(function() {
  var createWorker = function() {

    var workCount = 0;

    var task1 = function() {
      workCount += 1;
      console.log('Doing task2 :' + workCount);
    }
    var task2 = function() {
      workCount += 1;
      console.log('Doing task1 :' + workCount);
    }

    return {
      job1: task1,
      job2: task2
    };
  };

  var worker = createWorker();
  worker.job1();
  worker.job2();
  worker.job1();
  worker.job2();

}());