Singly Linked List implementation in JavaScript

singly-linked-list.js

var Node = function(value) {
  var node = {};
  node.value = value;
  node.next = null;
  return node;
};

var LinkedList = function() {
  var list = {};
  list.head = null;
  list.tail = null;

  list.addToTail = function(value) {
    var node = Node(value);
    if (!list.head) {
      list.head = node;
      list.tail = node;
    } else {
      list.tail.next = node;
      list.tail = node;
    }
  };

  list.removeHead = function() {
    var oldHead = list.head;
    list.head = oldHead.next;
    return oldHead.value;
  };

  list.contains = function(target) {
    var current = list.head;
    while (current) {
      if (current.value === target) return true;
      current = current.next;
    }
    return false;
  };

  return list;
};