JavaScript/Maths/DigitSum.js

// program to find sum of digits of a number

// function which would calculate sum and return it
const digitSum = (num) => {
  // sum will store sum of digits of a number
  let sum = 0
  // while will run until num become 0
  while (num) {
    sum += num % 10
    num = parseInt(num / 10)
  }

  return sum
}

export { digitSum }