JavaScript async functions without await: Explained

JavaScript async functions are a powerful tool for handling asynchronous operations in a synchronous-looking way. They allow us to write code that looks like it's blocking, but actually runs non-blocking in the background, making our applications more efficient and responsive.

But what happens when we use an async function without an await keyword? In short, the function will still return a Promise, but it won't wait for any asynchronous operations to finish before doing so.

This means that any code after the async function call will run immediately, regardless of whether the async function has finished or not. For example:


async function getData() {
  const response = await fetch('https://jsonplaceholder.typicode.com/todos/1');
  const data = await response.json();
  console.log(data);
}

getData(); // logs data to console

console.log('Hello world!'); // logs immediately

In this example, the getData() function makes two asynchronous operations: fetching data from a URL and parsing it as JSON. Both of these operations take time to complete, but because we've used the await keyword, the getData() function won't return until both operations have finished.

However, the console.log('Hello world!') statement will run immediately after the getData() function call, regardless of whether the async operations have finished or not. This means that the order of the console logs might not be what we expect.

In conclusion, while it's possible to use async functions without await, it's important to understand the implications of doing so. Code that comes after the async function call will run immediately, regardless of whether the async operations have finished or not.

├Źndice
  1. Summary

Summary

  • JavaScript async functions allow us to write non-blocking code in a synchronous-looking way.
  • Using an async function without an await keyword will still return a Promise, but won't wait for asynchronous operations to finish.
  • Code that comes after an async function call without await will run immediately, regardless of whether the async operations have finished or not.
Click to rate this post!
[Total: 0 Average: 0]

Related posts

Leave a Reply

Your email address will not be published. Required fields are marked *

Go up

Below we inform you of the use we make of the data we collect while browsing our pages. You can change your preferences at any time by accessing the link to the Privacy Area that you will find at the bottom of our main page. More Information