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

iOS

Posted by Danny Kilkenny
Danny Kilkenny
4,507 Points

Help Needed With First Closures Challenge Part 2 of 2

I am very confused as to why my code isn't correctly solving the Closures Challenge.

Here is the prompt: Assign the addTwo function we just created to a constant named addition.

Call the function using the constant and pass in an argument. Assign the resulting value to a constant named result.

func addTwo(x: Int) -> Int {
    return 2 + x
}

let addition = addTwo
addition(x: 6)
let result = addition

Could someone please help with this?

3 Answers

Lamar Greene
Lamar Greene
9,581 Points

I don't recall taking this course yet, but hopefully this is the answer...

I think the confusion lies in the last line of the directions. When you call 

addition(x: 6)

that is all you are doing. In the next line, where you assign addition to the constant result, you are essentially saying result is also ANOTHER constant for the function addTwo().

I believe you need to have result be the constant of the actual call to addition, with the argument passed. like so...

func addTwo(x: Int) -> Int {
    return x + 2
}

let addition = addTwo
let result = addition(6)
Danny Kilkenny
Danny Kilkenny
4,507 Points

Yeah I tried that too cause that's what I originally had but it still said "Make sure you assign the result of calling addTwo to the constant result"

Lamar Greene
Lamar Greene
9,581 Points

can you provide a link to the challenge?

Danny Kilkenny
Danny Kilkenny
4,507 Points

Sure! The solution to part 1 is just the extension without any of the function code. https://teamtreehouse.com/library/closures-in-swift-2/first-class-functions/functions-as-first-class-citizens

Lamar Greene
Lamar Greene
9,581 Points

It looks to be a syntax issue. I have edited my answer to reflect... Calling addition with the x: in the argument was throwing the error.

Danny Kilkenny
Danny Kilkenny
4,507 Points
Danny Kilkenny
Danny Kilkenny
4,507 Points

Thank you so much!!!

Adam Mazurick
PLUS
Adam Mazurick
Courses Plus Student 7,653 Points
Adam Mazurick
Adam Mazurick
Courses Plus Student 7,653 Points

func addTwo(to: Int) -> Int { return to + 2 }

let addition = addTwo

let result = addition(6)