reverse-linked-list solution

Author: krokerdile

reverse-linked-list/krokerdile.js

@@ -0,0 +1,24 @@
+/**
+ * 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}
+ */
+function reverseList(head) {
+    let prev = null;
+    let curr = head;
+
+    while (curr !== null) {
+        let nextTemp = curr.next;
+        curr.next = prev;
+        prev = curr;
+        curr = nextTemp;
+    }
+
+    return prev; // prev는 새로운 head
+}