To start with, Model-View-Viewmodel, popularly known as MVVM pattern, is an advanced, modern structure of the MVC pattern. The main purpose, however remains the the same: provide a neat separation between the domain logic and the presentation layer.
The key benefit here is allowing a separation between the View and Model outside the limits of achieving separation and the efficiency. Hence, when you want to change the model, it can be changed seamlessly without the view needing to and vice-versa.
Here are the three major T’s of MVVM model architecture which makes it a great choice over Model View Presenter- MVP.
Tenacious
There is a neat separation of different kinds of code making it easier to get into one or more than one of those more pulverized and focused parts and make changes without worrying.
This provides a completely new dynamic to agile development; keep pushing out new releases quickly with utmost confidence.
The MVVM pattern presents a better separation of concerns, and this feature has been talked about widely across the development dynamic. This becomes possible with the addition of view models to the mix. The view model translates the data of the existing model layer into an object the view layer can use.
The controller is not responsible for this task.
When you click the “Save” button, an application resubmits all of the pre-existing data on the screen. Thus, MVVM streamlines this process by sending out only the required data. This gives a great boost to the performance.
Testable
In the MVVM architecture, every single piece of code is fine-tuned and if you manage to implement it correctly, the external and internal dependencies remain in separate pieces of code from the parts with the core logic to be tested
Ask a developer how easy it is to write unit tests against a core logic then.
Thorough
When working along MVVM architecture, you may notice that it sometimes juxtaposes with maintainability, since there are clean separation boundaries and comparatively granular pieces of code.
As a developer, there is greater chance that you would make any of those parts more reusable.
It also provides the ability to replace and/or add entirely new pieces of code that can do similar things into the right places of the architecture.
MVVM carries the tag of conducting abstraction of the View which greatly reduces the amount of business logic in code-behind.
Which in turn:
- Makes the ViewModel easier to unit test than the code-behind or event-driven code.
- Helps you test it without unsolicited UI automation and interaction.
- Allows the presentation layer and the logic to be loosely coupled.
The six radical fundamentals when using MVVM architecture
- The View is unaware of the controller it is owned by. A view simply knows how to present the data they are given to the user.
- The Controller stays unaware about the model. This is a major difference between MVC and MVVM.
- The Model is unaware of the View model it is owned by.
- The View model owns the Model. When you use the Model-View-Controller pattern, Model is owned by the Controller.
- View controller is the owner of the the View. The relationship remains unfazed when using the Model-View-ViewModel pattern.
- Finally, the controller is the owner of the ViewModel interacting with the model layer through multiple view models.
Conclusion
MVVM easily depicts the potential to become one of the most widely used, the most powerful architecture. Nothing is perfect, there will always be scope for improvement. The environment of MVVM application development has enormous space for new and better tasks that could place the world of application development on the pinnacle of success.
