1 import { Observable } from '../Observable';
2 import { ObservableInput } from '../types';
3 import { from } from './from';
4 import { isArray } from '../util/isArray';
5 import { EMPTY } from './empty';
7 /* tslint:disable:max-line-length */
8 export function onErrorResumeNext<R>(v: ObservableInput<R>): Observable<R>;
9 export function onErrorResumeNext<T2, T3, R>(v2: ObservableInput<T2>, v3: ObservableInput<T3>): Observable<R>;
10 export function onErrorResumeNext<T2, T3, T4, R>(v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>): Observable<R>;
11 export function onErrorResumeNext<T2, T3, T4, T5, R>(v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>): Observable<R>;
12 export function onErrorResumeNext<T2, T3, T4, T5, T6, R>(v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>, v6: ObservableInput<T6>): Observable<R>;
14 export function onErrorResumeNext<R>(...observables: Array<ObservableInput<any> | ((...values: Array<any>) => R)>): Observable<R>;
15 export function onErrorResumeNext<R>(array: ObservableInput<any>[]): Observable<R>;
16 /* tslint:enable:max-line-length */
19 * When any of the provided Observable emits an complete or error notification, it immediately subscribes to the next one
22 * <span class="informal">Execute series of Observables no matter what, even if it means swallowing errors.</span>
24 * ![](onErrorResumeNext.png)
26 * `onErrorResumeNext` Will subscribe to each observable source it is provided, in order.
27 * If the source it's subscribed to emits an error or completes, it will move to the next source
30 * If `onErrorResumeNext` is provided no arguments, or a single, empty array, it will return {@link index/EMPTY}.
32 * `onErrorResumeNext` is basically {@link concat}, only it will continue, even if one of its
33 * sources emits an error.
35 * Note that there is no way to handle any errors thrown by sources via the result of
36 * `onErrorResumeNext`. If you want to handle errors thrown in any given source, you can
37 * always use the {@link catchError} operator on them before passing them into `onErrorResumeNext`.
40 * Subscribe to the next Observable after map fails</caption>
42 * import { onErrorResumeNext, of } from 'rxjs';
43 * import { map } from 'rxjs/operators';
46 * of(1, 2, 3, 0).pipe(
48 * if (x === 0) throw Error();
55 * val => console.log(val),
56 * err => console.log(err), // Will never be called.
57 * () => console.log('done'),
63 * // 3.3333333333333335
71 * @see {@link catchError}
73 * @param {...ObservableInput} sources Observables (or anything that *is* observable) passed either directly or as an array.
74 * @return {Observable} An Observable that concatenates all sources, one after the other,
75 * ignoring all errors, such that any error causes it to move on to the next source.
77 export function onErrorResumeNext<T, R>(...sources: Array<ObservableInput<any> |
78 Array<ObservableInput<any>> |
79 ((...values: Array<any>) => R)>): Observable<R> {
81 if (sources.length === 0) {
85 const [ first, ...remainder ] = sources;
87 if (sources.length === 1 && isArray(first)) {
88 return onErrorResumeNext(...first);
91 return new Observable(subscriber => {
92 const subNext = () => subscriber.add(
93 onErrorResumeNext(...remainder).subscribe(subscriber)
96 return from(first).subscribe({
97 next(value) { subscriber.next(value); },