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 JavaScript Basics Working with Strings Combine and Manipulate Strings

Getting error -> Bummer: Cannot read property '1' of null

I have seen the posts related and tried changing everything i can think of.

Why are my dec. variables showing up red?

app.js
const firstName = "Emmitt";
const lastName = "Harrow";
const role = "developer";
let msg = firstName + ' ' + lastName + ': ' role;

The variables that I am trying to catenate in line 4 show up green like they are supposed to in this snippet but in my workshop program they are still red and it won't let me continue untilI fix the error. Not sure what's happening here.

1 Answer

Steven Parker
Steven Parker
231,248 Points

This code is missing the concatenation operator (+) between the last literal string and the variable role.