Workshop › Sokoban › Step 5 of 29

A name for every tile

What we are doing

We will keep walls and goals in a Set, which compares simple values like text but not {x, y} objects. So each tile gets a text name: key(3, 2) is '3,2'.

```js
const key = (x, y) => x + ',' + y // one string per tile, so tiles can go in a Set
```

What it means

• (x, y) => ... is a short function (an arrow function) with two parameters; it gives back what is after the arrow.
• x + ',' + y glues the numbers and a comma into one text: key(3, 2) is '3,2'.

Your turn

Under the list's closing ], leave an empty line and write the key line. Press Run.

Skills: Functions

← A function that draws Read the walls →

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