Add currentNode variable to Remove Element from a linked list (#25131)

curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-elements-from-a-linked-list.english.md

@@ -46,7 +46,7 @@ tests:
 function LinkedList() {
   var length = 0;
   var head = null;
-
+  var currentNode = null;
   var Node = function(element){
     this.element = element;
     this.next = null;