Queue in JavaScript

Queue is an ADT (Abstract Data Type), which has the basic operations like enque/dequeue. Enqueue operation will insert an item to the queue. Dequeue will return the first inserted element. The constructor will accept max size for the queue. On overflow both enqueue & dequeue will return false.

function Queue(max){

  this.max = max;

}

Queue.prototype = (function(){

   var queue = [];

   return {

      enqueue: function(item){

         if(queue.length == this.max){

            return false;

         }

         queue.push(item);

      },

      dequeue: function(){

         if(queue.length == 0){

            return false;

         }

         return queue.shift();

      },

      isEmpty:function(){

         return queue.length == 0;

      }

   }

}

)();