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!

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

iOS Build a Playlist Browser with Swift Building the Music Library and Playlist Models Creating UIImageView instances

Sonal Vajandar
Sonal Vajandar
2,003 Points

Why do we use the round braces when we are assigning the "friends" property of Treehouse structure to the var friends.

Why can we not assign it as follows let friends = Treehouse.friends

Typically we do not need the braces to access properties. So

why do we assign it as let friends = Treehouse().friends

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {

        let friends = Treehouse().friends

        //Add your code below


struct Treehouse {
    let friends = [
        "firstName": "Susan",
        "lastName": "Olson",
        "profilePicture": "susan_profile.png"

1 Answer

Michael Hulet
Michael Hulet
47,909 Points

In this case, you're creating a new instance of the Treehouse struct, and getting the friends property of the new instance. It's because you're creating a new instance that you have to use the parentheses. Here's a perfectly valid way to do it without the parentheses:

let newTreehouse = Treehouse()
let friends = newTreehouse.friends