Mastering JavaScript Asynchronous Programming

Asynchronous programming is crucial for building responsive web applications. Let's dive into the key concepts.

Understanding Promises

Promises are the foundation of modern async JavaScript:

const fetchData = () => {
  return new Promise((resolve, reject) => {
    // Async operation
    if (success) {
      resolve(data);
    } else {
      reject(error);
    }
  });
};

Async/Await

Make async code look synchronous:

async function getData() {
  try {
    const result = await fetchData();
    return result;
  } catch (error) {
    console.error(error);
  }
}

Best Practices

• Always handle errors
• Use try/catch with async/await
• Avoid callback hell
• Consider Promise.all for parallel operations