Rosetta Stone: Observer Pattern

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Published on 2010-03-20T15:43:39Z Indexed on 2010/03/20 15:51 UTC
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How is the Observer Pattern expressed in various programming languages? Can you provide a code snippet that illustrates the major differences in each language. This post is intended to demonstrate the differences of this commonly used design pattern.

I will start this off with a Java example. Remember to start your answer off with the language being demonstrated.

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