// Example -
// { category: 'Cloths', 'brand': 'Van H', collection: 'New' }.sortObject(['brand', 'category', 'collection']);
Object.prototype.sortObject = function(sortingArr) {
  var targetObj = this;
  var result = {}
  if (!targetObj) {
    return result;
  }
  sortingArr = sortingArr || []
  var sortedKeys = Object.keys(targetObj).sort(function(a, b) {
    return sortingArr.indexOf(a) - sortingArr.indexOf(b);
  });
  sortedKeys.forEach(function(key) {
    result[key] = targetObj[key];
  })
  return result;
};