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

For Javascript Developers:

const checkCodeMeli = code => {
    console.log("an");
    var L = code.length;

    if (L < 8 || parseInt(code, 10) === 0) return false;
    code = ("0000" + code).substr(L + 4 - 10);
    if (parseInt(code.substr(3, 6), 10) === 0) return false;
    var c = parseInt(code.substr(9, 1), 10);
    var s = 0;
    for (var i = 0; i < 9; i++) {
      s += parseInt(code.substr(i, 1), 10) * (10 - i);
    }
    s = s % 11;
    return (s < 2 && c === s) || (s >= 2 && c === 11 - s);
  };