Optimal Division.js

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

	return nums.reduce((result, num, index) => {
		if (index === 0) return `${num}/(`;
		if (index === length - 1) return result + `${num})`;
		return result + `${num}/`;
	}, '');
};