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I was wondering what the main difference is between the getValue function and the readonly value property on the BehaviorSubject? Is there a benefit of using one over the the other?
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So the only solution that I found to get the value of a BehaviorSubject was: let value; myBehaviorSubject. take(1). subscribe( (e) => value = e );
BehaviorSubject is both observer and type of observable. BehaviorSubject always need an initial/default value. Every observer on subscribe gets current value. Current value is either latest value emitted by source observable using next() method or initial/default value.
The BehaviorSubject There are two ways to get this last emited value. You can either get the value by accessing the . value property on the BehaviorSubject or you can subscribe to it. If you subscribe to it, the BehaviorSubject will directly emit the current value to the subscriber.
BehaviorSubject is a variant of a Subject which has a notion of the current value that it stores and emits to all new subscriptions. This current value is either the item most recently emitted by the source observable or a seed/default value if none has yet been emitted.
There is no difference between the two methods.
Internally the BehaviorSubject returns the value from getValue(). So if you are super picky about performance, then calling getValue() saves you one function call.
get value(): T {
return this.getValue();
}
https://github.com/ReactiveX/rxjs/blob/1d29fe8b903c0dbc2b74a5e68abb9270e3f45015/src/internal/BehaviorSubject.ts#L19
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