coding principles

Law of Demeter

The Law of Demeter (LoD), also known as the principle of least knowledge, states that a unit should only talk to its immediate friends — not to strangers. In practice this means an object's method should only call methods on: the object itself, its parameters, objects it creates, and its direct component objects. Chaining through multiple layers (a.getB().getC().doSomething()) creates tight coupling to the internal structure of collaborators, making refactoring difficult and fragile.