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 Loops, Arrays and Objects Tracking Data Using Objects Accessing All of the Properties in an Object

Carl Conroy
Carl Conroy
8,677 Points
Posted by Carl Conroy
Carl Conroy
8,677 Points

What is wrong with my code here?

I kept getting the same error, so I went back and copy/pasted the EXACT code which runs perfectly fine in the exercise before this (checked by the console) and replaced the variable names.

Am I misunderstanding the question?

script.js 
var shanghai = {
  population: 14.35e6,
  longitude: '31.2000 N',
  latitude: '121.5000 E',
  country: 'CHN'
};

for (var in shanghai){
  console.log(var);
}
index.html 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript Objects</title>
</head>
<body>
<script src="script.js"></script>
</body>
</html>

1 Answer

Josh Thackeray
Josh Thackeray
9,895 Points
Josh Thackeray
Josh Thackeray
9,895 Points

In your for loop. You have not actually declaring a variable in your arguments. Where you have put this:

for (var in shanghai){
  console.log(var);
}

The word 'var' is a keyword and cannot be used to name variables. You should use a word like 'key' or something other else but not any of the predefined keywords in JavaScript.

For example:

for (key in shanghai){
  console.log(key);
}
Carl Conroy
Carl Conroy
8,677 Points
Carl Conroy
Carl Conroy
8,677 Points

Thanks Josh! I realized part of what I did was miss a word in my code. Appreciate you taking the time to answer.