How do I handle errors in callbacks?

How do I handle errors in callbacks?

You can handle errors in callbacks by using error-first callback patterns. This means the first argument of the callback function should be an error object.

Can you give me an example of that?

Sure! Here's a simple example:

function fetchData(callback) {
    // Simulating an async operation
    setTimeout(() => {
        const error = null; // or an error object
        const data = 'Sample data';
        callback(error, data);
    }, 1000);
}

fetchData((error, data) => {
    if (error) {
        console.error('Error fetching data:', error);
        return;
    }
    console.log('Data received:', data);
});

What if I want to handle multiple errors?

You can extend the error handling by checking for different error types or using a centralized error handler. This way, you can manage various errors more effectively.