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script.js
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script.js
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/// BlackJack
//Cards
let suits = ['Hearts', 'Clubs', 'Diamonds', 'Spades'];
let values = ['Ace', 'King', 'Queen', 'Jack',
'Ten', 'Nine', 'Eight', 'Seven',
'Six', 'Five', 'Four', 'Three', 'Two',];
//DOM Variables
let textArea = document.getElementById('txtArea'),
btnNewGame = document.getElementById('btnNewGame'),
btnHit = document.getElementById('btnHit'),
btnStay = document.getElementById('btnStay');
//Game Variables
let gameStarted = false,
gameOver = false,
playerWon = false,
dealerCards = [],
playerCards = [],
dealerScore = 0,
playerScore = 0,
deck = [];
btnHit.style.display = 'none';
btnStay.style.display = 'none';
showStatus();
btnNewGame.addEventListener('click', function()
{
gameStarted = true;
gameOver = false;
playerWon = false;
deck = createDeck();
shuffleDeck(deck);
dealerCards = [getNextCard(), getNextCard()];
playerCards = [getNextCard(), getNextCard()];
btnNewGame.style.display = 'none';
btnHit.style.display = 'inline';
btnStay.style.display = 'inline';
showStatus();
});
btnHit.addEventListener('click', function()
{
playerCards.push(getNextCard());
checkForEndOfGame();
showStatus();
});
btnStay.addEventListener('click', function()
{
gameOver = true;
checkForEndOfGame();
showStatus();
});
function createDeck()
{
let deck = [];
for(let suit = 0; suit < suits.length; suit++)
{
for(let value = 0; value < values.length; value++)
{
let card = {
suit: suits[suit],
value: values[value]
};
deck.push(card);
}
}
return deck;
}
function getCardNumericValue(card)
{
switch(card.value)
{
case 'Ace':
return 1;
case 'Two':
return 2;
case 'Three':
return 3;
case 'Four':
return 4;
case 'Five':
return 5;
case 'Six':
return 6;
case 'Seven':
return 7;
case 'Eight':
return 8;
case 'Nine':
return 9;
default:
return 10;
}
}
function getScore(cardArray)
{
let score = 0,
hasAce = false;
for (let i = 0; i < cardArray.length; i++)
{
let card = cardArray[i];
score += getCardNumericValue(card);
if(card.value === "Ace")
hasAce = true;
}
if(hasAce && score + 10 <= 21)
return score + 10;
return score;
}
function shuffleDeck(deck)
{
for(let i = 0; i < deck.length; i++)
{
let swap = Math.trunc(Math.random() * deck.length);
let tmp = deck[swap];
deck[swap] = deck[i];
deck[i] = tmp;
}
}
function getNextCard()
{
return deck.shift();
}
function getCardString(card)
{
return card.value + " of " + card.suit;
}
function updateScores()
{
dealerScore = getScore(dealerCards);
playerScore = getScore(playerCards);
}
function checkForEndOfGame()
{
updateScores();
if(gameOver)
{
while(dealerScore < playerScore && playerScore <= 21
&& dealerScore <= 21)
{
dealerCards.push(getNextCard());
updateScores();
}
}
if (playerScore > 21)
{
playerWon = false;
gameOver = true;
}
else if (dealerScore > 21)
{
playerWon = true;
gameOver = true;
}
else if (gameOver)
{
if(playerScore > dealerScore)
playerWon = true;
else
playerWon = false;
}
}
function showStatus()
{
if (!gameStarted)
{
textArea.innerText = "Welcome to Blackjack!";
return;
}
let dealerCardString = "";
for (let i = 0; i < dealerCards.length; i++)
{
dealerCardString += getCardString(dealerCards[i]) + "\n";
}
let playerCardString = "";
for (let i = 0; i < playerCards.length; i++)
{
playerCardString += getCardString(playerCards[i]) + "\n";
}
updateScores();
textArea.innerText =
"Dealer has:\n" +
dealerCardString +
"(score: " + dealerScore + ")\n\n" +
"Player has:\n" +
playerCardString +
"(score: " + playerScore + ")\n\n";
if(gameOver)
{
if(playerWon)
textArea.innerText += "YOU WON!";
else
textArea.innerText += "Dealer wins!";
btnNewGame.style.display = 'inline';
btnHit.style.display = 'none';
btnStay.style.display = 'none';
}
}