Law of Demeter

Also called “Principle of Least Knowledge”, it states:

In Practice

• Avoid chaining calls deep into the internals of other objects.
• Restrict communication to objects you directly manage.

🔹 ❌ Bad Example (Violation)

// Controller
total = order.customer.address.getRegionTaxRate() * order.amount

🔹 ✅ Good Example

// Controller
total = order.calculateTotal()

🔹 Why It Matters

• Reduces coupling → fewer dependencies between classes.
• Increases maintainability → changes in one class don’t affect distant classes.
• Improves readability → clear boundaries of responsibility.

🔹 Resources