collections.js
function Node(value, prev, next) {
    this.value = value;
    this.prev = prev;
    this.next = next;
  }
function Node(value, prev, next) {
    this.value = value;
    this.prev = prev;
    this.next = next;
  }
function Node ( value , prev , next ) { this . value = value ; this . prev = prev ; this . next = next ; }
A doubly linked node
A doubly linked node