Workshop › Rhythm Lanes › Step 3 of 35

Four lanes with a loop

What we are doing

Four lanes are the same drawing four times, each 70 pixels further right. A for loop repeats it for lane 0, 1, 2 and 3.

```js
for (let lane = 0; lane < LANES; lane++) {
  const x = LEFT + lane * LANE_W
  ctx.fillStyle = '#1e293b'
  ctx.fillRect(x + 2, 0, LANE_W - 4, canvas.height)
}
```

What it means

• for (let lane = 0; lane < LANES; lane++) runs its body with lane = 0, 1, 2, 3.
• x is where the lane starts: 60, 130, 200, 270.
• The body draws that lane, like before but at x.

Your turn

Replace the two lane lines at the end with the loop.

Skills: Loops

← The first lane The hit line →

All steps

1. A stage for the notes
2. The first lane
3. Four lanes with a loop
4. The hit line
5. A function that draws
6. The song as text
7. From text to notes
8. The clock decides where
9. Draw the notes
10. A clock that ticks
11. The game loop
12. Lanes that light up
13. Keys for the lanes
14. Show the keys
15. Hit the closest note
16. Close enough in time
17. One press, one hit
18. A message on the screen
19. Say Hit
20. Let the message go
21. Perfect or good
22. Keep count
23. Missed notes
24. Score
25. Hits in a row
26. The multiplier
27. The song ends
28. Stop the clock
29. Accuracy
30. The grade
31. The results
32. Play again
33. Best score
34. Lanes you can tap
35. Build it yourself: a speed setting