JS Linked list

linkedlist.js

{

    function LinkedList() {
        this.head = null;
        this.tail = null;
    }
    function Node(value, next, prev) {
        this.value = value;
        this.next = next;
        this.prev = prev;
    }
    LinkedList.prototype.addToHead = function(value) {
        const newNode = new Node(value,this.head,null);
        if (this.head)
            this.head.prev = newNode;
        else
            this.tail = newNode;
        this.head = newNode;
    }
    LinkedList.prototype.addToTail = function(value) {
        const newNode = new Node(value,null,this.tail);
        if (this.tail)
            this.tail.next = newNode;
        else
            this.head = newNode;
        this.tail = newNode;
    }
    LinkedList.prototype.removeHead = function() {
        if (!this.head)
            return null;
        let value = this.head.value;
        this.head = this.head.next;

        if (this.head)
            this.head.prev = null;
        else
            this.tail = null;

        return value;
    }
    LinkedList.prototype.search = function(searchValue) {
        let currentNode = this.head;

        while (currentNode) {
            if (currentNode.value === searchValue)
                return currentNode;
            currentNode = currentNode.next;
        }
        return null;
    }

    const list = new LinkedList();
    list.addToHead(100);
    list.addToTail(200);
    list.addToHead(300);
    console.log(list.search(100)); // true
    console.log(list.search(300)); // true
    console.log(list.search(1)); // true

    console.log(list);

}