Three parts of the Model View Presenter (MVP) pattern

• Model

Models are merely entry points for business logic and save the information because model has contained data. The aims of MVP is to increase the amount of code that could be tested through automation and tackles some concerns with the presentation layer by segregation business logic from the user interface.

• View 

The User Interface component such as jQuery, HTML and CSS are handled by View. The function is manages the properties of views and in charge of showing the data. The Presenter is dependable for interaction between Presenter and Presenter processes the request and applies the relevant logic before returning data to View for display on screen. So that, the view is responsible for displaying the data obtained from contoller and also converts the models into user interface.

• Presenter

The presenter receive data from the View to evaluate data with Model and returns the results to View once the processing is complete. They communicate woth one another by an interface although the View and Presenter are separate completely.

Benefits of MVP pattern

• Faster development process

A developer will be able to work on the view while another one will work on the controller at the same time because MVC architecture accelerates developmen in parellel. The result is the project will complete the project quicker than expected.

• Ability to offer multiple views

The model possible to build multiple views with the MVC model. Business logic and data are separated from the display and code duplucation is very limited.

• Supports asynchronous technique

The model possible to integrate the MVC architecture with all popular JavaScript framework meant that developer can use MVC architecture with site-specific browsers, PDF files and desktop widgets. Additionally, it also possible to have apps build to loads fast as MVC supports asynichronous technique.

• Modification does not influence the complete model

The user interface in the web application tends to change more even compared to the rules of the company. The developers keep making changes frequentlu such as fonts, screen layouts, color and adding device support for tablets or mobile phone.

• MVC model returns data without anykind of formatting

MVC returns the data without applying any formatting meant that the same components can be used and called for by using any interface.

• SEO friendly development platform

The model is possible to come up with SEO-friendly URLs which can be used to generate more visits to the app or site. The reason is because MVC design pattern offers support for web applications or web pages that are SEO (Search Engine Optimization) friendly.

Three parts of the Model View View-model (MVVM) pattern

• Model

The model layer of the MVVM architecture is identical to the model layer of the MVP paradigm in that it contains data that serves as a gateway the business logic. This is because the model layer is not directly linked to the view layer and the models can be reused in a variety of situations.

• View

The View layer is responsible for data display to relate many variable and actions in a customizable way in the MVVM design. This layer also sends the values to the ViewModel to help change the user interface view.

• ViewModel

The ViewModel contains all the information needed to display the view because it is the bottom layer that can finally ends the model layer and set up for available data. Moreover, numerous views can functionally share a single ViewModel that allow the same functionality to be used for a completely different design. It also makes data streams relavant to the View visible and serves as a link between the database and the view that contain all functionalities.

Benefits of MVVM pattern

• Maintainability

The model will become possible to get into smaller and focused parts of the codes and make changes easily due to the separation of different kinds of code in a cleaner manner. The reason is because it will help developer to get ahead with new releases quickly and stay agile.

• Testability

In case of MVVM architecture, each code is implemented in the proper manner, all the internal and external dependencies will stay remain form the code which contains the core logic of the application which were planning to test because each code remains granular. If the developers are planning to write unit tests against the core logic, it will become much easier.

• Extensibility

The model at times gets moxed with maintainability due to the increased granular pieces of code and separation boundaries. The developer have a better chance of getting model done if developer plan to reuse any of those parts. It also comes with the feature where developer can add new pieces of code or replace the existing ones which do similar work at some places within the structure of the architecture.

Comparing between MVP and MVVM

1. Observables are not needed in MVP as a presenter layer is in the architecture to display the developers' user interface. While, observables are needed for each User Interface component due to the absence of Presenter in MVVM.

2. In MVP, there is a tigh compling between view and presenter and a change in vieew affects the presenter's user interface. While, the view and view model are not tightly coupled and this helps the layers to work independently in each layer and to do the unit testing in MVVM.

3. In MVP, the user interface is used more and many interfaces make the architecture heavy. While, there is no user interface, and hence fewer interfaces are used in MVVM.

4. In MVP, business logic and user interface are separate and hence testing is done easily on the layers as separate and as integration testing. While, business logic and user interface is not separate which making testing difficult in MVVM.

5. Debugging is easy for MVP applications and it will not take much time to do the cimpiling using the architecture. While, debugging is not easy in MVVM due to the complex layering patterns and the architectural style.

6. The layers are separated in MVP and hence the fragments and activity classes are ensured to work in their own manner. While, layers are not separated in MVVM and hence the classes are not ensured to produce the expected output from the user.

7. New releases cannot be done easily in the MVP architecture and maintenance and availability cannot always be ensured in the architecture. While, new releases can be done easily in the MVVM architecture and maintenance of the layers are really appreciable.

8. In MVP, the logic and application lie in the business logic that is present in the Model layer and core testing cannot be done in this case. While, the logic and application lie in the MVVM architecture code which helos to do the testing at the core level.

9. In MVP, user interface and automation create troubles in the testingphase and it is better to fo their testingbefore going with core logic testing. While, the user interface does not enter into the phase of these layers and this helps to do the maintenance part by itself to the code in MVVM.

10. Various methods are available in the MVP architecture as the interface covers only a small part of interaction. While, different methods are not available as there are no interfaces to fragment the interactions of the MVVM achitecture.

11. MVP architecture does not go well with the android applications or software and has activities as fragments in each stage of the life cycle. While, MVVM architecture goes well with android applications and updates the software with the new patches in the system and helps the software to be up-to-date.

References

1. MVP vs MVVM. (2021). Retrieved from https://www.educba.com/mvp-vs-mvvm/.
2. MVP vs MVC vs MVVM - Choosing Web Architecture for your Project. (2021). Retreved from https://yourstory.com/mystory/mvp-vs-mvc-vs-mvvm/amp.