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 Objects Loop Through Objects Use `for in` to Loop Through an Object's Properties

Euan Canoy
Euan Canoy
918 Points

How to access object within object using for in

If I had an object within an object, would I use bracket notation twice.

Ex.

For (key in person) For (name in key) Console.log(person[key][name])

1 Answer

Steven Parker
Steven Parker
229,982 Points

The key itself would not be the inner object, but the value associated with it would.
So for the inner loop you might write:
  for (name in person[key])

But note that the double loop would only make sense if every property of the outer object was another object.