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Observer-dispatch is a design pattern in software engineering that provides a way for objects to communicate with each other in a loosely coupled manner. In this pattern, objects called observers register themselves with an object called a subject or dispatcher. When an event occurs, the subject notifies all the registered observers without knowing any details about them.This pattern is useful when there are multiple objects that need to be notified of changes in another object's state, but we want to keep their dependencies minimal. It promotes modularity and flexibility in code.The observer-dispatch pattern is commonly used in user interface frameworks, where actions on one UI element can affect others. It also finds applications in event-driven systems, such as event sourcing and reactive programming.

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