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🔑Elements of Reusable Object-Oriented Software🔓is a software engineering book describing software design patterns. The book's authors are Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides with a foreword by Grady Booch.
A variant of the Flyweight pattern that allows the object to be modified without affecting other objects, and automatically shares the memory if the modified object is the same as other objects