Async JS Intro

Relax. We'll talk through this in plain words — no textbook voice.

JavaScript is single-threaded, but with asynchronous operations it can handle time-consuming tasks (e.g., network requests) without blocking the program's main thread.

Ways to handle asynchronous JS:

1. Callbacks: (Old way)

2. Promises: (Better way)

3. Async/Await: (Modern, cleanest way)

javascript

console.log("Start");

// setTimeout is an asynchronous function.
setTimeout(() => {
  console.log("This message is shown after 2 seconds.");
}, 2000);

console.log("End");

You should see

Start End (2 seconds later) This message is shown after 2 seconds.