Sha256: 7cdc4f67615a0c8658ab81f6d41eb6bb646e16a78da74cff162fa2e0d8a7b5cd
Contents?: true
Size: 1.52 KB
Versions: 133
Compression:
Stored size: 1.52 KB
Contents
import Foundation
struct Luhn {
var number: Int64 = 0
var numberString: String = ""
var addends: [Int] { return addendsFunc(numberString) }
var checksum: Int { return addends.reduce(0, +) }
var isValid: Bool = false
init(_ num: String ) {
self.numberString = num.replacingOccurrences(of: " ", with: "")
let num = Int64(numberString)
if self.numberString.utf16.count <= 1 {
self.isValid = false
} else if num == nil {
isValid = false
} else {
self.number = num!
isValid = checksum % 10 == 0
}
}
func addendsFunc(_ num: String) -> [Int] {
func oddIndexInt64Minus9( _ input: [Int]) -> [Int] {
var input = input
input = Array(input.reversed())
var tempArray: [Int] = []
for (inx, each) in input.enumerated() {
var tempEach: Int = each
if (inx+1) % 2 == 0 {
tempEach *= 2
if tempEach >= 10 {
tempEach -= 9
}
tempArray.insert(tempEach, at: 0)
} else {
tempArray.insert(tempEach, at: 0)
}
}
return tempArray
}
func char2Int(_ input: Character) -> Int {
let tempInt = Int(String(input)) ?? -1 // -1 = error
return tempInt
}
return oddIndexInt64Minus9(Array(num.characters).map { char2Int($0) })
}
}
Version data entries
133 entries across 133 versions & 1 rubygems