Prevent an object key from appearing in `Object.keys()` or `for..in` loop

The Object.keys() method returns an array of a given object's own enumerable property names, iterated in the same order that a normal loop would.

const object1 = {
  a: 'somestring',
  b: 42,
  c: false
};

console.log(Object.keys(object1));
// expected output: Array ["a", "b", "c"]

let unorderedData = {
  real_name: 'Millie Bobby Brown',
  character_name: 'Eleven',
  series: 'Stranger Things'
};
console.log(JSON.stringify(unorderedData));

const orderedData = {};
Object.keys(unorderedData).sort().forEach(function(key) {
  orderedData[key] = unorderedData[key];
});

console.log(JSON.stringify(orderedData));