Workshop › Frogger-style Crossing › Step 15 of 22

Ride the log

What we are doing

A frog on a log moves with it. If the log carries it past the edge of the screen, that is a splash too.

```js
// The log carries the frog; being carried off the screen is a splash too.
frog.x += lane.speed
if (frog.x < -0.5 || frog.x > COLS - 0.5) die()
```

What it means

• Each frame the frog moves by the lane's speed, exactly like its log.
• Past half a square beyond either edge, the frog is lost.

Your turn

In update, under the log check, write the comment and the two lines.

Skills: Velocity and gravity

← Stay on the logs Back in line →

All steps

1. Road and river
2. The frog
3. Keep drawing
4. Hop
5. Swipe to hop
6. Lanes of traffic
7. Cars
8. Traffic moves
9. Hit by a car
10. Three lives
11. Play again
12. Tap to play again
13. Logs on the river
14. Stay on the logs
15. Ride the log
16. Back in line
17. Home slots
18. Get home
19. Points for progress
20. Next level
21. Best score
22. Build it yourself: a time limit