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 trialJobelle Galvan
3,126 Pointswhat is wrong with my code, I had a bummer says "try and use trailing closure" which I already did.
what is wrong with my code, I had a bummer says "try and use trailing closure" which I already did.
func double(_ i: Int) -> Int {
return i * 2
}
let doubler = double
let doubledValues = [1,2,3,4].map(doubler)
let numbers = [1, 2, 3, 4]
numbers.map({(_ value: Int) -> Int in return value * 2})
numbers.map({value in return value * 2})
numbers.map({value in value * 2})
numbers.map({$0 * 2})
numbers.map(){ $0 * 2 }
numbers.map {$0 * 2}
1 Answer
Caleb Kleveter
Treehouse Moderator 37,862 PointsSorry it took me so long to get to this, my fault.
All you need to do to pass the challenge is to modify the existing code on this line:
let doubledValues = [1,2,3,4].map(doubler)
You should change the call to the map
method so you use a trailing closure and the auto-generated parameter name.