@reactivex/ix-esnext-esm/asynciterable/operators/flatmap.js

The Interactive Extensions for JavaScript

import { AsyncIterableX } from '../asynciterablex';
import { wrapWithAbort } from './withabort';
import { throwIfAborted } from '../../aborterror';
export class FlatMapAsyncIterable extends AsyncIterableX {
    constructor(source, selector, thisArg) {
        super();
        this._source = source;
        this._selector = selector;
        this._thisArg = thisArg;
    }
    async *[Symbol.asyncIterator](signal) {
        throwIfAborted(signal);
        const { _source: source, _selector: selector, _thisArg: thisArg } = this;
        let index = 0;
        for await (const outer of wrapWithAbort(source, signal)) {
            const inners = await selector.call(thisArg, outer, index++, signal);
            for await (const inner of wrapWithAbort(inners, signal)) {
                yield inner;
            }
        }
    }
}
/**
 * Projects each element of an async-iterable sequence to an async-iterable sequence and merges
 * the resulting async-iterable sequences into one async-iterable sequence.
 *
 * @export
 * @template TSource The type of the elements in the source sequence.
 * @template TResult The type of the elements in the projected inner sequences and the elements in the merged result sequence.
 * @param {((
 *     value: TSource,
 *     index: number,
 *     signal?: AbortSignal
 *   ) => AsyncIterable<TResult> | Promise<AsyncIterable<TResult>>)} selector A transform function to apply to each element.
 * @param {*} [thisArg] Option this for binding to the selector.
 * @returns {OperatorAsyncFunction<TSource, TResult>} An operator that creates an async-iterable sequence whose
 * elements are the result of invoking the one-to-many transform function on each element of the input sequence.
 */
export function flatMap(selector, thisArg) {
    return function flatMapOperatorFunction(source) {
        return new FlatMapAsyncIterable(source, selector, thisArg);
    };
}

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