JAVASCRIPT

usestate hook callback

const [counter, setCounter] = useState(0);

const doSomething = () => {
  setCounter(123);
}

useEffect(() => {
   console.log('Do something after counter has changed', counter);
}, [counter]);

useState hook with callback

const [state, setState] = useState(null);
const myCallbacksList = useRef([]);
const setStateWithCallback= (newState, callback) => {
  setState(state);
  if(callback) myCallbackList.current.push(callback)
}
useEffect(() => {
  myCallbacksList.current.forEach((callback) => callback())
  myCallbacksList.current = [];
}, [state]);
…
setStateWithCallback(newState, myCallback)