The Three Most Common Design Patterns
Design patterns are a useful tool for software developers, providing established solutions to common programming problems. In this blog post, we will take a look at the three most popular and widely used design patterns: the model-view-controller (MVC) pattern, the singleton pattern, and the factory pattern. Each of these patterns offer their own unique advantages and can be adapted to fit specific needs. We’ll explore how these patterns can help you streamline your development process and create more robust, efficient code.
Model View Controller (MVC)
Model View Controller (MVC) is a software architecture pattern that separates an application into three main components: the model, the view, and the controller. The model component contains the data and logic of the application. The view component displays the data to the user in an appropriate format. Finally, the controller component handles requests from the user, which are then passed to the model and/or view components.
MVC provides a powerful and flexible way to build interactive applications. It allows for easier maintenance and upgrades since different components can be changed independently without affecting the other components. In addition, it also makes it easier to test an application because it separates out the business logic from the user interface.
MVC is used by many popular frameworks such as Ruby on Rails and AngularJS. In addition, many mobile app development frameworks such as iOS and Android make use of MVC principles. Therefore, understanding this design pattern is essential for any software developer.
Model View ViewModel (MVVM)
Model View ViewModel (MVVM) is a software architecture pattern that is used to separate the presentation layer from the business logic of an application. This pattern was created to make developing software easier by allowing developers to focus on the logic rather than on the user interface. The main purpose of this pattern is to provide a layer of abstraction that allows for easier code management, scalability, and maintenance.
The core elements of this pattern include the model, view, and viewmodel layers. The model layer holds the data and business logic for the application. The view layer is responsible for presenting the data in a form that can be seen and interacted with by users. Finally, the viewmodel layer acts as a bridge between the model and view layers, providing a layer of abstraction between them.
The MVVM pattern also makes use of data binding and messaging techniques. Data binding is used to sync the model and view layers by automatically updating changes made in one layer to the other. Messaging is used to send notifications between the different components of the system when certain events occur.
MVVM helps to keep your code clean, organized, and maintainable. It also allows for easier testing and debugging since it separates out different parts of the application into different components. Furthermore, it makes it easy to add features since you are only modifying the viewmodel layer rather than both the model and view layers.
Overall, Model View ViewModel (MVVM) is an effective way to create applications that are easy to maintain and extend. It also helps ensure that your code is organized and efficient, while making sure that changes made in one part of the system are quickly reflected in another part.
Presentation Model (PM)
The Presentation Model (PM) design pattern is a variant of the popular Model View Controller (MVC) pattern. In this pattern, the view component is replaced with a model that is responsible for presenting data to the user. This model is also known as the presentation layer, and it can be used to separate the application logic from the user interface.
The Presentation Model separates the view from the model, allowing for a more flexible application design. This separation of concerns allows developers to focus on creating different views for different devices, while keeping the same underlying model and business logic.
The Presentation Model can be used in a variety of situations, such as when building web applications or mobile applications. In addition, it is also useful when developing desktop applications. The presentation layer handles how information is presented to users, and the model is responsible for any data manipulation. By separating the two components, developers can create a single application that can be used across multiple platforms.
Using the Presentation Model pattern makes it easier to develop applications that are more resilient to changes in the user interface, while keeping the same underlying model and business logic. This makes it easier to maintain and update an application over time, as the view layer can be changed without affecting the underlying logic.
Ultimately, using the Presentation Model pattern is an effective way to develop applications that are more resilient to changes in the user interface and have a consistent structure across different platforms.