According to GoF definition, observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically . It is also referred to as the publish-subscribe pattern.
Read moreWhat is application state management?
Application state management is the process of maintaining knowledge of an application’s inputs across multiple related data flows that form a complete business transaction — or a session — to understand the condition of the app at any given moment.
Read moreWhat is Python program state?
State is a behavioral design pattern that allows an object to change the behavior when its internal state changes . The pattern extracts state-related behaviors into separate state classes and forces the original object to delegate the work to an instance of these classes, instead of acting on its own.
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