0520--detect-capital.js

// 520. Detect Capital

// 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.

// Examples
// Input: word = "USA";
// Output: true;
// Input: word = "FlaG";
// Output: false;

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

/**
 * @param {string} word
 * @return {boolean}
 */
var detectCapitalUse = function (word) {
  return (
    word === word.toUpperCase() ||
    word === word.toLowerCase() ||
    (word.length > 1 &&
      word === word[0].toUpperCase() + word.slice(1).toLowerCase())
  );
};