If you’re new to the world of software design patterns, this quiz is a great way to test your knowledge and understanding of the subject. Design patterns offer reusable solutions to commonly occurring problems in software design. Let’s see how well you know the basics.
1. Which design pattern is primarily concerned with creating objects?
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Explanation:
The Factory pattern deals with object creation, allowing an object to be created without specifying its concrete class.
2. The Singleton pattern ensures:
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Explanation:
Singleton ensures that a particular class has only one instance and provides a way to access that instance from any point in the app.
3. The Observer pattern is used when:
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Explanation:
The Observer pattern defines a one-to-many dependency where multiple observer objects are listening to one subject object.
4. Which pattern can be used to create a clone of an existing object?
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Explanation:
The Prototype pattern is used when creating an instance of a class from an existing instance (or prototype) by cloning.
5. Which design pattern helps you create complex objects step-by-step?
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Explanation:
The Builder pattern helps in building a complex object step by step.
6. Which design pattern turns a request into a stand-alone object?
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Explanation:
The Command pattern encapsulates a request as an object, thereby allowing for parameterization of clients with queues, requests, and operations.
7. Which design pattern promotes the loose coupling of a system?
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Explanation:
The Observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. This promotes loose coupling.
8. Which design pattern encapsulates an algorithm inside a class?
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Explanation:
The Strategy pattern defines a family of algorithms, encapsulates each one, and makes them interchangeable. Strategy lets the algorithm vary independently from clients that use it.
9. Which design pattern is used for creating an object clone?
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Explanation:
The Prototype pattern creates a new object by copying an existing object, known as the “prototype.”
10. What does the Factory Method pattern do?
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The Factory Method pattern defines an interface for creating an object, but allows subclasses to alter the type of objects that will be created.
11. Which design pattern provides a way to access the elements of an aggregate object?
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Explanation:
The Iterator pattern provides a way to access the elements of an aggregate object without exposing its underlying representation.
12. What is the main purpose of the Chain of Responsibility pattern?
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Explanation:
The Chain of Responsibility pattern passes the request along a chain of handlers, allowing multiple objects to handle the request.
13. Which design pattern is best for sharing state-sensitive resources?
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Explanation:
The Flyweight pattern minimizes memory usage or computational expenses by sharing as much as possible with related objects.
14. What does the Decorator pattern do?
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Explanation:
The Decorator pattern dynamically adds new functionality to an object without altering its structure.
15. Which pattern is used to structure subsystems and decouple them from the client?
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The Façade pattern provides a simplified interface to a group of subsystems, decoupling clients from the complex internals.
16. Which design pattern adds new functionality to an object without altering its structure?
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Explanation:
The Decorator pattern dynamically adds new functionality to an object without changing its structure.
17. What does the Bridge pattern aim to achieve?
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The Bridge pattern aims to decouple an abstraction from its implementation so that the two can vary independently.
18. What does the Proxy pattern do?
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The Proxy pattern provides a surrogate or placeholder for another object to control access to it.
19. Which design pattern composes objects into tree structures to represent part-whole hierarchies?
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The Composite pattern composes objects into tree structures to represent part-whole hierarchies, allowing clients to treat individual objects and compositions uniformly.
20. Which pattern provides a way to traverse a collection without exposing its underlying structure?
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Explanation:
The Iterator pattern provides a way to traverse a collection without exposing its underlying structure.
Whether you’re new to design patterns or brushing up on your knowledge, quizzes like this can help identify areas of strength and those that might need further study. Keep practicing and deepening your understanding of these essential software design tools!