axax/esnext/zip.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 });
/**
 * Zips two iterables
 */
function zip(first) {
    return async function* inner(second) {
        const iterators = [first, second].map(value => value[Symbol.asyncIterator]());
        while (true) {
            const [firstNext, secondNext] = await Promise.all(iterators.map(iterator => iterator.next()));
            if (firstNext.done || secondNext.done) {
                return;
            }
            yield [firstNext.value, secondNext.value];
        }
    };
}
exports.zip = zip;