Workshop › Minesweeper › Step 8 of 26

Count the mines around

What we are doing

Each cell counts its mine neighbours once, right after the mines are placed, so the numbers never have to be worked out again.

```js
  Array.from({ length: SIZE }, (_, col) => ({ row, col, mine: false, count: 0 })),

for (const cell of grid.flat()) cell.count = neighbors(cell).filter((n) => n.mine).length
```

What it means

• Every cell starts with count: 0.
• For each cell, filter keeps the neighbours that are mines, and .length is how many there are.

Your turn

1. In newGame, add count: 0 to the cell object.
2. At the end of placeMines, write the counting line. Press Run.

Skills: Arrays and objects

← Shuffle the candidates Open a cell →

All steps

1. A grid of cell objects
2. The canvas and the pen
3. Draw the field
4. Draw every frame
5. Neighbours
6. Mines, but not under the first click
7. Shuffle the candidates
8. Count the mines around
9. Open a cell
10. Open cells look different
11. Coloured numbers
12. Click to open
13. Stepping on a mine
14. Show the mines
15. Flood fill
16. Flags with the right button
17. A flag protects its cell
18. Draw the flags
19. Mines left
20. Winning
21. The end and a new game
22. What time is it?
23. The clock
24. Stop the clock
25. The best time
26. Build it yourself: wrong flags