Function progress

src/pages/progress/Progress.js:11–19

()

  const [completed, setCompleted] = React.useState(0);
  React.useEffect(() => {
    function progress() {
      setCompleted((oldCompleted) => {
        if (oldCompleted === 100) {
          return 0;
        }
        const diff = Math.random() * 10;
        return Math.min(oldCompleted + diff, 100);
      });
    }
    const timer = setInterval(progress, 1500);
    return () => {
      clearInterval(timer);