Workshop › Simon Says Colors › Step 9 of 27

The sequence to remember

What we are doing

The sequence is the list of pads the player must repeat. It starts empty; every round nextRound adds one random pad (0 to 3) to its end.

```js
let sequence = [] // the pads to repeat, growing by one every round

function nextRound() {
  sequence.push(Math.floor(Math.random() * 4))
}

nextRound()
requestAnimationFrame(loop)
```

What it means

• [] is an empty array; push adds an item to its end.
• Math.random() is a random number from 0 up to 1; times 4, rounded down, it is 0, 1, 2 or 3: a random pad.
• nextRound() at the bottom adds the first pad before the loop starts.

Your turn

1. Above let lit, write the sequence line.
2. Above function draw, write nextRound and an empty line.
3. At the very bottom, write nextRound() above requestAnimationFrame(loop).

Skills: Arrays and objects

← Draw again and again Show the round →

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