axax/esnext/flatMap.js

A library of async iterator extensions for JavaScript including ```map```, ```reduce```, ```filter```, ```flatMap```, ```pipe``` and [more](https://github.com/jamiemccrindle/axax/blob/master/docs/API.md#functions).

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Go through the elements of an iterable and return zero or more of them using
 * an async iterable.
 *
 * @param mapper the mapper function to run over the async iterable
 */
function flatMap(mapper) {
    return async function* inner(source) {
        for await (const item of source) {
            for await (const nestedItem of mapper(item)) {
                yield nestedItem;
            }
        }
    };
}
exports.flatMap = flatMap;