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The memento pattern is a software design pattern that exposes the private internal state of an object. One example of how this can be used is to restore an object to its previous state (undo via rollback), another is versioning, another is custom serialization.
With memento pattern the internal state of an object is stored. The object in which the state is saved, is called memento and is organized through the memento originator. This returns a memento, initialized with information of the current state, when undo is executed, so that the state can be checked. The memento is only visible for the originator.
Memento pattern: Allows for capturing and externalizing an object’s internal state so that it can be restored later, all without violating encapsulation. Observer pattern: Defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. State pattern
Memento pattern Provides the ability to restore an object to its previous state (rollback) Null object pattern Designed to act as a default value of an object Observer pattern a.k.a. Publish/Subscribe or Event Listener. Objects register to observe an event that may be raised by another object Weak reference pattern
Data abstraction is a design pattern in which data are visible only to semantically related functions, to prevent misuse. The success of data abstraction leads to frequent incorporation of data hiding as a design principle in object-oriented and pure functional programming.
Memento (2000) Memento is a psychological mystery with a mind-bending plot that has since become part of the Nolan directorial identity. The film follows Leonard, who suffers from short-term ...
One of the best gifts for dog lovers is a customized memento that celebrates their four-legged friend. ... as well, and the final product has a cute paw print pattern on the back and piped edges ...
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