favBeerGenerator.js

function* favBeer() {
  const reply = yield "What is your favorite type of beer?";
  console.log(reply);
  if (reply !== "ipa") return "No soup for you!";
  return "OK, soup.";
}

{
  const it = favBeer();
  const q = it.next().value; // Iterator asks question
  console.log(q);
  const a = it.next("lager").value; // Question is answered
  console.log(a);
}

// What is your favorite beer?
// lager
// No soup for you!

{
  const it = favBeer();
  const q = it.next().value; // Iterator asks question
  console.log(q);
  const a = it.next("ipa").value; // Question is answered
  console.log(a);
}

// What is your favorite been?
// ipa
// OK, soup.

https://gist.github.com/btg5679/ffe53b3522abeb49ac11ea9844890899#file-favbeergenerator-js-L28
been