1
var optimalDivision = function (nums) {
2
  const { length } = nums;
3
  if (length === 1) return `${nums[0]}`;
4
  if (length === 2) return nums.join("/");
5

6
  return nums.reduce((result, num, index) => {
7
    if (index === 0) return `${num}/(`;
8
    if (index === length - 1) return result + `${num})`;
9
    return result + `${num}/`;
10
  }, "");
11
};