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 Quickstart Functions Write a Function

Posted by taylor hardie
taylor hardie
89 Points

anyone know where I'm going wrong?

missing something here...

script.js 
function add10(num, + 10){
  return num + 10;
}
console.log( add(num, 10);
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="script.js"></script>
</body>
</html>

1 Answer

Steven Parker
Steven Parker
229,644 Points
Steven Parker
Steven Parker
229,644 Points

The function is intended to have just one parameter. Also, even if a second one was needed, operators and numbers cannot be used as parameter names.

And the function call on the last line has several issues:

  • the parentheses are unbalanced, it's missing a closing parenthesis at the end
  • it's calling "add" but the function name is "add10"
  • it should pass just one argument (the literal this time)
  • you only need to call the function, you don't also need to log the result