NodeJS extra arg

gistfile1.js

    doTwitterCall: function (extraArg, err, result) {

      //MOAR code here etc.
      //extraArg is available here with a value of 'foo'
      //return result


    },

    getResults: function (err, result) {

        this.job_id = this.req.params.jobid;
        var that = this;
        that.result = result;

        var extraArg = "foo";
        this.model2.findOne(
            {
                'user': this.req.user,
                'job_id': job_id,
                'social_network_id': 2
            })
            //
            .sort({date: 'asc'})
            .exec(this.doTwitterCall.bind(this,extraArg));
    }