// insert an item at the position specified LinkedList.prototype.insert = function(data, position) { let newNode = new Node(data); //instantiate a new node if (position < 0 || position > this.size) { // if the position is less than zero or greater than the size of the linked list itself return 'Please enter a valid position.' // return error statement } else { if (this.head === null) { // if we do not have any nodes in the list) this.head = newNode; // point newNode's pointer to the head this.tail = newNode; // point the head pointer to the newNode; } else { let prev = null; // set up a variable to hold the prev value let curr = this.head; // set a current variable to this.head (the start) let currIndex = 0; while (currIndex < position) { // while the current index we're at is less than the position, we need to keep iterating prev = curr; // set prev variable equal to curr curr = curr.next; // skip to next node until we find the right position } newNode.next = curr; // after we find the position, set the new node's next to equal the current prev.next = newNode; // also set the previous node's next to equal the new node } this.size++; } } console.log(myList) myList.insert(4,1) console.log(myList)