scan<S> method
inherited
Applies an accumulator function over an observable sequence and returns each intermediate result. The optional seed value is used as the initial accumulator value.
Example
new Observable.fromIterable([1, 2, 3])
.scan((acc, curr, i) => acc + curr, 0)
.listen(print); // prints 1, 3, 6
Implementation
Observable<S> scan<S>(S accumulator(S accumulated, T value, int index),
[S seed]) =>
transform(ScanStreamTransformer<T, S>(accumulator, seed));