Decorator pattern

In object-oriented programming, the decorator pattern is a design pattern that allows behavior to be added to an individual object, dynamically, without affecting the behavior of other instances of the same class.^[1] The decorator pattern is often useful for adhering to the Single Responsibility Principle, as it allows functionality to be divided between classes with unique areas of concern^[2] as well as to the Open-Closed Principle, by allowing the functionality of a class to be extended without being modified.^[3] Decorator use can be more efficient than subclassing, because an object's behavior can be augmented without defining an entirely new object.