In MVC, controller is the entry point to the Application, while in MVVM, the view is the entry point to the Application. MVC Model component can be tested separately from the user, while MVVM is easy for separate unit testing, and code is event-driven .
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Quick Definition of MVVM Model represents the data and business logic of the app . One of the recommended implementation strategies of this layer, is to expose its data through observables to be decoupled completely from ViewModel or any other observer/consumer (This will be illustrated in our MVVM sample app below).
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