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

You actually can create a Set object pretty easy (in contradiction to GoZoner, there is a built in contains method):

class Set {
    var items : T[] = []

    func add(item : T) {
        if !contains(items, {$0 == item}) {
            items += item
        }
    }
}

and you maybe even want to declare a custom operator:

@assignment @infix func +=  (inout set : Set, items : T[]) -> Set {
    for item in items {
        set.add(item)
    }
    return set
}