Use a function to find common elements in two sequences in Swift

Question

I\'m trying to complete the exercise on page 46 of Apple\'s new book \"The Swift Programming Language\". It gives the following code:

func anyCommonElements         


        

Answer 1

From Swift 3, Generator protocol is renamed Iterator protocol : (link to github proposal)

So, the function need to be written:

func commonElements(_ lhs: T, _ rhs: U) -> [T.Iterator.Element]
    where T.Iterator.Element: Equatable, T.Iterator.Element == U.Iterator.Element {
        var common: [T.Iterator.Element] = []

        for lhsItem in lhs {
            for rhsItem in rhs {
                if lhsItem == rhsItem {
                    common.append(lhsItem)
                }
            }
        }
        return common
}