Observer Design Pattern is a behavioral design pattern. We will explore the use cases, UML diagram and implementation in my current favorite programming language — Go.
The Observer design pattern is a fundamental tool for any capable software engineer. In one sentence, it consists of observers that pay close attention to subjects that change their state. In this tutorial, we will explore the use cases, UML diagram and implementation in my current favorite programming language — Go.
Note: The terminology can vary as an observer/subscriber or as a subject/topic/publisher. They are all the same, but I will be using observer and subjects in this article.
The real world examples of the observer design pattern are endless. They include:
And so many more!
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