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Luhn check modified with enumerate
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| func lunhCheck(number : String) -> Bool | |
| { | |
| return reduce(enumerate(reverse(number).map { String($0).toInt()! }), 0) { | |
| let odd = $1.0 % 2 == 1 | |
| return $0 + (odd ? ($1.1 == 9 ? 9 : ($1.1 * 2) % 9) : $1.1) | |
| } % 10 == 0 | |
| } | |
| lunhCheck("49927398716") | |
| lunhCheck("49927398717") |
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