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Line 19: * [[Memento pattern]]: Provides the ability to restore an object to its previous state (rollback) * [[Null Object pattern]]: Designed to act as a default value of an object * [[Observer pattern]]: ~~aka~~a.k.a. Publish/Subscribe or Event Listener. Objects register to observe an event that may be raised by another object ** Weak reference pattern: De-couple an observer from an observable<ref>{{cite web \| first = Ashod

Behavioral pattern: Difference between revisions