Workshop › Mario-style Platformer › Step 16 of 37

Short hops

What we are doing

Good platformers let you choose the height: hold the button for a full jump, tap it for a short hop. When the button is released while still rising fast, the upward speed is cut to CUT.

```js
const CUT = -4 // letting go early caps the upward speed at this

function endJump() {
  if (player.vy < CUT) player.vy = CUT
}

  if (event.key === ' ' || event.key === 'ArrowUp') endJump()
```

What it means

• Rising faster than 4 means vy is below -4 (more negative); then it is set to -4.
• Falling, or rising slowly, is left alone.
• keyup of Space or up calls it.

Your turn

1. Under JUMP write CUT.
2. Under jump, leave an empty line and write endJump.
3. In the keyup listener, under keys[event.key] = false, write the endJump line.

Skills: Keyboard and mouse input, Velocity and gravity

← Bump your head A few frames of grace →

All steps

1. The sky
2. A level made of text
3. Draw the tiles
4. What is solid?
5. Is a box touching anything?
6. Find the start
7. Draw the player
8. Gravity
9. Landing on tiles
10. Which keys are held?
11. Speed up
12. Friction
13. Walls
14. Jump
15. Bump your head
16. Short hops
17. A few frames of grace
18. Coyote time
19. A camera that follows
20. Stop at the ends
21. Draw only what is on screen
22. Coins
23. Collect them
24. Count, and screen versus world
25. Enemies
26. Enemies that walk
27. Do not walk off ledges
28. Lives and a fresh start
29. Falling into a pit
30. Enemies hurt
31. Stomp!
32. Squashed enemies are gone
33. Game over
34. Play again
35. The flag
36. Reach the flag
37. Build it yourself: jump buffering