Проверка ИНН на валидность. Алгоритм на Swift. #swift #inn #tin

INN.swift

class INNTests: XCTestCase {
  override func setUp() {
        super.setUp()
  }
  override func tearDown() {
        super.tearDown()
   }
  func testInn() {
        func checkInn(_ inn:String) -> Bool {
            let len = inn.count
            let inn:[Int] = inn.compactMap{$0.wholeNumberValue}
            guard len == inn.count else {return false}

            let controlTen = [2,4,10,3,5,9,4,6,8]
            let controlEleven1 = [7,2,4,10,3,5,9,4,6,8]
            let controlEleven2 = [3,7,2,4,10,3,5,9,4,6,8]

            switch len {
            case 10:
                return inn[9] == ((inn.dropLast().enumerated().map{$0.element * controlTen[$0.offset]}).reduce(0, +) % 11) % 10
            case 12:
                return inn[10] == ((inn.dropLast(2).enumerated().map{
                    $0.element * controlEleven1[$0.offset]

                }).reduce(0, +) % 11) % 10
                    && inn[11] == ((inn.dropLast().enumerated().map{$0.element * controlEleven2[$0.offset]}).reduce(0, +) % 11) % 10
            default:
                return false
            }
        }
        let testing = ["132202672804", "7714406168", "7744001497", "1234567890"]
        let results = testing.map{checkInn($0)}
        _ = results.dropLast().map{assert($0, "Failed check INN!")}
    }
}