Decorator pattern

<p>In <a href="/facts/Object-oriented_programming/TxNMEcao">object-oriented programming</a>, the decorator pattern is a <a href="/facts/Design_pattern_(computer_science)/mV7r4egw">design pattern</a> that allows behavior to be added to an individual <a href="/facts/Object_(computer_science)/eX99dtAw">object</a>, dynamically, without affecting the behavior of other instances of the same <a href="/facts/Class_(computer_science)/zvzkSAtE">class</a>. The decorator pattern is often useful for adhering to the <a href="/facts/Single_responsibility_principle/6agMc10w">Single Responsibility Principle</a>, as it allows functionality to be divided between classes with unique areas of concern as well as to the <a href="/facts/Open-closed_principle/pCmLqrQL">Open-Closed Principle</a>, by allowing the functionality of a class to be extended without being modified. Decorator use can be more efficient than subclassing, because an object's behavior can be augmented without defining an entirely new object.
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Decorator pattern open-in-new

Decorator pattern