| import { Observable } from '../Observable'; |
| import { OperatorFunction, ObservedValueOf } from '../../internal/types'; |
| import { mergeMap } from './mergeMap'; |
| import { ObservableInput } from '../types'; |
| |
| /* tslint:disable:max-line-length */ |
| export function mergeMapTo<T, O extends ObservableInput<any>>(innerObservable: O, concurrent?: number): OperatorFunction<any, ObservedValueOf<O>>; |
| /** @deprecated */ |
| export function mergeMapTo<T, R, O extends ObservableInput<any>>(innerObservable: O, resultSelector: (outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R, concurrent?: number): OperatorFunction<T, R>; |
| /* tslint:enable:max-line-length */ |
| |
| /** |
| * Projects each source value to the same Observable which is merged multiple |
| * times in the output Observable. |
| * |
| * <span class="informal">It's like {@link mergeMap}, but maps each value always |
| * to the same inner Observable.</span> |
| * |
| * ![](mergeMapTo.png) |
| * |
| * Maps each source value to the given Observable `innerObservable` regardless |
| * of the source value, and then merges those resulting Observables into one |
| * single Observable, which is the output Observable. |
| * |
| * ## Example |
| * For each click event, start an interval Observable ticking every 1 second |
| * ```ts |
| * import { fromEvent, interval } from 'rxjs'; |
| * import { mergeMapTo } from 'rxjs/operators'; |
| * |
| * const clicks = fromEvent(document, 'click'); |
| * const result = clicks.pipe(mergeMapTo(interval(1000))); |
| * result.subscribe(x => console.log(x)); |
| * ``` |
| * |
| * @see {@link concatMapTo} |
| * @see {@link merge} |
| * @see {@link mergeAll} |
| * @see {@link mergeMap} |
| * @see {@link mergeScan} |
| * @see {@link switchMapTo} |
| * |
| * @param {ObservableInput} innerObservable An Observable to replace each value from |
| * the source Observable. |
| * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input |
| * Observables being subscribed to concurrently. |
| * @return {Observable} An Observable that emits items from the given |
| * `innerObservable` |
| * @method mergeMapTo |
| * @owner Observable |
| */ |
| export function mergeMapTo<T, R, O extends ObservableInput<any>>( |
| innerObservable: O, |
| resultSelector?: ((outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R) | number, |
| concurrent: number = Number.POSITIVE_INFINITY |
| ): OperatorFunction<T, ObservedValueOf<O>|R> { |
| if (typeof resultSelector === 'function') { |
| return mergeMap(() => innerObservable, resultSelector, concurrent); |
| } |
| if (typeof resultSelector === 'number') { |
| concurrent = resultSelector; |
| } |
| return mergeMap(() => innerObservable, concurrent); |
| } |