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/** PURE_IMPORTS_START .._operators_switchAll PURE_IMPORTS_END */
import { switchAll as higherOrder } from '../operators/switchAll';
/**
 * Converts a higher-order Observable into a first-order Observable by
 * subscribing to only the most recently emitted of those inner Observables.
 *
 * <span class="informal">Flattens an Observable-of-Observables by dropping the
 * previous inner Observable once a new one appears.</span>
 *
 * <img src="./img/switch.png" width="100%">
 *
 * `switch` subscribes to an Observable that emits Observables, also known as a
 * higher-order Observable. Each time it observes one of these emitted inner
 * Observables, the output Observable subscribes to the inner Observable and
 * begins emitting the items emitted by that. So far, it behaves
 * like {@link mergeAll}. However, when a new inner Observable is emitted,
 * `switch` unsubscribes from the earlier-emitted inner Observable and
 * subscribes to the new inner Observable and begins emitting items from it. It
 * continues to behave like this for subsequent inner Observables.
 *
 * @example <caption>Rerun an interval Observable on every click event</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * // Each click event is mapped to an Observable that ticks every second
 * var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000));
 * var switched = higherOrder.switch();
 * // The outcome is that `switched` is essentially a timer that restarts
 * // on every click. The interval Observables from older clicks do not merge
 * // with the current interval Observable.
 * switched.subscribe(x => console.log(x));
 *
 * @see {@link combineAll}
 * @see {@link concatAll}
 * @see {@link exhaust}
 * @see {@link mergeAll}
 * @see {@link switchMap}
 * @see {@link switchMapTo}
 * @see {@link zipAll}
 *
 * @return {Observable<T>} An Observable that emits the items emitted by the
 * Observable most recently emitted by the source Observable.
 * @method switch
 * @name switch
 * @owner Observable
 */
export function _switch() {
    return higherOrder()(this);
}
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