Queue: Execute methods in order.

queue.js

var queue = function(){

  var self = this;
  self.free  = true;
  self.chain = [];
  
  self.next  = function(){
    if(self.chain.length > 0){
      self.free = true;
      self.chain[0].call();
      self.chain.shift();
    }
  };
  
  self.route = function(pass, queue){
    if(self.free){
      pass();
      self.free = false;
    }
    else {
      queue();
    }
  };
  
};