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.

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

Use a for in loop to log each of the property names of the shanghai object to the console.

Use a for in loop to log each of the property names of the shanghai object to the console.

script.js
var shanghai = {
  population: 14.35e6,
  longitude: '31.2000 N',
  latitude: '121.5000 E',
  country: 'CHN'
};
for (   property in shanghai ) {
  console.log(property[shanghai]);
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

Brendan Whiting
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Brendan Whiting
Front End Web Development Techdegree Graduate 84,676 Points

They want you to print out just the property, also you need to use either the var keyword when declaring that local variable at the beginning of the loop:

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

FYI, if they wanted you to print out the property value instead if the property name, you could do that with shanghai[property]; property[shanghai] is going to break. shanghai is the object and you access properties either with dot notation or bracket notation with the key name.