1var searchRange = function(nums, target) {
2    const findFirst = (nums, target) => {
3        let left = 0, right = nums.length - 1, result = -1;
4        while (left <= right) {
5            const mid = left + Math.floor((right - left) / 2);
6            if (nums[mid] >= target) {
7                if (nums[mid] === target) result = mid;
8                right = mid - 1;
9            } else {
10                left = mid + 1;
11            }
12        }
13        return result;
14    };
15    
16    const findLast = (nums, target) => {
17        let left = 0, right = nums.length - 1, result = -1;
18        while (left <= right) {
19            const mid = left + Math.floor((right - left) / 2);
20            if (nums[mid] <= target) {
21                if (nums[mid] === target) result = mid;
22                left = mid + 1;
23            } else {
24                right = mid - 1;
25            }
26        }
27        return result;
28    };
29    
30    return [findFirst(nums, target), findLast(nums, target)];
31};