Coupling

Reducing Object Graph Coupling with the Law of Demeter

A small change to an object model can cause surprising edits far away from the changed class. A developer moves an address under a customer profile, for example, and code in pricing, notifications, and reporting all breaks because each caller navigates the same chain of objects. The immediate problem looks like missing properties. The deeper problem is that those callers know the shape of an object graph they do not own.