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 JavaScript Basics Working with Strings Combine and Manipulate Strings

Jordan Branch
Jordan Branch
2,762 Points

Cannot read property '1' of null

I do not fully understand what I'm doing wrong.

let firstName = 'jordan';
let lastName = 'branch';
let role = 'developer';
let msg = firstName + " " + lastName + ": " + role;
let msg = firstName + " " + lastName + ": " + role.toUpperCase;

1 Answer

Steven Parker
Steven Parker
215,372 Points

The hint isn't very helpful, but there are two issues here:

  • you should only declare a variable once (using "let")
  • when you call a function (like toUpperCase), you need parentheses after the name