How to validate iranian Melli Code (National Code or Code Melli) in android

Question

I need a method to validate the Melli Code (National Code or Code Melli) of iranian people.

I Know it has a formula.

Answer 1

I have so many different versions of it here but the following is its Kotlin version,

fun isValidIranianNationalCode(input: String): Boolean {
  if (!"^\\d{10}$".toRegex().matches(input))
    return false

  input.toCharArray().map(Character::getNumericValue).let {
    val check = it[9]
    val sum = (0..8).map { i -> it[i] * (10 - i) }.sum() % 11
    return sum < 2 && check == sum || sum >= 2 && check + sum == 11
  }
}