Check iranian Bank Card Validation

iranianBankCardCheck.swift

// Create by love : Mohammad Nasrabadi [github](https://github.com/mmnasrabadi)


iranianBankCardCheck(5041721046432655)
iranianBankCardCheck(6037997561388217)
iranianBankCardCheck(6362141802359837)
iranianBankCardCheck(6273811616832991)
iranianBankCardCheck(6037997561388217)
iranianBankCardCheck(6104337824093650)
iranianBankCardCheck(3982309207502750)
iranianBankCardCheck(2412345245245251)



func iranianBankCardCheck(_ number: Int) -> Bool {
    let card = number.digits.dropLast()
    guard isInRengIranCard(zeroNumber: card[0]) else {
        return false
    }
    let a = card.enumerated().filter {  $0.offset.isMultiple(of: 2)   }.compactMap { $0.element * 2 }.compactMap { $0>9 ? ($0-9) : ($0) }.reduce(0 , +)
    let b = card.enumerated().filter { !($0.offset.isMultiple(of: 2)) }.compactMap { $0.element * 1 }.reduce(0 , +)
    if (a + b + (number.digits.last ?? 0)).isMultiple(of: 10) {
        return true
    }
    return false
}
func isInRengIranCard(zeroNumber: Int) -> Bool {
    for i in [2,4,5,6,9] {
        if zeroNumber == i {
            return true
        }
    }
    return false
}


extension LosslessStringConvertible {
    var string: String { .init(self) }
}
extension Numeric where Self: LosslessStringConvertible {
    var digits: [Int] { string.digits }
}
extension StringProtocol  {
    var digits: [Int] { compactMap(\.wholeNumberValue) }
}