Pair wise swap

Data-Structures/Linked-List/pairWiseSwap.js

@@ -0,0 +1,50 @@
+
+//problem link leetcode:https://leetcode.com/problems/swap-nodes-in-pairs/
+class Node {
+    constructor(data) {
+        this.data = data;
+        this.next = null;
+    }
+}
+
+class LinkedList {
+    constructor(listOfValues) {
+        this.headNode = null;
+        this.tailNode = null;
+        this.length = 0;
+
+        if (listOfValues instanceof Array) {
+            for (const value of listOfValues) {
+                this.addLast(value);
+            }
+        }
+    }
+
+    pairwiseSwap() {
+        let current = this.headNode;
+        let prev = null;
+
+        while (current && current.next) {
+            const nextNode = current.next;
+            const nextNextNode = nextNode.next;
+
+            nextNode.next = current;
+            current.next = nextNextNode;
+
+            if (prev) {
+                prev.next = nextNode;
+            } else {
+                this.headNode = nextNode;
+            }
+
+            prev = current;
+            current = nextNextNode;
+        }
+
+        if (prev) {
+            this.tailNode = prev;
+        }
+    }
+}
+
+export { Node, LinkedList };