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node_modules/rxjs/_esm2015/operator/mergeMap.js

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+import { mergeMap as higherOrderMergeMap } from '../operators/mergeMap';
+/* tslint:enable:max-line-length */
+/**
+ * Projects each source value to an Observable which is merged in the output
+ * Observable.
+ *
+ * <span class="informal">Maps each value to an Observable, then flattens all of
+ * these inner Observables using {@link mergeAll}.</span>
+ *
+ * <img src="./img/mergeMap.png" width="100%">
+ *
+ * Returns an Observable that emits items based on applying a function that you
+ * supply to each item emitted by the source Observable, where that function
+ * returns an Observable, and then merging those resulting Observables and
+ * emitting the results of this merger.
+ *
+ * @example <caption>Map and flatten each letter to an Observable ticking every 1 second</caption>
+ * var letters = Rx.Observable.of('a', 'b', 'c');
+ * var result = letters.mergeMap(x =>
+ *   Rx.Observable.interval(1000).map(i => x+i)
+ * );
+ * result.subscribe(x => console.log(x));
+ *
+ * // Results in the following:
+ * // a0
+ * // b0
+ * // c0
+ * // a1
+ * // b1
+ * // c1
+ * // continues to list a,b,c with respective ascending integers
+ *
+ * @see {@link concatMap}
+ * @see {@link exhaustMap}
+ * @see {@link merge}
+ * @see {@link mergeAll}
+ * @see {@link mergeMapTo}
+ * @see {@link mergeScan}
+ * @see {@link switchMap}
+ *
+ * @param {function(value: T, ?index: number): ObservableInput} project A function
+ * that, when applied to an item emitted by the source Observable, returns an
+ * Observable.
+ * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
+ * A function to produce the value on the output Observable based on the values
+ * and the indices of the source (outer) emission and the inner Observable
+ * emission. The arguments passed to this function are:
+ * - `outerValue`: the value that came from the source
+ * - `innerValue`: the value that came from the projected Observable
+ * - `outerIndex`: the "index" of the value that came from the source
+ * - `innerIndex`: the "index" of the value from the projected Observable
+ * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
+ * Observables being subscribed to concurrently.
+ * @return {Observable} An Observable that emits the result of applying the
+ * projection function (and the optional `resultSelector`) to each item emitted
+ * by the source Observable and merging the results of the Observables obtained
+ * from this transformation.
+ * @method mergeMap
+ * @owner Observable
+ */
+export function mergeMap(project, resultSelector, concurrent = Number.POSITIVE_INFINITY) {
+    return higherOrderMergeMap(project, resultSelector, concurrent)(this);
+}
+//# sourceMappingURL=mergeMap.js.map