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

Nan Wang
Nan Wang
10,036 Points
Posted by Nan Wang
Nan Wang
10,036 Points

Generic in Swift 3, first Challenge. i still don't know how to solve this

How to solve this challenge?

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

2 Answers

maxmelon
maxmelon
6,897 Points
maxmelon
maxmelon
6,897 Points

Hi Nan!

This should work:

func duplicate<T>(item: T, numberOfTimes: Int) -> [T] {
    var array: [T] = []
    for _ in 1...numberOfTimes {
        array.append(item)
    }
    return array
}
Kapil Soni
Kapil Soni
2,612 Points
Kapil Soni
Kapil Soni
2,612 Points 
func duplicate<T> (item: T, numberOfTimes: Int) -> [T]  {
    var someArray  = [item]
    for _ in 1..<numberOfTimes {
        someArray.append(item)
    }
    return someArray as! [T]
}

duplicate(item: 2, numberOfTimes: 3)

this worked