Mid From PDF GoF Patterns Gang of Four Patterns

Multiple Undo Levels:?

Q: Multiple Undo Levels:?

Short answer: You can extend the pattern to support multiple levels of undo by adding more sophisticated memento management (e.g., limiting the number of mementos kept in memory or implementing a more efficient undo/redo system). Real-Time Use Case Examples: 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: You can extend the pattern to support multiple levels of undo by adding more sophisticated memento management (e.g., limiting the number of mementos kept in memory or implementing a more efficient undo/redo system). Real-Time Use Case Examples:

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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60–90 second framework

Define — one crisp sentence
Example — project or course app
Trade-off — what you gain vs sacrifice
Guardrail — test, monitor, or prevent failure

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Say your answer aloud, then check against the written answer above.

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