rax-use-interval

Why useInterval? setInterval will called even component is unmounted that make error happens, and useInterval will auto clearInterval before component will mount.

import { createElement } from 'rax';
import useInterval from 'rax-use-interval';

function Example() {
  const [count, setCount] = useState(0);
  useInterval(() => {
    setCount(count + 1);
  }, 1000);

  return <h1>{count}</h1>;
}

How to stop or restart timer?

function Example() {
  const [count, setCount] = useState(0);
  const [delay, setDelay] = useState(1000);
  useInterval(() => {
    setCount(count + 1);
  }, delay);

  const stopTimer = () => setDelay(null); // Stop
  const restartTimer = () => setDelay(1000); // Restart

  return <h1 onClick={delay ? stopTimer : restartTimer}>{count}</h1>;
}