challenges.js

var scores, roundScore, activePlayer, gamePlaying;

init();

var lastDice;

document.querySelector('.btn-roll').addEventListener('click', function () {
    if (gamePlaying) {

        // random number
        var dice = Math.floor(Math.random() * 6) + 1;

        //display the result
        var diceDOM = document.querySelector('.dice');
        diceDOM.style.display = 'block';
        diceDOM.src = 'dice-' + dice + '.png';

        //update the round score if the rolled number is not a 1
        if (dice === 6 && lastDice === 6) {
            //player looses score
            scores[activePlayer] = 0;
            document.querySelector('#score-' + activePlayer).textContent = '0';
            nextPlayer();
        }else if (dice !== 1) {
            roundScore += dice;
            document.querySelector('#current-' + activePlayer).textContent = roundScore;
        } else {
            //next player
            nextPlayer();
        }
        lastDice = dice;
    }
});


document.querySelector('.btn-hold').addEventListener('click', function () {
    if (gamePlaying) {
        // Add current score to GLOBAl score
        scores[activePlayer] += roundScore;

        // update the UI

        document.querySelector('#score-' + activePlayer).textContent = scores[activePlayer];

        // check if the player won the game
        if (scores[activePlayer] >= 20) {
            document.querySelector('#name-' + activePlayer).textContent = "WINNER!";
            document.querySelector('.dice').style.display = 'none';
            document.querySelector('.player-' + activePlayer + '-panel').classList.add('winner');
            document.querySelector('.player-' + activePlayer + '-panel').classList.remove('active');
            gamePlaying = false;
        } else {
            //next player
            nextPlayer();

        }

    };
});

function nextPlayer() {
    activePlayer === 0 ? activePlayer = 1 : activePlayer = 0;
    roundScore = 0;

    document.getElementById('current-0').textContent = '0';
    document.getElementById('current-1').textContent = '0';

    document.querySelector('.player-0-panel').classList.toggle('active');
    document.querySelector('.player-1-panel').classList.toggle('active');

    document.querySelector('.dice').style.display = 'none';

};

document.querySelector('.btn-new').addEventListener('click', init);

function init() {
    scores = [0, 0];
    roundScore = 0;
    activePlayer = 0;
    gamePlaying = true;

    document.querySelector('.dice').style.display = 'none';

    document.getElementById('score-0').textContent = '0';
    document.getElementById('score-1').textContent = '0';
    document.getElementById('current-0').textContent = '0';
    document.getElementById('current-1').textContent = '0';
    document.getElementById('name-0').textContent = 'Player 1';
    document.getElementById('name-1').textContent = 'Player 2';
    document.querySelector('.player-0-panel').classList.remove('winner');
    document.querySelector('.player-1-panel').classList.remove('winner');
    document.querySelector('.player-0-panel').classList.remove('active');
    document.querySelector('.player-1-panel').classList.remove('active');
    document.querySelector('.player-0-panel').classList.add('active');


};