Undo Mechanism:?

Short answer: The TextEditor maintains a stack of executed commands. When the Undo() method is called, it pops the most recent command from the stack and calls its Undo() method, which reverts the action performed by the command (removes the last added text). Key Benefits of the Command Pattern:

Real-world example (ShopNest)

Use a GoF pattern in ShopNest only when it removes duplication or makes a change safer—explain the problem it solves in the interview.

Say this in the interview

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