rock, paper or scissors.');
    }
};

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

const determineWinner = (userChoice, computerChoice) => {
  if(userChoice === computerChoice){
    return 'The game was a tie!';
  }

  if(userChoice === 'rock'){
    if(computerChoice === 'paper'){
      return 'The computer won with paper!';
    } else {
      return 'The user won with rock!';
    }
  }

  if(userChoice === 'paper'){
    if(computerChoice === 'scissors'){
      return 'The computer won with scissors!';
    } else {
      return 'The user won with paper!';
    }
  }

  if(userChoice === 'scissors'){
    if(computerChoice === 'rock'){
      return 'The computer won with rock!';
    } else {
      return 'The user won with scissors!';
    }
  }
}

const playGame = (userChoice) => {
  userChoice = getUserChoice(userChoice);
  let computerChoice = getComputerChoice();
  console.log(`User is playing with: ${userChoice}\nComputer is playing with: ${computerChoice}`);
  console.log(determineWinner(userChoice, computerChoice));
}

playGame('rock');