add: Reverse String

Author: hijiangtao

README.md

@@ -22,9 +22,12 @@ Progress: 20/
 |182|[Duplicate Emails](https://leetcode.com/problems/duplicate-emails/) | [SQL](./src/duplicate-emails/res.txt)|Easy|
 |183|[Customers Who Never Order](https://leetcode.com/problems/customers-who-never-order/) | [SQL](./src/customers-who-never-order/res.txt)|Easy|
 |184|[Department Highest Salary](https://leetcode.com/problems/department-highest-salary/) | [SQL](./src/department-highest-salary/res.txt)|Medium|
-|190|[Reverse Bits](https://leetcode.com/problems/reverse-bits/) | [JavaScript](./src/reverse-bits/res.txt)|Easy|
+|190|[Reverse Bits](https://leetcode.com/problems/reverse-bits/) | [JavaScript](./src/reverse-bits/res.js)|Easy|
 |196|[Delete Duplicate Emails](https://leetcode.com/problems/delete-duplicate-emails/) | [SQL](./src/delete-duplicate-emails/res.txt)|Easy|
 |197|[Rising Temperature](https://leetcode.com/problems/rising-temperature/) | [SQL](./src/rising-temperature/res.txt)|Easy|
+|206|[Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/) | [JavaScript](./src/reverse-linked-list/res.js)|Easy|
 |342|[Power of Four](https://leetcode.com/problems/power-of-four/) | [JavaScript](./src/power-of-four/res.js)|Easy|
+|344|[Reverse String](https://leetcode.com/problems/reverse-string/) | [JavaScript](./src/reverse-string/res.js)|Easy|
 |404|[Sum of Left Leaves](https://leetcode.com/problems/sum-of-left-leaves/) | [JavaScript](./src/sum-of-left-leaves/res.js)|Easy|
 |434|[Number of Segments in a String](https://leetcode.com/problems/number-of-segments-in-a-string/) | [JavaScript](./src/number-of-segments-in-a-string/res.js)|Easy|
+||[]() | [](./src//res.js)|Easy|

src/reverse-linked-list/res.js

@@ -0,0 +1,36 @@
+/**
+ * Reverse a singly linked list.
+ * 
+ * res.js
+ * @authors Joe Jiang ([email protected])
+ * @date    2017-02-25 21:12:51
+ * @version $Id$
+ */
+
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val) {
+ *     this.val = val;
+ *     this.next = null;
+ * }
+ */
+/**
+ * @param {ListNode} head
+ * @return {ListNode}
+ */
+let reverseList = function(head) {
+    if (!head) {
+        return head;
+    }
+    
+    let res = new ListNode(head.val);
+    
+    while (head.next) {
+        let temp = res;
+        res = new ListNode(head.next.val);
+        res.next = temp;
+        head = head.next;
+    }
+    
+    return res;
+};

src/reverse-string/res.js

@@ -0,0 +1,26 @@
+// Write a function that takes a string as input and returns the string reversed.
+
+// Example:
+// Given s = "hello", return "olleh".
+
+/**
+ * res.js
+ * @authors Joe Jiang ([email protected])
+ * @date    2017-02-25 21:23:03
+ * @version $Id$
+ */
+
+/**
+ * @param {string} s
+ * @return {string}
+ */
+let reverseString = function(s) {
+    let res = '';
+    
+    while (s) {
+        res = s.charAt(0)+res;
+        s = s.substring(1);
+    }
+    
+    return res;
+};