Create 206-Reverse-Linked-List.js

Author: veerbia

javascript/206-Reverse-Linked-List.js

@@ -0,0 +1,23 @@
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val, next) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.next = (next===undefined ? null : next)
+ * }
+ */
+/**
+ * @param {ListNode} head
+ * @return {ListNode}
+ */
+var reverseList = function(head) {
+    let prev = null;
+    
+    while (head) {
+        let next = head.next;
+        head.next = prev;
+        prev = head;
+        head = next;
+    }
+    
+    return prev;
+};