Add solution #520

Author: JoshCrozier

README.md

@@ -131,6 +131,7 @@
 476|[Number Complement](./0476-number-complement.js)|Easy|
 500|[Keyboard Row](./0500-keyboard-row.js)|Easy|
 506|[Relative Ranks](./0506-relative-ranks.js)|Easy|
+520|[Detect Capital](./0520-detect-capital.js)|Easy|
 541|[Reverse String II](./0541-reverse-string-ii.js)|Easy|
 542|[01 Matrix](./0542-01-matrix.js)|Medium|
 551|[Student Attendance Record I](./0551-student-attendance-record-i.js)|Easy|

solutions/0520-detect-capital.js

@@ -0,0 +1,21 @@
+/**
+ * 520. Detect Capital
+ * https://leetcode.com/problems/detect-capital/
+ * Difficulty: Easy
+ *
+ * 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.
+ */
+
+/**
+ * @param {string} word
+ * @return {boolean}
+ */
+var detectCapitalUse = function(word) {
+  return /^[A-Z]?[a-z]+$|^[A-Z]+$/.test(word);
+};