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 Access and Set Object Properties

Posted by Jeremy Smalley
Jeremy Smalley
8,529 Points

Not sure what I need to do. Where is this related in what video?

Add a new property -- country -- to newYork. Don't change the original object, just add this new property using a = sign to assign the country property to USA.

script.js 
var newYork = {
  population: 100, 
  latitude: '40.7127 N',
  longitude: '74.0059 W'
};

newYork.population = 8.406e6;
index.html 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript Objects</title>
</head>
<body>
<script src="script.js"></script>
</body>
</html>

7 Answers

rydavim
rydavim
18,814 Points
rydavim
rydavim
18,814 Points

You can do this using the same technique you used in the first part of the challenge. 

newYork.country = 'USA';

Edit - To clarify, setting a property will 'create' it if there is no property by that name.

Jeremy Smalley
Jeremy Smalley
8,529 Points
Jeremy Smalley
Jeremy Smalley
8,529 Points

Ah, duh.. forgot the 'USA'

Charles Cunningham
Charles Cunningham
7,322 Points
Charles Cunningham
Charles Cunningham
7,322 Points

Ran into the same issue. Just add the ' ' to make the value a string so it responds correctly.

Adam Maley
Adam Maley
5,946 Points
Adam Maley
Adam Maley
5,946 Points

they did not address this in the videos...

Andrei Li
Andrei Li
34,486 Points
Andrei Li
Andrei Li
34,486 Points

-- country -- What are the dashes for in the country? Is it to say that it's property of an object?

Caden Ingram
Caden Ingram
6,482 Points
Caden Ingram
Caden Ingram
6,482 Points

i cant do it, it wont let me do newYork.country = 'USA';

tomaszfurmanczyk
seal-mask
.a{fill-rule:evenodd;}techdegree
tomaszfurmanczyk
Full Stack JavaScript Techdegree Student 18,242 Points
tomaszfurmanczyk
.a{fill-rule:evenodd;}techdegree
tomaszfurmanczyk
Full Stack JavaScript Techdegree Student 18,242 Points

var newYork = { population: 100, latitude: '40.7127 N', longitude: '74.0059 W' };

newYork.population = 8.406e6;

//places a new poperty to newYork assigned country

newYork.country = "USA";