Why won't this concatenation work? I have tried += and x + y + z formatting.

Question

I have created a variable called userName and assigned the output of toUpperCase(id). I have tried to add the # and SMITH like this

var userName = String.prototype.toUpperCase(id) + "#" + String.prototype.toUpperCase(lastName);

and like this var userName = String.prototype.toUpperCase(id); userName += "#"; userName += String.prototype.toUpperCase(lastName);

What am I missing?

app.js

var id = "23188xtr";
var lastName = "Smith";

var userName = String.prototype.toUpperCase(id);
userName += "#"; 
userName =+ String.prototype.toUpperCase(lastName);

index.html

<!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>

Answer 1 · 2016-07-11T17:36:07Z

July 11, 2016 5:36pm

Hi there! In your last line, you have the + and equals signs backwards. It should be +=. But even if I change that, the challenge still fails. You ned to run the toUpperCase method directly on the string in question.

var userName = id.toUpperCase() + "#" + lastName.toUpperCase();

Hope this helps!

edited for accuracy and additional information

Here's the MDN documentation:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase

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Daniel Glennie

Daniel Glennie

Why won't this concatenation work? I have tried += and x + y + z formatting.

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Jennifer Nordell

Jennifer Nordell

Daniel Glennie

Daniel Glennie