Explain Clean Architecture, how it works?

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Accepted Answer

Clean Architecture is a software design principle that separates concerns and promotes testability, maintainability, and scalability.

Clean Architecture emphasizes separation of concerns by dividing the codebase into layers: Presentation, Domain, and Data.
Each layer has its own responsibilities and dependencies flow inward, ensuring loose coupling and high cohesion.
The Presentation layer handles user interactions and UI components.
The Domain layer contains business logic and use cases.
The Data layer deals with data access and external services.
Dependencies are inverted, with higher-level layers depending on lower-level layers.
This architecture enables easier testing, as each layer can be tested independently.
It also allows for easier maintenance and scalability, as changes in one layer do not affect others.
For example, an Android app using Clean Architecture would have separate packages for activities, view models, use cases, and data sources.

Accepted Answer

Clean Architecture Explanation

Explain Clean Architecture, how it works?

Clean Architecture is a software design principle that separates concerns and promotes testability, maintainability, and scalability.

Clean Architecture emphasizes separation of concerns by dividing th...read more

At its core, Clean Architecture promotes the separation of concerns and the creation of layers that are independent of each other. It does this by defining a set of rules and guidelines that help developers create software systems that are easy to understand, test, and modify.

The Clean Architecture consists of four layers: Entities, Use Cases, Interface Adapters, and Frameworks & Drivers. Each layer has a specific responsibility and is independent of the other layers. The four layers are arranged in a concentric circle, with Entities at the center, and the other layers arranged in a hierarchical order around it.

Entities: The Entities layer contains the business logic and domain model of the software system. This layer represents the core of the application and is independent of any external dependencies or frameworks.
Use Cases: The Use Cases layer contains the application-specific use cases and business rules. This layer defines the interactions between the Entities layer and the Interface Adapters layer.
Interface Adapters: The Interface Adapters layer provides the interface between the Use Cases layer and the outside world. This layer includes adapters that translate data from the outside world into a format that can be used by the Use Cases layer and vice versa. This layer also includes presenters that convert data from the Use Cases layer into a format that can be displayed by the user interface.
Frameworks & Drivers: The Frameworks & Drivers layer contains the external dependencies of the software system. This layer includes frameworks, libraries, and tools that the application uses to interact with the outside world.

Clean Architecture also defines a set of design principles and guidelines that developers should follow to create modular, testable, and maintainable software systems. These principles include:

Separation of concerns: Each layer of the architecture should have a clear and distinct responsibility.
Dependency inversion: High-level modules should not depend on low-level modules. Instead, both should depend on abstractions.
Dependency injection: Dependencies should be injected into classes, rather than being instantiated within the class.
Single Responsibility Principle (SRP): Each class or module should have only one responsibility.

By following these principles and guidelines, developers can create software systems that are flexible, maintainable, and scalable. Clean Architecture promotes a focus on the business logic of the application, rather than the technical details, making it easier to modify and maintain the system over time.

Explain Clean Architecture, how it works?

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