@lou.codes/iterables/dist/asynchronous/zip.js

🔁 Iterable and AsyncIterable utils

import { createIterableIterator } from "./createIterableIterator.js";
import { getIterator } from "./getIterator.js";
/**
 * Takes two iterables or asynchronous iterable and returns a new iterable or
 * asynchronous iterable with the length of the shortest iterable with tuples
 * containing the items from both.
 *
 * @category Asynchronous Generators
 * @example
 * ```typescript
 * const zipNumbers = zip([0, 1, 2]);
 * zipNumbers([3, 4, 5]); // [[0, 3], [1, 4], [2, 5]]
 * ```
 * @param iterableFirst One of the iterables to be zipped.
 * @returns Curried function with `iterableFirst` in context.
 */
export const zip = iterableFirst => iterableSecond =>
	createIterableIterator(async function* () {
		const asyncIteratorSecond = getIterator(iterableSecond);
		// eslint-disable-next-line functional/no-loop-statements
		for await (const itemFirst of iterableFirst) {
			const { done = false, value } = await asyncIteratorSecond.next();
			// eslint-disable-next-line functional/no-conditional-statements
			if (done) {
				break;
			}
			yield [itemFirst, value];
		}
	});