Object Form of Law of Demeter

Within a method, messages can only be sent to the following objects:

• 1. A parameter of the method, including the enclosing object (this or self);
  • 1.1. For pragmatic reasons: a global object;
• 2. An immediate part object (computed or stored):
  • 2.1 An object that a method called on the enclosing object returns, including attributes of the enclosing object;
  • 2.2 An element of a collection which is an attribute of the enclosing object;
• 3. An object created within the method.