Interview Q&A

Short answer: parameter to facilitate the state change.

Explain a bit more

public interface ITrafficLightState { void Change(TrafficLight light); } Each concrete state class (Red, Green, Yellow) will implement this interface, defining the specific behavior of the traffic light for that state. parameter to facilitate the state change. public interface ITrafficLightState { void Change(TrafficLight light); } Each concrete state class (Red, Green, Yellow) will implement this interface, defining the specific behavior of the traffic light for that state.

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.

Short answer: n update. public interface INewsPublisher { void Subscribe(IObserver observer); void Unsubscribe(IObserver observer); void Notify(string news); } n update. public interface INewsPublisher { void Subscribe(IObserver observer); void Unsubscribe(IObserver observer); void Notify(string news); } n update. public interface INewsPublisher { void… Subscribe(IObserver observer); void Unsubscribe(IObserver observer); void…

Explain a bit more

Notify(string news); } n update. public interface INewsPublisher { void Subscribe(IObserver observer); void Unsubscribe(IObserver observer); void Notify(string news); }

Real-world example (ShopNest)

When order status changes, observers update email, SMS, and analytics without the Order class knowing each one.

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.

Short answer: And Description() that every coffee component will implement.

Explain a bit more

public interface ICoffee { double Cost(); string Description(); } nd Description() that every coffee component will implement. public interface ICoffee { double Cost(); string Description(); } And Description() that every coffee component will implement. public interface ICoffee { double Cost(); string Description(); } nd Description() that every coffee component will implement. public interface ICoffee { double Cost(); string Description(); }

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.

Short answer: Subclasses, like PastaRecipe, implement the GatherIngredients, Prepare, and CookMethod methods. These methods contain the specific details of the recipe, such as the ingredients, preparation steps, and cooking process.

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.

Short answer: s a Build() method to return the fully constructed pizza. public interface IPizzaBuilder { void SetDough(string dough); void SetSauce(string sauce); void AddTopping(string topping); Pizza Build(); } s a Build() method to return the fully constructed pizza.

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.