PollingExample.js

const subscribeToPHoneData = async () => {
  // fetch the phones url
  const phones = await getData(PHONES_URL);
  const phoneAvailabilityCheck = setInterval(async () => {
    const { unavailableIds } = await getData(AVAILABILITY_URL);
    changePhonesStatus(phones, unavailable);
    // should return an object with the updated phone system
    /*
      if(someCondition) { clearInterval(phoneAvailabilityCheck) }
    */
  }, 1000);
};