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.

Brenda Bouchard
5,028 PointsChalenge 2 Task 2
I don't understand the'#' symbol
var id = "23188xtr";
var lastName = "Smith";
console.log(id.toUpperCase());
var userName = id + lastName;
console.log(lastName.toUpperCase());
var userName = ("id '#' lastName");
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JavaScript Basics</title>
</head>
<body>
<script src="app.js"></script>
</body>
</html>
2 Answers

Colin Bell
29,679 PointsIt's just wanting you to concatenate an all uppercase id
with a literal #
character followed by an all uppercase version of lastName
and set it all as the userName
variable.
Since you want the values of id
and lastName
variables, you don't put quotes around them. You do want the actual #
character, so you put quotes around it. Use the +
sign to concatenate in JavaScript:
var id = "23188xtr";
var lastName = "Smith";
var userName = id.toUpperCase() + "#" + lastName.toUpperCase();

TJ Egan
14,420 PointsWhat are you trying to achieve? The # sign is used to denote an 'id'
<div id = "main"><div>
This would be accessed with the # symbol, such as #main