Here is some code I have written unfortunately it doesn't work. These are the errors I get: cannot pass immutable value as inout argument: function call returns an immutable value. Type '()' cannot conform to 'Sequence'.

func reverse( from array: inout [Int]) -> [Int] { var arrayRes : [Int] = [] if array == [] { return array } else if array.count == 1 { return array } else { // Swap first two members array.swapAt(0, 1) // Break down the array into smaller parts arrayRes = reverse( &Array(array[2..<array.count])) // Append one of the arrays which has been reversed and append the solved part return array[0...1] += arrayRes } }

hi Mark,

i am not sure why you need an inout argument (your function call returns a new array, but it would also create the side effect on the incoming argument of swapping the first two elements). the easiest translation of your code to do what i think you want it to do is

func reverse(from array: [Int]) -> [Int] {
    guard array.count >= 2 else {
        return array
    }
    var firstTwoElements = Array(array[0...1])
    firstTwoElements.swapAt(0,1)
    return firstTwoElements + reverse(from: Array(array[2..<array.count]))
}

by the way, it helps to enclose any code you post by starting and ending with three consecutive backticks ``` on their own line. that's what triggers the code formatting above.

hope that helps,

DMG