Description: The Memento pattern is a design pattern that allows an object to capture its internal state and store it externally so that it can be restored later. This pattern is particularly useful in situations where there is a need to undo or restore the state of an object without exposing its internal implementation. The Memento consists of three main components: the ‘Originator’, which is the object whose state is to be saved; the ‘Memento’, which is the object that stores the internal state of the Originator; and the ‘Caretaker’, which is responsible for holding the Memento and managing its lifecycle. This pattern promotes separation of concerns, allowing the Originator to focus on its core functionality while the Caretaker handles state management. Additionally, the Memento pattern is relevant in applications that require undo functionalities, such as text editors or design applications, where users may want to revert changes made. In JavaScript and other programming languages, implementing this pattern can be straightforward, using objects and functions to encapsulate state and restoration operations, enabling efficient state management within various types of applications.
