How to design pattern using smalltalk in MVC

The Model/View/Controller set of classes are used to build user interfaces in Smalltalk-80. MVC consists of three kinds of objects. Model is the application object. View is the representation of the model and the Controller specifies how the user interface (View) reacts to the user input. Before MVC, these three objects (Model, View and Controller) used to be coupled together. MVC decouples model and view objects using the subscribe/notify protocol. Whenever the data in the model changes, it has to notify the associated views. In response, each view gets a chance to update itself. This allows add or create views

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How to design pattern using smalltalk in MVC
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