Swift - Generics (like template in c++) [ swift programming language apple ios]

Generics (like template in c++)

“func repeat<ItemType>(item: ItemType, times: Int) -> ItemType[] {

    var result = ItemType[]()

    for i in 0..times {

        result += item

    }

    return result

}

repeat("knock", 4)”

“// Reimplement the Swift standard library's optional type

enum OptionalValue<T> {

    case None

    case Some(T)

}

var possibleInteger: OptionalValue<Int> = .None

possibleInteger = .Some(100)”