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! While you're at it, check out some resources Treehouse students have shared here.

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 Asynchronous JavaScript with Callbacks Implement a Callback

Eddie Lam
Eddie Lam
2,681 Points

What's the difference between referencing and using a callback to invoke generateHTML?

I realize you can also just nest generateHTML inside an arrow function to work as a callback

btn.addEventListener("click", () => { getJSON(astroUrl, (json) => { json.people.map((person) => { getJSON(wikiUrl + person.name, (data) => { generateHTML(data); }); }); }); });

How is it different from simply referencing generateHTML?

btn.addEventListener("click", () => { getJSON(astroUrl, (json) => { json.people.map((person) => { getJSON(wikiUrl + person.name, generateHTML); }); }); });