Time: 50 ms (98.26%), Space: 53 MB (58.37%) - LeetHub

Author: chappdev2019

0141-linked-list-cycle/0141-linked-list-cycle.js

@@ -0,0 +1,23 @@
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val) {
+ *     this.val = val;
+ *     this.next = null;
+ * }
+ */
+
+/**
+ * @param {ListNode} head
+ * @return {boolean}
+ */
+var hasCycle = function (head) {
+
+    let slow = head;
+    let fast = head;
+    while (slow != null && fast!=null && fast.next != null) {
+        slow = slow.next;
+        fast = fast.next.next;
+        if (slow == fast) return true;
+    }
+    return false;
+};