State Transitions:?

Short answer: Each time the Change method is called, the current state will perform its action and then set the next state, allowing the traffic light to cycle through its states (Red → Green → Yellow → Red). Benefits of the State 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.