Workshop › Missile Command-style Defense › Step 21 of 35

Only your explosions count

What we are doing

Only your explosions (and the chains they start) should destroy missiles. Each blast gets an own flag: true for interceptors and chains, false for impacts on the ground.

```js
let blasts // explosions: { x, y, age, own }: own ones destroy missiles, impacts on the ground do not

      blasts.push({ x: s.x, y: s.y, age: 0, own: true })

    if (blasts.some((b) => b.own && Math.hypot(m.x - b.x, m.y - b.y) <= radius(b))) {
      m.done = true
      blasts.push({ x: m.x, y: m.y, age: 0, own: true })

      blasts.push({ x: m.x, y: m.y, age: 0, own: false })
```

What it means

• Interceptor and chain blasts get own: true, ground impacts own: false.
• b.own && ...: only own blasts are checked; && stops at the first false part.

Your turn

Change the places shown: the let blasts comment, the interceptor's blast, the some check and the two missile blasts.

Skills: Collision detection, Game states

← Chain reactions Points for every missile →

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