http://www.mcdonaldland.info/files/designpatterns/designpatternscard.pdf https://refactoring.guru/design-patterns/structural-patterns
quiz time!
Convert the interface of a class into another interface clients expect
Decouple an abstraction from an implementation so the two can vary independently
Compose objects into tree structures to represent part-whole hierarchies
Attach additional responsibilities to an object dynamically
Provide a unified interface to a set of interfaces in a subsystem
Use sharing to support large numbers of fine-grained objects efficiently
Provide a surrogate or placeholder for another object to control access to it
X is a structural design pattern that allows objects with incompatible interfaces to collaborate.
X is a structural design pattern that lets you split a large class or a set of closely related classes into two separate hierarchies—abstraction and implementation—which can be developed independently of each other.