How to create array of unique object list in Swift

Question

How can we create unique object list in Swift language like NSSet & NSMutableSet in Objective-C.

Answer 1

I thought a struct with an internal Dictionary would be the way to go. I have only just started using it, so it’s not complete and I have no idea on performance yet.

struct Set
{
    var _items : Dictionary = [:]

    mutating func add(newItem : T) {
        _items[newItem] = true
    }

    mutating func remove(newItem : T) {
        _items[newItem] = nil
    }

    func contains(item: T) -> Bool {
        if _items.indexForKey(item) != nil { return true } else { return false }
    }

    var items : [T] { get { return [T](_items.keys) } }
    var count : Int { get { return _items.count } }
}