rps.js

var userInput = 'Rock'
userInput = userInput.toLowerCase();
function getComputerChoice() {
    var randomNumber = Math.floor(Math.random() * 3)
    switch (randomNumber){
        case 0:
            return 'rock'
        case 1:
            return 'paper'
        case 2:
            return 'scissors'
    }
}
function determineWinner (userChoice, computerChoice){
    if (userChoice === computerChoice){
        return 'The game was a tie!'
    }
    if (userChoice === 'rock'){
        if (computerChoice === 'paper'){
            return 'The computer won!'
        } else {
            return 'You won!'
        }
    }
    if (userChoice === 'paper'){
        if (computerChoice === 'scissors'){
            return 'The computer won!'
        } else {
            return "You won!"
        }
        if (userChoice === 'scissors'){
            if (computerChoice === 'rock'){
                return 'The computer won!'
            } else {
                return "You won!"
            }

        }
    }

}

function playGame() {
    var userChoice = userInput
    var computerChoice = getComputerChoice()
    console.log('You threw: ' + userChoice)
    console.log('The computer threw: ' + computerChoice)
    console.log(determineWinner(userChoice, computerChoice))
}

playGame();