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Asynchronous JavaScript
JS Ninja · 2026-01-14 · via tanscp

Handling asynchronous operations is critical in JavaScript.

The Evolution

  1. Callbacks (Callback Hell)
  2. Promises
  3. Async/Await

Code Comparison

Using Promises:

JavaScript

fetchData()
  .then(data => process(data))
  .catch(err => console.error(err));

Using Async/Await:

JavaScript

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

Promise State Machine