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The observer design pattern enables a subscriber to register with and receive notifications from a provider.
The observer javascript design pattern is a powerful tool for creating manageable code and powerful action-based applications without hassle.
Observer design pattern (also known as dependants and publish-subscribe) is a behavioral pattern.
This is another post regarding design patterns.
Speaking on the observer pattern how can you use the observer pattern in your java design? by tony sintes, javaworld.