var object_size = function(obj) {
    var size = 0, key;
    for (key in obj) {
        if (obj.hasOwnProperty(key)) size++;
    }
    return size;
};

var myObj = {
  'a': [{'start': '011', 'end': '012'}],
  'b': [{'start': '021', 'end': '022'}],
  'c': [{'start': '031', 'end': '032'}],
  'd': [{'start': '041', 'end': '042'}],
};

var keys = Object.keys( myObj );
var num = object_size(myObj);
console.log(num);

for(var i = 0; i < num; i++ ) {
  var tt = i%object_size(myObj);
  var myObjArray = ['a','b','c','d'];

  console.log(keys[tt]);
  console.log('/*********************/');
//   console.log(myObj[keys[tt]]);

  if (myObjArray.indexOf(keys[tt]) > -1) {
      var popIndex = myObjArray.indexOf(keys[tt]);
       myObjArray.splice(popIndex, 1);
  }
  console.log(myObjArray);
  for (var k = 0; k < myObjArray.length; k++) {
    var index = myObjArray[k];
    console.log(index);
    console.log(myObj[index]);
  }
  console.log('/*********************/');
}