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.


Kevin O'Donoghue
Kevin O'Donoghue
8,995 Points

Is this the correct usage of extending a class?


I have made a mini dom manipulation library in codepen to test what I learned about js classes however after looking at the code it feels like a lot of boilerplate and wondered whether there is a better way to do what i'm doing.


Any help much appreciated, Matt

1 Answer

Steven Parker
Steven Parker
220,513 Points

If you just wanted to practice class structures it looks like you did a good job. Otherwise, I'm not quite sure what you're after. If I wanted functionality like this, I'd just load jQuery.

One issue caught my eye: there's no "getElementsByID" (plural) method. Since ID's must be unique, there's only a "getElementById" method that returns a single element.