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node_modules/rxjs/_esm2015/operator/mergeScan.js

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+import { mergeScan as higherOrder } from '../operators/mergeScan';
+/**
+ * Applies an accumulator function over the source Observable where the
+ * accumulator function itself returns an Observable, then each intermediate
+ * Observable returned is merged into the output Observable.
+ *
+ * <span class="informal">It's like {@link scan}, but the Observables returned
+ * by the accumulator are merged into the outer Observable.</span>
+ *
+ * @example <caption>Count the number of click events</caption>
+ * const click$ = Rx.Observable.fromEvent(document, 'click');
+ * const one$ = click$.mapTo(1);
+ * const seed = 0;
+ * const count$ = one$.mergeScan((acc, one) => Rx.Observable.of(acc + one), seed);
+ * count$.subscribe(x => console.log(x));
+ *
+ * // Results:
+ * 1
+ * 2
+ * 3
+ * 4
+ * // ...and so on for each click
+ *
+ * @param {function(acc: R, value: T): Observable<R>} accumulator
+ * The accumulator function called on each source value.
+ * @param seed The initial accumulation value.
+ * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of
+ * input Observables being subscribed to concurrently.
+ * @return {Observable<R>} An observable of the accumulated values.
+ * @method mergeScan
+ * @owner Observable
+ */
+export function mergeScan(accumulator, seed, concurrent = Number.POSITIVE_INFINITY) {
+    return higherOrder(accumulator, seed, concurrent)(this);
+}
+//# sourceMappingURL=mergeScan.js.map