Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Generics in Swift Generic Functions, Parameters and Constraints Generic Functions

Creating a generic function, code challenge IOS

I need a little assistance with the body of this method. I have tried declaring item and numberoftimes as variables inside the function, setting the result to equal a constant call duplicate and returning duplicate but this did not work

func duplicate<T>(_  item: T , _ numberOfTimes: Int) -> [T] {


1 Answer

Jeff McDivitt
Jeff McDivitt
23,970 Points

To complete the challenge your code should match the below:

  1. You are creating a new array to hold the new output
  2. You are writing a for loop to handle this operation
  3. You are retiring the new array
func duplicate<T>(item:T, numberOfTimes:Int) -> Array<T> {
    var newArray: [T] = []
    for _ in 0..<numberOfTimes {
    return newArray