Sha256: 6f0282f5ca8f7ca7886a6115473cbe6fe88056732b3befad0dbc01c3dae6bf00
Contents?: true
Size: 1.68 KB
Versions: 59
Compression:
Stored size: 1.68 KB
Contents
import Foundation
struct Luhn {
var number: Int64 = 0
var addends: [Int] { return addendsFunc(number)}
var checksum: Int {return addends.reduce(0, +) }
var isValid: Bool { return checksum % 10 == 0}
init(_ num: Int64) {
self.number = num
}
static func create (_ num: Int64) -> Double {
func createCheckDigit(_ value: Int) -> Int {
let nearestTen = Int(ceil((Double(value) / 10.00)) * 10)
return nearestTen - value
}
let zeroCheckDigitNumber = num * 10
let luhn = Luhn(zeroCheckDigitNumber)
if luhn.isValid {
return Double(zeroCheckDigitNumber)}
return Double((zeroCheckDigitNumber) + createCheckDigit(luhn.checksum))
}
func addendsFunc(_ num: Int64) -> [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
}
let tempString = "\(num)"
return oddIndexInt64Minus9(Array(tempString.characters).map {char2Int($0)})
}
}
Version data entries
59 entries across 59 versions & 1 rubygems