solve: 206. Reverse Linked List

Runtime: 52 ms, faster than 87.95% of JavaScript online submissions for Reverse Linked List.
Memory Usage: 52 MB, less than 37.51% of JavaScript online submissions for Reverse Linked List.

Author: sounmind

reverse-linked-list/evan.js

@@ -0,0 +1,25 @@
+/**
+ * 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 currentNode = head;
+  let previousNode = null;
+
+  while (currentNode !== null) {
+    const nextNode = currentNode.next;
+
+    currentNode.next = previousNode;
+    previousNode = currentNode;
+    currentNode = nextNode;
+  }
+
+  return previousNode;
+};