useFoo() — react Function Reference

Source Code

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-ref-prefix-postfix-operator.js lines 21–37

function useFoo() {
  const count = useRef(0);
  const updateCountPostfix = () => {
    const id = count.current++;
    return id;
  };
  const updateCountPrefix = () => {
    const id = ++count.current;
    return id;
  };
  useEffect(() => {
    const id = updateCountPostfix();
    console.log(`id = ${id}`);
    console.log(`count = ${count.current}`);
  }, []);
  return {count, updateCountPostfix, updateCountPrefix};
}