Engineering2026-01-141 min read

Asynchronous JavaScript

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Handling asynchronous operations is critical in JavaScript. The Evolution 1. Callbacks (Callback Hell) 2. Promises 3. Async/Await Code Comparison Using Promises...

#javascript #async #programming

Handling asynchronous operations is critical in JavaScript.

The Evolution

Callbacks (Callback Hell)
Promises
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

Written by

JS Ninja

Tags#javascript #async #programming

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