What is Dependency Injection?
- A mechanism for managing dependencies between software components, such as libraries or services, that are required to run an application.
- A method of testing in which dependencies are replaced with mock objects to isolate the test subject from the rest of the system.
- A software design pattern in which objects are passed their dependencies, rather than being responsible for creating or finding them. This improves the flexibility and maintainability of the code by allowing dependencies to be swapped out or updated without affecting the objects that use them.
- A technique for structuring software components into a tree-like hierarchy to organize dependencies and reduce coupling between components.
Dependency Injection is a design pattern that allows an object to be decoupled from its dependencies. Instead of an object creating or finding its own dependencies, they are passed to it from the outside. This improves the flexibility and maintainability of the code by allowing dependencies to be swapped out or updated without affecting the objects that use them.
What is Unit Of Work?
- A design pattern that groups multiple database operations into a single transaction
- A mechanism for breaking down complex software systems into smaller, manageable pieces
- A software component that implements data access logic and encapsulates the underlying data storage
- An architectural pattern that allows decoupling of application components
Unit of Work is a design pattern that groups multiple database operations into a single transaction, ensuring that either all or none of the operations succeed.
What are the benefits of using Factory pattern?
- It allows the creation of objects without specifying the exact class of object that will be created
- It helps to reduce the number of objects in the system, making it more efficient
- It promotes the loose coupling between objects, making the system easier to maintain and extend
- It provides a clean and efficient implementation of the Object-Oriented principles
The benefits of using Factory pattern include promoting the loose coupling between objects, making the system easier to maintain and extend, and providing a clean and efficient implementation of the Object-Oriented principles. The Factory pattern helps to encapsulate the object creation process, making it easier to change the object creation logic in the future if necessary.
What is the purpose of the Null Object pattern?
- To create objects with complex behavior
- To define a default behavior for an object
- To replace null references with meaningful objects
- To validate user input
The Null Object pattern aims to replace null references with objects that have a defined behavior, avoiding runtime errors.
What is the difference between the Decorator and Proxy patterns?
- None of the above
- The Decorator and Proxy patterns are the same
- The Decorator pattern adds behavior to an object dynamically, while the Proxy pattern provides a substitute for an object to control access to it
- The Decorator pattern provides a substitute for an object to control access to it, while the Proxy pattern adds behavior to an object dynamically
The Decorator pattern adds behavior to an object dynamically, while the Proxy pattern provides a substitute for an object to control access to it
What is Proxy pattern?
- A design pattern that allows objects to represent or act on behalf of other objects, providing a level of indirection between the client and the target object
- A design pattern that creates objects by cloning existing objects, rather than creating new instances from scratch
- A design pattern that provides a simplified interface to a complex system, allowing the client to interact with the system through a single, unified interface
- A design pattern that uses shared objects to support large numbers of similar objects efficiently
Proxy pattern is a design pattern that allows objects to represent or act on behalf of other objects, providing a level of indirection between the client and the target object. The pattern involves creating a proxy class that acts as an intermediary between the client and the target object. This pattern can be useful in situations where you want to add additional functionality or control access to an object, without affecting the behavior of the target object.
What is Composite Entity pattern?
- A design pattern that promotes loose coupling by keeping the presentation layer separate from the business layer
- A design pattern that provides a simplified interface to a set of services
- A design pattern that separates the business logic and presentation logic in an application
- A design pattern used to represent entities that have a tree structure
Composite Entity pattern is used to represent entities that have a tree structure, such as an organizational chart.
What is Memento pattern?
- A design pattern that allows the client to traverse a collection of objects, without exposing the underlying representation of the collection
- A design pattern that captures the internal state of an object, allowing the object to be restored to this state later
- A design pattern that converts a request into a standalone object, allowing the client to parametrize objects with different requests, queue a request, or log requests
- A design pattern that provides a simplified interface to a complex system, allowing the client to interact with the system through a single, unified interface
The Memento pattern is a design pattern that captures the internal state of an object, allowing the object to be restored to this state later. The Memento pattern is used to capture and store the internal state of an object so that it can be restored at a later time, without violating the object's encapsulation. The Memento pattern is used to implement undo/redo functionality in applications.
What is the purpose of the Null Object pattern?
- To encapsulate complex operations and make them simple to use
- To handle requests or operations from clients
- To provide a substitute for a null reference
- To separate the representation of an object from its behavior
The Null Object pattern provides an object as a substitute for a null reference, avoiding the need for checking for null values.
What is Decorator pattern?
- A design pattern that allows objects to be decorated with additional responsibilities, dynamically, at runtime
- A design pattern that creates objects by cloning existing objects, rather than creating new instances from scratch
- A design pattern that filters a set of objects based on certain criteria and returns a subset of those objects
- A design pattern that separates an object's implementation from its interface, allowing the two to vary independently
Decorator pattern is a design pattern that allows objects to be decorated with additional responsibilities, dynamically, at runtime. The pattern involves creating a decorator class that wraps the original object, adding the new responsibilities to the original object's behavior. This pattern can be useful in situations where you want to add or remove responsibilities from objects dynamically, without affecting the behavior of the original objects.