Workshop › Sokoban › Step 10 of 29

The boxes

What we are doing

Boxes move, so they are not keys in a Set but { x, y } objects in an array: $ and * each add one.

```js
let boxes

  boxes = []

      if (ch === '
  

 || ch === '*') boxes.push({ x, y })

  for (const box of boxes) tile(box.x, box.y, '#b45309', 6)
```

What it means

• boxes = [] starts an empty array on every load.
• boxes.push({ x, y }) adds a box object at the end. { x, y } is short for { x: x, y: y }.
• The loop draws each box in brown, inset by 6 pixels.

Your turn

1. Under let goals write let boxes.
2. In loadLevel, under goals = new Set() write boxes = []; under the goal if, write the box if.
3. In draw, under the goals loop, write the box line. Press Run.

Skills: Arrays and objects, Game states

← The goals The player →

All steps

1. A level written as text
2. The canvas and the pen
3. The warehouse floor
4. A function that draws
5. A name for every tile
6. Read the walls
7. Draw the walls
8. Center the level
9. The goals
10. The boxes
11. The player
12. Two more levels
13. One step
14. Walk with the arrows
15. Boxes are in the way
16. Push a box
17. A box on a goal turns green
18. Solved!
19. On to the next level
20. Which level?
21. A line at the bottom
22. Count the moves
23. A photo of the game
24. A photo before every move
25. Undo
26. Restart
27. A record for every level
28. Show the record
29. Build it yourself: count the pushes