Detect Capital LeetCode solution in JavaScript

1
var detectCapitalUse = function (word) {
2
  if (
3
    (word.charAt(0) == word.charAt(0).toUpperCase() &&
4
      word.slice(1) == word.slice(1).toLowerCase()) ||
5
    word == word.toUpperCase() ||
6
    word == word.toLowerCase()
7
  ) {
8
    return true;
9
  } else {
10
    return false;
11
  }
12
};