Workshop › Sudoku › Step 14 of 28

Solved!

What we are doing

The puzzle is solved when every cell is filled and nothing clashes. After each digit we check; once won, no more digits can be written.

```js
let won
  won = false

function checkWin() {
  for (let r = 0; r < 9; r++) for (let c = 0; c < 9; c++) if (grid[r][c] === 0 || conflict(r, c)) return
  won = true
}

function enter(d) {
  if (won || given[selected.r][selected.c]) return
  grid[selected.r][selected.c] = d
  checkWin()
}
```

What it means

• checkWin looks at all 81 cells and stops at the first empty or clashing one; if none, the puzzle is won.
• Two for loops and an if can be written on one line when each body is a single statement.

Your turn

1. Under let selected, write let won; in reset, set it to false.
2. Above enter, write checkWin; in enter, add won || and call checkWin().

Skills: Game states

← Show mistakes A clock →

All steps

1. Nine by nine
2. Lines and boxes
3. A puzzle from a string
4. The puzzle's own digits
5. Keep drawing
6. The selected cell
7. Light up row, column and box
8. The same digit everywhere
9. Click to select
10. Move with the arrows
11. Write digits
12. The three rules in one loop
13. Show mistakes
14. Solved!
15. A clock
16. The solved message
17. Play again
18. The easiest cell
19. The solver
20. Random order
21. Invent a puzzle
22. A new puzzle every game
23. Hints
24. Best time
25. N for a new puzzle
26. A number pad
27. Tap the pad
28. Build it yourself: undo