@reactivex/ix-esnext-esm/iterable/flatmapasync.js

The Interactive Extensions for JavaScript

import { AsyncIterableX } from '../asynciterable';
import { bindCallback } from '../util/bindcallback';
class FlatMapAsyncIterable extends AsyncIterableX {
    constructor(source, selector) {
        super();
        this._source = source;
        this._selector = selector;
    }
    async *[Symbol.asyncIterator]() {
        for await (const outer of this._source) {
            for await (const inner of this._selector(outer)) {
                yield inner;
            }
        }
    }
}
/**
 * Projects each element of a sequence to a potentially async iterable and flattens the
 * resulting sequences into one sequence.
 * @param {Iterable<T | Promise<T>> | AsyncIterable<T>} source Source sequence
 * @param {function:(value: T): Iterable<R | Promise<R>> | AsyncIterable<R>} selector A transform function to apply to each element.
 * @param {Object} [thisArg] An optional "this" binding for the selector function.
 * @returns {AsyncIterable<R>} An async iterable whose elements are the result of invoking the one-to-many
 * transform function on each element of the input sequence.
 */
export function flatMapAsync(source, selector, thisArg) {
    return new FlatMapAsyncIterable(source, bindCallback(selector, thisArg, 1));
}

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