Function filterBehavior

Works like filter(), but always lets through the first emission for each new subscriber. This makes it suitable for subscribers that expect the observable to behave like a BehaviorSubject, where the first emission is processed synchronously during the call to subscribe().

source:                   |-false--true--false--true--false--true-|
filterBehavior(identity): |-false--true---------true---------true-|
filterBehavior(identity):        |-true---------true---------true-|
filterBehavior(identity):              |-false--true---------true-|
Copy