Workshop › Blackjack › Step 17 of 22

Blackjack!

What we are doing

An ace and a ten-card as your first two cards is a "blackjack", the best hand. It ends the round at once and pays two and a half times the bet. If the dealer has one instead, you lose at once; if both do, it's a push.

```js
const isBlackjack = (hand) => hand.length === 2 && handValue(hand) === 21

  if (isBlackjack(player) || isBlackjack(dealer)) finish()

  if (isBlackjack(player) && isBlackjack(dealer)) [message, paid] = ['Both blackjack: push', bet]
  else if (isBlackjack(player)) [message, paid] = ['Blackjack!', bet * 2.5]
  else if (isBlackjack(dealer)) message = 'Dealer blackjack'
  else if (p > 21) message = 'Bust!'
```

What it means

• Only two cards count: 21 made with three cards is good, but not a blackjack.
• The deal checks both hands right away, before anyone plays.
• The blackjack checks come first in finish, so they beat an ordinary 21.

Your turn

1. Above deal, write isBlackjack.
2. At the end of deal, finish at once on a blackjack.
3. In finish, put the three blackjack checks first, and turn the bust if into else if.

Skills: Game states

← The next round Your record →

All steps

1. Cards
2. A deck
3. Shuffle
4. Deal
5. Cards on the table
6. Card faces
7. Keep drawing
8. What is a hand worth?
9. Aces: 11 or 1
10. Hit: one more card
11. Stand
12. The hidden card
13. Chips
14. Who wins?
15. The dealer's turn
16. The next round
17. Blackjack!
18. Your record
19. Double down
20. Long hands fit
21. Buttons
22. Build it yourself: six decks