Number of Smooth Descent Periods of a Stock LeetCode solution in JavaScript

1
var getDescentPeriods = function (prices) {
2
  const n = prices.length;
3

4
  let left = 0;
5
  let totRes = 0;
6

7
  while (left < n) {
8
    let count = 1;
9

10
    let right = left + 1;
11

12
    while (right < n && prices[right] + 1 === prices[right - 1]) {
13
      count += right - left + 1;
14
      ++right;
15
    }
16

17
    totRes += count;
18

19
    left = right;
20
  }
21

22
  return totRes;
23
};