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 Generics in Swift Generic Functions, Parameters and Constraints Generic Functions

What is going on here?

I don't know why this is not compiling I have tried but it is not even compiling

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

}

This is how I think it is but I don't know why it is not compiling

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


}

1 Answer

Going by the code you've given, this won't compile. The reason is that you declared your function to return a [T]. But, your function body is empty AKA no return statement. So you've gone against your declaration.

In your function body just put return [item] That should help you temporarily compile it.