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

The cleanest way to solve this in Swift 3 is using the filter function as follows:

func anyCommonElements(_ lhs: T, _ rhs: U) -> [T.Iterator.Element]
    where T.Iterator.Element: Equatable, T.Iterator.Element == U.Iterator.Element {
        return lhs.filter { rhs.contains($0) }
}