Workshop › Klondike Solitaire › Step 10 of 40

Put the piles on the table

What we are doing

Now draw goes through every pile and draws its cards: the top row at TOP_Y, the tableau columns lower, at TAB_Y. The test card goes away.

```js
const TOP_Y = 40 // the stock, the waste and the foundations
const TAB_Y = 136 // the seven tableau columns

  for (const [key, pile] of Object.entries(piles)) {
    const x = pileX(key)
    // The stock, the waste and the foundations only need their top card.
    const first = key[0] === 't' ? 0 : Math.max(0, pile.length - 1)
    for (let i = first; i < pile.length; i++) drawCardAt(pile[i], x, key[0] === 't' ? TAB_Y : TOP_Y)
  }
```

What it means

• Object.entries(piles) turns the object into a list of [name, pile] pairs; for (const [key, pile] of ...) runs once per pair, putting the name in key and the array in pile.
• first is where drawing starts: 0 for a column (every card), the last index for the other piles. Math.max(0, ...) keeps it from going below 0 for an empty pile.
• Every card of a column is drawn at the same TAB_Y for now.

Your turn

1. Under COL write TOP_Y and TAB_Y.
2. In draw, replace the test card line with the for loop. Press Run.

Skills: Drawing on a canvas, Loops

← A place for every pile Fan out the columns →

All steps

1. The green table
2. Draw one card
3. The face of a card
4. Red and black
5. A deck of 52
6. Shuffle
7. Piles in one object
8. Deal the seven columns
9. A place for every pile
10. Put the piles on the table
11. Fan out the columns
12. Outlines for empty places
13. Turn over a card
14. Space turns a card
15. Go through the stock again
16. What is under the pointer?
17. Hitting a card in a column
18. Tap the stock
19. Rule 1: building a column
20. Rule 2: building a foundation
21. Move cards by the rules
22. Turn over the uncovered card
23. Find where a card goes
24. Pick up a card
25. Tap to move
26. A move counter
27. Count the moves
28. Where did you grab it?
29. Follow the pointer
30. Draw the held cards at the pointer
31. Drop it where you want
32. Drop a king into an empty column
33. A clock
34. Winning
35. You won!
36. A new game
37. The best time
38. Snapshots of the table
39. Undo
40. Build it yourself: finish by itself