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 JavaScript and the DOM (Retiring) Responding to User Interaction Event Bubbling and Delegation

Vic Mercier
Vic Mercier
3,276 Points

Callback

I don't understand what is a call back.Can someone explain me?

1 Answer

Steven Parker
Steven Parker
229,582 Points

A "callback" is just a function passed to another function as an argument.

The other function will then call the "callback" function to indicate some event, usually at a later time.

You'll see plenty of examples of these when you work with event handlers, timers, AJAX requests, and other operations where the program must respond to things which will happen in the future.