fetch async useEffect

useEffect(() => {
  isLoading = true;
  getData(someParam).then(data => {
    if (isLoading) {
      setState(data))
    }
  })
  return() => { isLoading = false }
}, [someParam]); // fetch only happens if param (like url) changes. Don't use objects.

Read More:

• Dan Abramov's thoughts on the issue

Future Improvements:

• Stop using isLoading booleans - Kent C. Dodds