Luhn Check function in JavaScript for credit card validation

luhnCheck.js

const map = [0, 2, 4, 6, 8, 1, 3, 5, 7, 9]

const luhnCheck = (input) => {
  const number = String(input).replace(/\D/g, '')
  let sum = 0
  let digit = 0
  let i = number.length
  let even = true

  while (i) {
    i -= 1
    digit = parseInt(number[i], 10)
    even = !even
    sum += even ? map[digit] : digit
  }

  return sum > 0 && sum % 10 === 0
}

export default luhnCheck