Sha256: 5a9333e3dd4cbc5b1b23efbde3f01be11172a7dbed28947b3d78cd11e9ae1c18
Contents?: true
Size: 1014 Bytes
Versions: 107
Compression:
Stored size: 1014 Bytes
Contents
struct IsbnVerifier {
static func isValid(_ string: String) -> Bool {
// This will be considerably less awkward after Swift 3 support is dropped
let cleanedString = string.characters.split(separator: "-").map(String.init).joined()
guard cleanedString.characters.count == 10 else {
return false
}
var digits = [Int]()
for character in cleanedString.characters.dropLast() {
if let digit = Int(String(character)) {
digits.append(digit)
} else {
return false
}
}
if cleanedString.characters.last == "X" {
digits.append(10)
} else if let last = cleanedString.characters.last, let digit = Int(String(last)) {
digits.append(digit)
} else {
return false
}
let sum = digits.enumerated().reduce(0) {
return $0 + (10 - $1.offset) * $1.element
}
return sum % 11 == 0
}
}
Version data entries
107 entries across 107 versions & 1 rubygems