Caretaker:?

Short answer: The Caretaker class manages the mementos. It’s responsible for saving and undoing changes to the TextEditor. The Save() method pushes the current state (memento) onto a stack. The Undo() method pops the most recent memento off the stack and restores the TextEditor to that state. public class Caretaker

Example code

{
private readonly Stack<TextMemento> _mementos = new Stack<TextMemento>(); public void Save(TextEditor editor) => _mementos.Push(editor.Save()); public void Undo(TextEditor editor)
{
if (_mementos.Count > 0)
{ editor.Restore(_mementos.Pop()); }
}
}

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.