The observer pattern is a software design pattern in which an object, named the subject, maintains a list of its dependents, called observers, and notifies them automatically of any state changes, usually by calling one of their methods.
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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