Leetcode•Apr 19, 2025

Detect Capital

Hazrat Ali

Leetcode

We define the usage of capitals in a word to be right when one of the following cases holds:

  • All letters in this word are capitals, like "USA".
  • All letters in this word are not capitals, like "leetcode".
  • Only the first letter in this word is capital, like "Google".

Given a string word, return true if the usage of capitals in it is right.

 

Example 1:

Input: word = "USA"
Output: true

Example 2:

Input: word = "FlaG"
Output: false

 

Constraints:

  • 1 <= word.length <= 100
  • word consists of lowercase and uppercase English letters.

 

Solution 

/**
 * @param {string} word
 * @return {boolean}
 */
const detectCapitalUse = word => {
  let count = 0;

  for (let c of word) {
    if (c === c.toUpperCase()) {
      count++;
    }
  }

  return count === 0 || count === word.length || (count === 1 && word[0] === word[0].toUpperCase());
};

 

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