Debugging Data Update Issues with useEffect

Provide an example of how to use React's useEffect hook to troubleshoot and resolve issues related to chart data not updating correctly when the data source changes.

const [chartData, setChartData] = useState([]);

Initialize state to hold the chart data.

useEffect(() => {
  const fetchData = async () => {
    try {
      // Substitute URL with actual data source
      const response = await fetch('https://api.example.com/data');
      const data = await response.json();
      setChartData(data);
    } catch (error) {
      console.error('Error fetching data:', error);
    }
  };
  fetchData();
}, []);

Fetch data when the component mounts. The empty dependency array ensures this effect runs only once.

useEffect(() => {
  const updateChart = () => {
    // Update chart logic here
    // This could involve setting new options or updating the dataset
    console.log('Chart data updated', chartData);
  };
  if (chartData.length > 0) updateChart();
}, [chartData]);

This useEffect listens for changes in chartData. When chartData changes, the chart is updated accordingly. This ensures that the chart always reflects the latest data.