async flow with generators example

index.js

function* gen() {
	const previous = yield new Promise(resolve => setTimeout(() => resolve(1), 1000));

	yield new Promise(resolve => setTimeout(() => resolve(previous + 1), 1000));
}

async function flow(gen) {
	const iterator = gen();
	let result;

	while (true) {
		const d = iterator.next(result);
		if (d.done) break;

		result = await d.value;
	}

	return result;
}


flow(gen).then(console.log);