Workshop › Simon Says Colors › Step 16 of 27

Check each press

What we are doing

Now the player repeats the sequence. inputAt counts how far they have got, and every press is checked against that one step: a wrong pad ends the game ('over'), a right one moves on, and after the last step the next round starts.

```js
let inputAt // how many pads of the sequence the player has repeated

  inputAt = 0

function press(pad) {
  if (state !== 'input') return
  if (pad !== sequence[inputAt]) {
    state = 'over'
    return
  }
  inputAt += 1
  if (inputAt === sequence.length) nextRound()
}
```

What it means

• Presses only count in the player's turn.
• sequence[inputAt] is the pad expected now. A different pad ends the game.
• A right pad adds 1 to inputAt; when it equals the length, the whole sequence was repeated: nextRound() adds a pad and starts a new show (and sets inputAt back to 0).

Your turn

1. Change the comment of let state to include 'over', and under let timer write let inputAt.
2. At the end of nextRound, write inputAt = 0.
3. Under light, leave an empty line and write press.

Skills: Game states, Functions

← Watch, then your turn Play with the keyboard →

All steps

1. Get the canvas and the pen
2. A dark board
3. The first pad
4. Two colors for every pad
5. All four pads
6. A function that draws
7. Light a pad
8. Draw again and again
9. The sequence to remember
10. Show the round
11. Light a pad for a while
12. Go dark again
13. The computer shows a pad
14. Show the whole sequence
15. Watch, then your turn
16. Check each press
17. Play with the keyboard
18. Which pad is at a point?
19. Play with the mouse
20. Progress and mistakes
21. A function for a new game
22. Click to retry
23. Light up when pressed
24. Faster and faster
25. Save the best score
26. Show the best score
27. Build it yourself: no dawdling