Section 3: Scenario-Based

Answer in your own words.

21. Explain when to use a struct instead of a class.

Answers

• The data is small and mutable.

• You want value-type behaviour (no reference sharing).

• Performance optimisation is needed for stack allocation.

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22. Why is readonly useful in Unity scripts?

Answers

• It ensures variables can only be set during initialisation.

• Prevents accidental modification after initialisation.

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23. How does static affect methods?

Answers

• Belong to the class rather tahn an instance.

• Can be accessed without created an object.

Example:

public static void PrintMessage() {
    Console.WriteLine("Hello");
}

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24. Why are events useful in Unity?

Answers

• They allow scripts to react dynamically to changes.

• Enable decoupling of code (e.g., handling game state changes).

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25. Explain inheritance in Unity.

Answers

• Reducing duplication.

• Allowing shared logic across multiple game objects.

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26. What are abstract classes, and when should you use them?

Answers

• Use them when you need a base class that should not be instantiated.

• Certain methods must be implemented by derived classes.

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27. When should you use a Dictionary instead of a List?

Answers

• When you need fast lookups based on a unique key.

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28. Explain polymorphism and its benefits.

Answers

• Polymorphism allows different objects to share the same inheritance but have unique behaviour.

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29. What is dependency injection, and why is it useful?

Answers

• It allows for better unit testing.

• Decouples objects from dependencies.

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30. What is a singleton pattern, and when should you use it?

Answers

• A singleton ensures only one instance of a class exists at runtime.

• Commonly used for GameManager in Unity.