Sort plain js object based on custom order from Array

sortObject.js

// Example - 
// { category: 'Cloths', 'brand': 'Van H', collection: 'New' }.sortObject(['brand', 'category', 'collection']);
var sortingBasedOnArr = ['collection', 'brand', 'category'];
var targetObject = { category: 'Cloths', 'brand': 'Van H', collection: 'New' }

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;
};
// To call
var sorted = Object.prototype.sortObject.call(targetObject, sortingBasedOnArr);

// Method - 2
// Sort based on custom order
var sortedKeys = Object.keys(targetObject).sort(function(a, b) {
  return sortingBasedOnArr.indexOf(a) - sortingBasedOnArr.indexOf(b);
});
// Loop over keys
sortedKeys.forEach(function(key) {
  var value = targetObject[key];
  // Perform operations
});