Workshop › Sokoban › Step 13 of 29

One step

What we are doing

move(dx, dy) moves the player one tile: dx and dy say how far in each direction. A wall on the target tile blocks the step.

```js
function move(dx, dy) {
  const x = player.x + dx
  const y = player.y + dy
  if (walls.has(key(x, y))) return
  player = { x, y }
}
```

What it means

• x and y are the target tile.
• walls.has(key(x, y)) asks the Set whether there is a wall there; if so, return leaves at once.
• Otherwise the player moves there.

Your turn

Above function draw() {, write move and leave an empty line. Press Run.

Skills: Game states, Collision detection

← Two more levels Walk with the arrows →

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