switchScan
function stable
Applies an accumulator function over the source Observable where the accumulator function itself returns an Observable, emitting values only from the most recently returned Observable.
switchScan<T, R, O extends ObservableInput<any>>(accumulator: (acc: R, value: T, index: number) => O, seed: R): OperatorFunction<T, ObservedValueOf<O>>
Parameters
| accumulator | The accumulator function called on each source value. |
| seed | The initial accumulation value. |
Returns
OperatorFunction<T, ObservedValueOf<O>>: A function that returns an observable of the accumulated values.
Description
It's like scan, but only the most recent Observable returned by the accumulator is merged into the outer Observable.
See Also
© 2015–2021 Google, Inc., Netflix, Inc., Microsoft Corp. and contributors.
Code licensed under an Apache-2.0 License. Documentation licensed under CC BY 4.0.
https://rxjs.dev/api/operators/switchScan