Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript

A general question about Node's `response.on`

response.on('data', (d) => { process.stdout.write(d); });

I understand response is an object, and I think .on is a method on that object(...?). I can't find any docs on the .on method, what (presumably fundamental!) purpose does it serve?

1 Answer

Steven Parker
Steven Parker
221,323 Points

The response.on() method establishes event handlers.

The first argument is the type of event, and the second one is the function to be called when the event occurs.

Your example above establishes a handler for the data event that will simply write out each chunk of data as it arrives.

There are several examples of .on() in the Node documentation for the HTTP module.