VinValidator2

VinValidator2.kt

object VinValidator2 {
    private val values = intArrayOf(1, 2, 3, 4, 5, 6, 7, 8, 0, 1,
            2, 3, 4, 5, 0, 7, 0, 9, 2, 3,
            4, 5, 6, 7, 8, 9)
    private val weights = intArrayOf(8, 7, 6, 5, 4, 3, 2, 10, 0, 9,
            8, 7, 6, 5, 4, 3, 2)

    fun isValid(vin: String): Boolean {
        var s = vin

        s = s.replace("-".toRegex(), "")
        s = s.toUpperCase()
        if (s.length != 17) return false
        var sum = 0
        for (i in 0..16) {
            val c = s[i]
            var value: Int
            val weight = weights[i]

            // letter
            if (c in 'A'..'Z') {
                value = values[c - 'A']
                if (value == 0) return false
            } else if (c in '0'..'9') value = c - '0' else return false
            sum += weight * value
        }

        // check digit
        sum %= 11
        val check = s[8]
        if (check != 'X' && (check < '0' || check > '9')) return false
        return if (sum == 10 && check == 'X') true else sum == check - '0'
    }
}

https://introcs.cs.princeton.edu/java/31datatype/VIN.java.html