Count of Matches in Tournament LeetCode solution in JavaScript

1
/**
2
 * @param {number} n
3
 * @return {number}
4
 */
5
var numberOfMatches = function (n) {
6
  let matches = 0,
7
    current = n;
8
  while (current > 1) {
9
    if (current % 2 === 0) {
10
      matches += current / 2;
11
      current = current / 2;
12
    } else {
13
      matches += (current - 1) / 2;
14
      current = (current - 1) / 2 + 1;
15
    }
16
  }
17
  return matches;
18
};