DTX

В гугле что на английском что на русском не нашел точной инфы на данный вопрос

Luhn algorithm 19

Good news is that the Luhn algorithm is not limited by the number of digits and can handle checks greater (and smaller) than 16 digits.

var scrollPos = window.scrollY || window.scollTop || document.getElementsByTagName("html")[0].scrollTop;

if (scrollPos + window.innerHeight > el.centerY) addAnimation()

process.on('uncaughtException', err => {
    console.error(err)
    process.exit()
})

function arrayMin(arr) {
  return arr.reduce(function (p, v) {
    return ( p < v ? p : v );
  });
}

function arrayMax(arr) {
  return arr.reduce(function (p, v) {
    return ( p > v ? p : v );
  });
}

var array = [ 
 { base : 10, upOne: 2, upTwo: 5, upThree: 9}, // 26
 { base : 14, upOne: 1, upTwo: 3, upThree: 5}, // 23
 { base : 11, upOne: 2, upTwo: 3, upThree: 9} // 25
 ]

let selected = ['upOne', 'upTwo']

let getSum = (el) => {
  let r = el.base
  selected.forEach(i => r+= el[i])
  return r
}

function arrayMin(arr) {
  return arr.reduce(function (i, ac) {
    return ( getSum(i) < getSum(ac) ? i : ac );
  });
}

console.log(arrayMin(array))

async function test(v) {
  return new Promise(resolve => {
    setTimeout(() => {
      console.log(v);
      resolve();
    }, 2000);
  });
}

console.log('Start');
test(1);
console.log(2);

async function test2() {
  await test(3);
  console.log(4);
}

test2();

//2
//1
//3
//4

function checkLeadingZeros(a) {
  let str = a.toString()
  if ((+str).toString().length !== str.length)
    console.log("Все плохо");
  else
    console.log("Всё хорошо");
}

checkLeadingZeros(8);
checkLeadingZeros("8");
checkLeadingZeros("08");

//Всё хорошо
//Всё хорошо
//Все плохо