Workshop › 15 Puzzle › Step 19 of 27

Is it solved?

What we are doing

isSolved() compares every square with the solved board. A shuffle could by chance end solved, so reset shuffles again while it is.

```js
function reset() {
  tiles = solvedTiles()
  do shuffle(200)
  while (isSolved())
  moves = 0
}

function isSolved() {
  return tiles.every((t, i) => t === solvedTiles()[i])
}
```

What it means

• every is true only if the test is true for every item; t is the tile and i its position.
• do ... while (isSolved()) shuffles first, then checks, and shuffles again as long as the board is solved.

Your turn

1. In reset, change shuffle(200) to do shuffle(200) and write while (isSolved()) under it.
2. Under reset, leave an empty line and write isSolved. Press Run.

Skills: Arrays and objects

← Which boards can be solved? Remember the slide →

All steps

1. A board in one list
2. The canvas and the pen
3. Paint the table
4. A function that draws
5. Row and column
6. Where each square is
7. Draw one tile
8. The number on the tile
9. All the tiles
10. Draw again and again
11. The solved board from N
12. Neighbours
13. Slide a tile
14. Click a tile
15. Arrow keys
16. Count the moves
17. Shuffle with real slides
18. Which boards can be solved?
19. Is it solved?
20. Remember the slide
21. Count the frames
22. Smooth sliding
23. Solved!
24. Show the win
25. Play again
26. A record to beat
27. Build it yourself: a timer