Workshop › Missile Command-style Defense › Step 25 of 35

Waves

What we are doing

The game comes in waves. nextWave() starts the next one: a few more missiles each time, and a little more ammo. reset() starts from wave 0 and calls it.

```js
let wave

function nextWave() {
  wave += 1
  toLaunch = 8 + wave * 2
  launchIn = 30
  ammo = 12 + wave * 2
}

  wave = 0
  score = 0
  nextWave()
```

What it means

• nextWave adds 1 to wave and sets up that wave: 8 + wave * 2 missiles and 12 + wave * 2 interceptors.
• Wave 1 has 10 missiles and 14 ammo; wave 2 has 12 and 16.
• reset sets wave = 0, so its call to nextWave() starts wave 1.

Your turn

1. Above let toLaunch write let wave.
2. Above the // A new enemy missile ... comment, write nextWave, followed by an empty line.
3. In reset, replace the lines score = 0, toLaunch = 20, launchIn = 30, ammo = 14 with the three new lines.

Skills: Game states, Functions

← Limited ammo Each wave is harder →

All steps

1. Six cities to protect
2. Your missile base
3. Draw again and again
4. Cities that can fall
5. Rubble
6. Move towards a point
7. Launch an enemy missile
8. One missile a second
9. Missiles on their way
10. Smoke trails
11. Impact
12. Fire an interceptor
13. Click the sky
14. Interceptors fly
15. An explosion that grows and shrinks
16. Explode on arrival
17. Draw the explosions
18. Impacts explode too
19. Caught in the blast
20. Chain reactions
21. Only your explosions count
22. Points for every missile
23. Show the score
24. Limited ammo
25. Waves
26. Each wave is harder
27. The end of a wave
28. The end
29. Play again
30. Wave, ammo and messages
31. Launch from anywhere
32. Some missiles will split
33. Split into three
34. A high score
35. Build it yourself: a crosshair