plug in behaviors has-a
move behavior
attack behavior
defense behavior
Shield off
act
class Character one object
🛡️
hero
holds 3 behavior objects · no subclass
🏃 move —
⚔️ attack —
🛡️ defense —
with inheritance is-a
To cover every combination you'd need one subclass per combination:
3 × 3 × 2 = 18 subclasses
+ add an armor axis (×3) off
composition needs only
3 + 3 + 2 = 8 behavior objects
console
▸ One Character object holds swappable behaviors. Change a dropdown and the abilities update live — no new class. The right panel shows how many subclasses inheritance would need instead.