stepper.js

// stepper.js
// 2015 cloudbender
// iojs 1.0.2
// generator works and steps itself, 
// from the event loop;

process.on( 'exit', function(){console.log('bye');} );

(function main(){

  // a generator constructor
  function* stepper(object) {
    yield setImmediate( function(me,ob){ ob.status='reset'; console.log(ob); me.next(); }, this,object );
    yield setImmediate( function(me,ob){ ob.status='step1'; console.log(ob); me.next(); }, this,object );
    yield setImmediate( function(me,ob){ ob.status='step2'; console.log(ob); me.next(); }, this,object );
    yield setImmediate( function(me,ob){ ob.status='stepN'; console.log(ob); me.next(); }, this,object );
    yield setImmediate( function(me,ob){ ob.status='ready'; console.log(ob); me.next(); }, this,object );
  }

  // create some objects
  var object1 = {'name':'object 1', 'status':'created'};
  var object2 = {'name':'object 2', 'status':'created'};
  var object3 = {'name':'object 3', 'status':'created'};

  // pass each object into a new stepper constructor
  // start each new stepper
  new stepper(object1).next(); 
  new stepper(object2).next(); 
  new stepper(object3).next();

  console.log('main completed');

})();