Mid From PDF GoF Patterns Gang of Four Patterns

Spreadsheet Software:?

Q: Spreadsheet Software:?

Short answer: Spreadsheet applications like Excel often use the Memento Pattern to save different states of a spreadsheet, enabling the user to undo changes like deleting a cell or modifying a formula. Explain a bit more Visual Diagram: +----------------+ +--------------------+ | TextEditor | Save() | TextMemento | | (Originator) |------------>| (Memento) | +----------------+ +--------------------+ | ^ Write Text Restore | | v | +----------------+ +--------------------+ | Caretaker |<------------| TextMemento | | (History) | Undo() | (Memento) | +----------------+ +--------------------+ Conclusion: The Memento Pattern is a powerful design pattern for handling state restoration in software systems, especially when implementing undo functionality. Say this in the interview Define — one clear sentence (the short answer above). Example — relate it to a project like ShopNest or your real work. Trade-off — when you would not use it.

Short answer: Spreadsheet applications like Excel often use the Memento Pattern to save different states of a spreadsheet, enabling the user to undo changes like deleting a cell or modifying a formula.

Explain a bit more

Visual Diagram: +----------------+ +--------------------+ | TextEditor | Save() | TextMemento | | (Originator) |------------>| (Memento) | +----------------+ +--------------------+ | ^ Write Text Restore | | v | +----------------+ +--------------------+ | Caretaker |<------------| TextMemento | | (History) | Undo() | (Memento) | +----------------+ +--------------------+ Conclusion: The Memento Pattern is a powerful design pattern for handling state restoration in software systems, especially when implementing undo functionality.

Say this in the interview

Define — one clear sentence (the short answer above).
Example — relate it to a project like ShopNest or your real work.
Trade-off — when you would not use it.

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