Add solution #344

Author: JoshCrozier

README.md

@@ -101,6 +101,7 @@
 283|[Move Zeroes](./0283-move-zeroes.js)|Easy|
 326|[Power of Three](./0326-power-of-three.js)|Easy|
 342|[Power of Four](./0342-power-of-four.js)|Easy|
+344|[Reverse String](./0344-reverse-string.js)|Easy|
 345|[Reverse Vowels of a String](./0345-reverse-vowels-of-a-string.js)|Easy|
 347|[Top K Frequent Elements](./0347-top-k-frequent-elements.js)|Medium|
 349|[Intersection of Two Arrays](./0349-intersection-of-two-arrays.js)|Easy|

solutions/0344-reverse-string.js

@@ -0,0 +1,20 @@
+/**
+ * 344. Reverse String
+ * https://leetcode.com/problems/reverse-string/
+ * Difficulty: Easy
+ *
+ * Write a function that reverses a string. The input string is given as an array
+ * of characters s.
+ *
+ * You must do this by modifying the input array in-place with O(1) extra memory.
+ */
+
+/**
+ * @param {character[]} s
+ * @return {void} Do not return anything, modify s in-place instead.
+ */
+var reverseString = function(s) {
+  for (let i = 0; i < Math.floor(s.length / 2); i++) {
+    [s[s.length - 1 - i], s[i]] = [s[i], s[s.length - 1 - i]];
+  }
+};