Edudjr
/ Luhn.swift
Last active
February 15, 2024 20:33
— forked from cwagdev/Luhn.swift
Luhn Algorithm in Swift 4.1
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| func luhnCheck(_ number: String) -> Bool { | |
| var sum = 0 | |
| let digitStrings = number.reversed().map { String($0) } | |
| for tuple in digitStrings.enumerated() { | |
| if let digit = Int(tuple.element) { | |
| let odd = tuple.offset % 2 == 1 | |
| switch (odd, digit) { | |
| case (true, 9): |