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Eric Li
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Design Patterns in Ruby (Addison-Wesley Professional Ruby Series), by Russ Olsen

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the notify_observers method will not actually make any notifications if the changed flag is not set to true. Each call to notify_observers sets the changed flag back to false.
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Design Patterns in Ruby (Addison-Wesley Professional Ruby Series)
Design Patterns in Ruby (Addison-Wesley Professional Ruby Series)
by Russ Olsen
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