Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community!

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript Asynchronous Programming with JavaScript Understanding Promises Using Fetch

Samuel Kleos
Samuel Kleos
Front End Web Development Techdegree Student 11,860 Points

When is the promise being created by fetch()?

Looking at the following line by line:

btn.addEventListener('click', (event) => {
    event.target.textContent = "Loading...";
        .then(response => response.json())
        .finally(() => event.target.remove());

Is the promise object being created after you pass astrosUrl to fetch() or is it being created by the .json() method.

1 Answer

Steven Parker
Steven Parker
224,936 Points

The promise object is created immediately upon calling fetch, but at that time it will still be in a pending state. The .json() method is not called until later when the promise has been (successfully) resolved.