/*
    author: Theepag
 */
const factorialize = (num) => {
  // Step 1. variable result to store num
  let result = num
  // If num = 0 OR 1, the factorial will return 1
  if (num === 0 || num === 1) { return 1 }
  // Step 2. WHILE loop
  while (num > 1) {
    num-- // decrement 1 at each iteration
    result = result * num // or result = result * num;
  }
  // Step 3. Return the factorial
  return result
}
// test
console.log(factorialize(5))
console.log(factorialize(4))