update: detect loop in Linked List

Author: ashokdey

README.md

@@ -12,6 +12,7 @@ Collection of interview questions with Unit Tests. Problems includes Data Struct
 - [Singly Linked List](src/_DataStructures_/LinkedList)
   - [N Element From Last](src/_DataStructures_/LinkedList/element-from-last)
   - [Middle Node](src/_DataStructures_/LinkedList/middle-node)
+  - [Detect Loop](src/_DataStructures_/LinkedList/loop-in-list)
 - [Stack](src/_DataStructures_/Stack)
   - [Implement Queue Using Stack](src/_DataStructures_/Stack/immitate-queue-using-stack)
   - [Baseball Game](src/_DataStructures_/Stack/baseball-game)

src/_DataStructures_/LinkedList/loop-in-list/index.js

@@ -0,0 +1,16 @@
+// Floyd’s Cycle-Finding Algorithm
+
+function detechLoop(linkedList) {
+  let slow = linkedList.getFirst();
+  let fast = linkedList.getFirst();
+
+  while (fast.next && fast.next.next) {
+    slow = slow.next;
+    fast = fast.next.next;
+
+    if (slow === fast) {
+      return true;
+    }
+  }
+  return false;
+}