Validate Iranian national code in JavaScript - بررسی صحت کد ملی در جاوا اسکریپت

validate-national-code.js

// C# version -> https://gist.github.com/dehghani-mehdi/2af3d913786d8b1b286f9c28cc75d5f4

var isValidNationalCode = function(code) {
    if (code.length !== 10 || /(\d)(\1){9}/.test(code)) return false;

    var sum = 0,
        chars = code.split(''),
        lastDigit,
        remainder;

    for (var i = 0; i < 9; i++) sum += +chars[i] * (10 - i);
    
    remainder = sum % 11;
    lastDigit = remainder < 2 ? remainder : 11 - remainder;

    return +chars[9] === lastDigit;
};

// ES6 version
const isValidNationalCode = code => {
    if (code.length !== 10 || /(\d)(\1){9}/.test(code)) return false;

    let sum = 0,
        chars = code.split(''),
        lastDigit,
        remainder;

    for (let i = 0; i < 9; i++) sum += +chars[i] * (10 - i);
    
    remainder = sum % 11;
    lastDigit = remainder < 2 ? remainder : 11 - remainder;

    return +chars[9] === lastDigit;
};

// usage
isValidNationalCode('0060647531');

Thanks, safe my day, and better code is:
const isValidNationalCode = value => {
if (value.length !== 10 || /(\d)(\1){9}/.test(value)) return false;

let sum = 0;
const chars = value.split('');

for (let i = 0; i < 9; i += 1) sum += +chars[i] * (10 - i);

let lastDigit = null;
const remainder = sum % 11;

lastDigit = remainder < 2 ? remainder : 11 - remainder;

return +chars[9] === lastDigit;

};

thanks mr abbasmoosavi,I think yon can write better code in for loop:

for (let i = 0; i < 9; i++) sum += +chars[i] * (10 - i);