DetectCapital.js

// Source : https://leetcode.com/problems/detect-capital
// Author : Dean Shi
// Date   : 2017-03-05

/***************************************************************************************
 *
 * Given a word, you need to judge whether the usage of capitals in it is right or not.
 *
 * 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 if it has more than one letter, like
 * "Google".
 *
 * Otherwise, we define that this word doesn't use capitals in a right way.
 *
 * Example 1:
 *
 * Input: "USA"
 * Output: True
 *
 * Example 2:
 *
 * Input: "FlaG"
 * Output: False
 *
 * Note:
 * The input will be a non-empty word consisting of uppercase and lowercase latin
 * letters.
 *
 *
 ***************************************************************************************/

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