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 jQuery Basics (2014) Creating a Simple Lightbox Perform: Part 4

Why don't we use "const" or "let" in place of "var" in some of these projects? Specifically - the Lightbox project.

So, I broke off into the "Full Stack Javascript" from "Front Front Web Dev" track because I was having trouble understanding jQuery. After a few courses, I learned just enough to be dangerous. I'm noticing that throughout the challenges and lessons on the Web Dev track, we're using "var" everywhere-even when "const" would be preferable? Admittedly, I don't always completely read all teachers notes - so forgive me if this was answered in some incredibly obvious place.

(sidenote: I just went back to where I got lost in jQuery and everything makes so much more sense. That full stack javascript track is next. take. my. money.)

1 Answer

Steven Parker
Steven Parker
216,083 Points

Both "const" and "let" are relatively recent additions to JavaScript (since 2015), and many of the courses were either developed before then, or before the changes had been adopted widely enough in browsers in use to make using the new syntax for public website projects a good idea.

You can substitute "const" or "let" for "var" in other projects as long as you're mindful of the differences in scope and how they may pertain to the situation. But for the most part, it won't be pertinent to the concepts being taught.