What is the difference between the Service Locator and Dependency Injection patterns?
- Service Locator is a centralized object that provides access to dependencies, while Dependency Injection provides objects to dependencies directly.
- Service Locator is a client-side pattern, while Dependency Injection is a server-side pattern.
- Service Locator is a dynamic method of object creation, while Dependency Injection is a static method of object creation.
- Service Locator is used to manage the lifecycle of objects, while Dependency Injection is used to manage the dependencies of objects.
The Service Locator pattern involves a centralized object that provides access to dependencies, while Dependency Injection provides objects to dependencies through constructor injection, method injection, or setter injection.
What is Builder pattern?
- A design pattern that allows the creation of objects without specifying the exact class of object that will be created
- A design pattern that helps to create objects in a step-by-step manner, allowing for more control over the object creation process
- A design pattern that helps to reduce the number of objects in the system, making it more efficient
- A design pattern that promotes the loose coupling between objects, making the system easier to maintain and extend
Builder pattern is a design pattern that helps to create objects in a step-by-step manner, allowing for more control over the object creation process. This pattern separates the construction of a complex object from its representation, allowing for the same construction process to create different representations.
What is the MVC pattern?
- A behavioral design pattern that lets you pass requests along a dynamic chain of receivers until one of them handles it.
- A creational design pattern that uses factory methods to deal with the problem of creating objects without specifying the exact class of object that will be created.
- A software architecture pattern that separates the representation of information from the user's interaction with it. The pattern defines three main components: the Model, the View, and the Controller.
- A structural design pattern that allows you to compose objects into tree structures to represent part-whole hierarchies.
A software architecture pattern that separates the representation of information from the user's interaction with it. The pattern defines three main components: the Model, the View, and the Controller.
What is the purpose of the Memento pattern?
- To create complex objects step by step, using a builder object to abstract the process of creating the object
- To provide a common interface for a group of related classes
- To provide a mechanism for saving and restoring an object's internal state without violating encapsulation
- To provide a simplified interface to a complex system, hiding the complexity of the system behind a single interface
The Memento pattern provides a mechanism for saving and restoring an object's internal state without violating encapsulation
Explain difference between the Facade, Proxy, Adapter and Decorator design patterns?
- The Facade design pattern provides a simplified interface to a complex system, while the Proxy design pattern provides a placeholder for another object to control access to it. The Adapter design pattern converts the interface of a class into another interface that the client expects, and the Decorator design pattern adds behavior to an individual object, dynamically, without affecting the behavior of other objects from the same class.
- The Facade design pattern provides a unified interface to a set of interfaces in a system, while the Proxy design pattern provides a way to access an object indirectly. The Adapter design pattern adapts an object to a new interface, and the Decorator design pattern adds behavior to an individual object, dynamically, but affects the behavior of other objects from the same class.
- The Facade design pattern provides a way to access a system's functionality, while the Proxy design pattern provides a way to extend an object's functionality. The Adapter design pattern converts the interface of one class into that of another, and the Decorator design pattern adds behavior to an individual object, statically, and affects the behavior of other objects from the same class.
- The Facade design pattern provides an intermediary between two systems, while the Proxy design pattern provides a default implementation of an interface. The Adapter design pattern is used to allow two systems to work together, and the Decorator design pattern adds behavior to an object, statically, without affecting the behavior of other objects from the same class.
The Facade design pattern provides a simplified interface to a complex system, while the Proxy design pattern provides a placeholder for another object to control access to it. The Adapter design pattern converts the interface of a class into another interface that the client expects, and the Decorator design pattern adds behavior to an individual object, dynamically, without affecting the behavior of other objects from the same class.
What is a pattern?
- A recurring solution to a common problem in a specific context. Patterns can be used in many different fields, including software development, architecture, and design.
- A sequence of actions or behaviors that are repeated in a particular situation.
- A set of coding conventions that must be followed when developing software to ensure consistency and readability.
- A specific arrangement or design that is repeated in a work of art or architecture.
A pattern is a general, reusable solution to a commonly occurring problem in a specific context. In software development, patterns are often used to solve design problems and improve the quality and maintainability of code.
Describe what is the Event Sourcing Pattern
- A database pattern that tracks changes to data over time.
- A design pattern that stores the history of an object's state changes.
- A pattern used to store events in a database.
- An architectural pattern that saves every state change of an application as an event.
Event Sourcing is a way of modeling the state changes of an application as a sequence of events, allowing us to persist these events as they occur. The events are stored in an event store, and can be used to reconstruct the state of the application at any point in time.
What is the purpose of the Template pattern?
- To create complex objects step by step, using a builder object to abstract the process of creating the object
- To define the basic steps of an algorithm and allow subclasses to provide concrete implementations for these steps
- To provide a common interface for a group of related classes
- To provide a simplified interface to a complex system, hiding the complexity of the system behind a single interface
The Template pattern defines the basic steps of an algorithm and allows subclasses to provide concrete implementations for these steps
What is the purpose of the Adapter pattern?
- To allow for loose coupling between the sender of a request and its receivers.
- To convert the interface of a class into another interface clients expect.
- To create objects based on a blueprint.
- To provide a unified interface to a set of interfaces in a subsystem.
The Adapter pattern is used to convert the interface of a class into another interface clients expect, allowing classes to work together that couldn't otherwise because of incompatible interfaces.
How is Bridge pattern different from Adapter pattern?
- The Bridge pattern aims to change the interface of an object while the Adapter pattern aims to reuse an existing object.
- The Bridge pattern allows for multiple inheritance while the Adapter pattern only allows for single inheritance.
- The Bridge pattern decouples an abstraction from its implementation while the Adapter pattern modifies the interface of an existing class to a client class.
- The Bridge pattern is a structural pattern while the Adapter pattern is a behavioral pattern.
The Bridge pattern decouples an abstraction from its implementation while the Adapter pattern modifies the interface of an existing class to a client class.