arrayCalculation.js

const arrayCalculation = (specialArray, depth = 1) => {
  const r = []
  specialArray.forEach((e) => {
    if (Number.isInteger(e))
      r.push(e)
    
    if (Array.isArray(e))
      r.push(arrayCalculation(e, depth + 1))
  })
  return depth * r.reduce((acc, cv) => acc + cv, 0)
}
// [2, [4, 6]] => 2 + 2 * (4 + 6) = 22
// [5, [[7], 3] => 5 + 2 * (3 * 7 + 3) = 53