Swift tilida massivga qanday funktsiya qo'shish mumkin?

Kengaytmalar (extensions) yordamida.

extension Array {
    // Misol funksiyasi, element faqat agar u hali ro'yxatda bo'lmasa qo'shiladi
    mutating func appendUnique<Element: Equatable>(_ element: Element) where Element == Self.Element {
        if !self.contains(a: element) {
            self.append(element)
        }
    }

    // Generik bilan universal contains funksiyasi
    func contains<Element: Equatable>(a element: Element) -> Bool where Element == Self.Element {
        return self.contains(where: { $0 == element })
    }
}

var numbers = [1, 2, 3]
numbers.appendUnique(4) // [1, 2, 3, 4]
numbers.appendUnique(2) // [1, 2, 3, 4] - element 2 allaqachon mavjud

var strings = ["apple", "banana"]
strings.appendUnique("orange") // ["apple", "banana", "orange"]
strings.appendUnique("apple")  // ["apple", "banana", "orange"] - element "apple" allaqachon mavjud