What is the method to modify the behavior of an Emmeted value BehaviorSubject?

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To modify the behavior of an Emmeted value BehaviorSubject, you can use the .next() method to update the value of the subject. This will trigger the subscribers to get notified of the new value. Additionally, you can also use the .filter() method to filter out certain values emitted by the subject or the .map() method to transform the emitted values before notifying the subscribers.