[ta-edu-course-survival-game] Chapter 2 — Composition vs Inheritance (2)

_Instructions.md

• Remove all references to Achievements from InteractableItem
• Create InteractableAchievement.cs
  • Let's see if we can lean into inheritance and create a hierarchy that'll help us untangle this code
• Add an Achievements field called "Achievements"
• Add a string field called "Identifier"
• Add a call to Achievements.Track(Identifier) to Interact()
• Make InteractableItem inherit InteractableAchievement
  • Okay, that's much better
  • We've decoupled our code so that items and achievements don't have to know about each other
  • But what happens if we need to notify another system?
    • Let's pretend that we have to notify some sort of an item respawn system
    • Do we keep building this hierarchy?
    • If so, what order should the hierarchy be in?

Interactable.cs

public abstract class Interactable : MonoBehaviour
{
  public abstract void Interact();
}

InteractableAchievement.cs

public class InteractableAchievement : Interactable
{
  public Achievements Achievements;
  public string Identifier;
  
  public void Interact()
  {
    Achievements.Track(Identifier);
  }
}

InteractableItem.cs

public class InteractableItem : InteractableAchievement
{
  public Inventory Inventory;
  public string Item;
  
  public void Interact()
  {
    Inventory.Add(Item);
  }
}