Suggested solution for Data Structures: Create a Doubly Linked List

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1

What is your hint or solution suggestion?

var Node = function(data, prev) {
  this.data = data;
  this.prev = prev;
  this.next = null;
};
var DoublyLinkedList = function() {
  this.head = null;
  this.tail = null;

  this.add = (element) => {
    const newNode = new Node(element, null);
    if (this.head === null) {
      this.head = newNode;
      this.tail = newNode;
    } else {
      newNode.prev = this.tail;
      newNode.prev.next = newNode;
      this.tail = newNode;
    }
  };

  this.remove = (element) => {
    let currentNode = this.head;
    let prevNode = null;
    let nextNode = null;

    if (this.head === null) {
      return null;
    }

    while (currentNode) {
      if (currentNode.data !== element) {
        currentNode = currentNode.next;
        continue;
      }

      prevNode = currentNode.prev;
      nextNode = currentNode.next;

      if (currentNode === this.head) {
        this.head = nextNode;
      } else {
        prevNode.next = nextNode;
      }

      if (currentNode === this.tail) {
        this.tail = prevNode;
      } else {
        nextNode.prev = prevNode;
      }

      currentNode = currentNode.next;
    }
  };
};

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