added removeDuplicatesFromSortedLinkedList easy leetcode solution

Author: DevDelvo

dataStructures/Linked List/removeDuplicatesFromSortedLinkedList.js

@@ -0,0 +1,28 @@
+const LinkedList = require('./linkedList');
+
+// Given a sorted linked list, delete all duplicates such that each element appear only once.
+// Example 1:
+// Input: 1->1->2
+// Output: 1->2
+// Example 2:
+// Input: 1->1->2->3->3
+// Output: 1->2->3
+
+const linkedList = new LinkedList(1).addValues([1,2]);
+const linkedList2 = new LinkedList(1).addValues([1,2,3,3]);
+
+const removeDuplicates = (head) => {
+    if (!head) return head;
+    let current = head;
+    while (current.next) {
+        if (current.value === current.next.value) {
+                current.next = current.next.next;
+        } else {
+            current = current.next;
+        }
+    }
+    return head;
+}
+
+console.log(removeDuplicates(linkedList));
+console.log(removeDuplicates(linkedList2));