Design Patterns: Observer and Publish-Subscribe

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Description

This is the fourth of an eight part series where Robert is joined by Phil Japikse to discuss design patterns. A design pattern is a best practice you can use in your code to solve a common problem.  In this episode, Phil demonstrates the Observer pattern. In this pattern, an object, called 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. Phil also compares the Observer pattern to the Publish-Subscribe pattern.

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