Model-View-ViewModel (MVVM) Pattern

1. Introduction

The Model-View-ViewModel (MVVM) pattern is a software architectural pattern used primarily in modern UI development. It facilitates a clear separation of concerns, improving the maintainability and testability of code.

2. Key Concepts

• Model: Represents the data and business logic of the application.
• View: Represents the UI elements that display the data and receive user input.
• ViewModel: Acts as an intermediary between the Model and the View, handling the presentation logic.

3. MVVM Components

4. Implementation Steps

To implement the MVVM pattern, follow these steps:

1. Define the Model containing the business logic.

   class UserModel {
       constructor(name) {
           this.name = name;
       }
   }

2. Create the View using a framework like React or Angular.

   <div>Hello, {viewModel.user.name}</div>

3. Implement the ViewModel to bind data and commands.

   class UserViewModel {
       constructor(userModel) {
           this.user = userModel;
       }
   }

5. Best Practices

• Keep the ViewModel lightweight and focused on presentation logic.
• Use data binding to synchronize the View and ViewModel.
• Implement commands in the ViewModel to handle user actions.

6. FAQ