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 Async Programming and Callback Functions

Posted by Alsaig Sandra
.a{fill-rule:evenodd;}techdegree seal-36
Alsaig Sandra
Front End Web Development Techdegree Graduate 15,434 Points

Not understanding (json)

Why is the parameter of the callback function isn't (data)? Why is it (json)? Or am I wrong in assuming that that's the same argument?

Shumin Zhou
.a{fill-rule:evenodd;}techdegree seal-36
Shumin Zhou
Full Stack JavaScript Techdegree Graduate 32,510 Points

Hi, you can name your parameter name whatever you want, but whatever you name that parameter, it will hold a data that will pass into this function.

1 Answer

Steven Parker
Steven Parker
231,268 Points
Steven Parker
Steven Parker
231,268 Points

As Shumin pointed out, the parameter name itself is not important to the operation of the function. But it's considered a "best practice" to use a name that represents the kind of content that the parameter is expected to have.

So in this case, naming it "json" is a bit more descriptive than just "data" if the contents are going to be in JSON format.