How to determine if one array contains all elements of another array in Swift?

Question

I have 2 arrays:

var list:Array = [1,2,3,4,5]
var findList:Array = [1,3,5]

I want to determine if list A

Answer 1

In Swift 3 or Swift 4 you can write this:

extension Array where Element: Equatable {
    func contains(array: [Element]) -> Bool {
        for item in array {
            if !self.contains(item) { return false }
        }
        return true
    }
}

You can see the contains method here

This is just a simple extension that check if the array that you give is in the current array (self)