Generate identity number for Republic of Turkey

tc-kimlik.js

const generateNumber = (min, max) => {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

const generateIdentityNumber = () => {
  const identityNumber = [];

  for (let index = 0; index < 9; index++) {
    const minNumber = index === 0 ? 1 : 0;
    identityNumber[index] = generateNumber(minNumber, 9);
  }

  const oddNumbers = identityNumber.filter((value, index) => index % 2 === 0);
  const evenNumbers = identityNumber.filter((value, index) => index % 2 === 1);

  const oddNumbersTotal = oddNumbers.reduce((totalValue, currentValue) => totalValue + currentValue, 0);
  const evenNumbersTotal = evenNumbers.reduce((totalValue, currentValue) => totalValue + currentValue, 0);

  identityNumber[9] = (oddNumbersTotal * 7 - evenNumbersTotal) % 10;

  const totalForLastItem = oddNumbersTotal + evenNumbersTotal + identityNumber[9];
  identityNumber[10] = totalForLastItem % 10;

  return identityNumber.join('');
}

const identityNumber = generateIdentityNumber();

console.log(`Generated identity number is ${identityNumber}`);