onErrorReturn method
instructs an Observable to emit a particular item when it encounters an error, and then terminate normally
The onErrorReturn operator intercepts an onError notification from the source Observable. Instead of passing it through to any observers, it replaces it with a given item, and then terminates normally.
Example
new Observable.error(new Exception())
.onErrorReturn(1)
.listen(print); // prints 1
Implementation
Observable<T> onErrorReturn(T returnValue) =>
transform(new OnErrorResumeNextStreamTransformer<T>(
new Observable<T>.just(returnValue)));