code: function() {
        var context = this,
            args = _makeArray(arguments),
            fun  = args.shift();
  
        if (_isArray(args[0])) { args = args[0]; }
  
        return this.then(function(content) {
          args.push(function(response) { context.next(response); });
          context.wait();
          fun.apply(fun, args);
          return false;
        });
      }
docs: defers the call of function to occur in order of the render queue. The function can accept any number of arguments as long as the last argument is a callback function. This is useful for putting arbitrary asynchronous functions into the queue. The content passed to the callback is passed as `content` to the next item in the queue.  === Example  this.send($.getJSON, '/app.json') .then(function(json) { $('#message).text(json['message']); });