Workshop › Blackjack › Step 19 of 22

Double down

What we are doing

With your first two cards you may "double down": put in a second bet as big as the first, take exactly one more card, and stand. D is Double. It needs two cards and enough chips.

```js
// Double the bet, take exactly one more card, and stand.
function double() {
  if (phase !== 'player' || player.length !== 2 || bank < bet) return
  bank -= bet
  bet *= 2
  player.push(nextCard())
  if (handValue(player) > 21) finish()
  else stand()
}

  else if (button === 'Double') double()
```

What it means

• || joins the reasons to refuse: not your turn, not two cards, or not enough chips.
• The second bet leaves your chips, and bet doubles, so a win pays twice as much.

Your turn

1. Above finish, write double with its comment.
2. In press, handle Double after Stand.

Skills: Game states, Keyboard and mouse input

← Your record Long hands fit →

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