| /** PURE_IMPORTS_START .._operators_concatMapTo PURE_IMPORTS_END */ |
| import { concatMapTo as higherOrder } from '../operators/concatMapTo'; |
| /* tslint:enable:max-line-length */ |
| /** |
| * Projects each source value to the same Observable which is merged multiple |
| * times in a serialized fashion on the output Observable. |
| * |
| * <span class="informal">It's like {@link concatMap}, but maps each value |
| * always to the same inner Observable.</span> |
| * |
| * <img src="./img/concatMapTo.png" width="100%"> |
| * |
| * Maps each source value to the given Observable `innerObservable` regardless |
| * of the source value, and then flattens those resulting Observables into one |
| * single Observable, which is the output Observable. Each new `innerObservable` |
| * instance emitted on the output Observable is concatenated with the previous |
| * `innerObservable` instance. |
| * |
| * __Warning:__ if source values arrive endlessly and faster than their |
| * corresponding inner Observables can complete, it will result in memory issues |
| * as inner Observables amass in an unbounded buffer waiting for their turn to |
| * be subscribed to. |
| * |
| * Note: `concatMapTo` is equivalent to `mergeMapTo` with concurrency parameter |
| * set to `1`. |
| * |
| * @example <caption>For each click event, tick every second from 0 to 3, with no concurrency</caption> |
| * var clicks = Rx.Observable.fromEvent(document, 'click'); |
| * var result = clicks.concatMapTo(Rx.Observable.interval(1000).take(4)); |
| * result.subscribe(x => console.log(x)); |
| * |
| * // Results in the following: |
| * // (results are not concurrent) |
| * // For every click on the "document" it will emit values 0 to 3 spaced |
| * // on a 1000ms interval |
| * // one click = 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3 |
| * |
| * @see {@link concat} |
| * @see {@link concatAll} |
| * @see {@link concatMap} |
| * @see {@link mergeMapTo} |
| * @see {@link switchMapTo} |
| * |
| * @param {ObservableInput} innerObservable An Observable to replace each value from |
| * the source 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 |
| * @return {Observable} An observable of values merged together by joining the |
| * passed observable with itself, one after the other, for each value emitted |
| * from the source. |
| * @method concatMapTo |
| * @owner Observable |
| */ |
| export function concatMapTo(innerObservable, resultSelector) { |
| return higherOrder(innerObservable, resultSelector)(this); |
| } |
| //# sourceMappingURL=concatMapTo.js.map |
