sort-parcels-by-country.js

// given a database of global parcels like this...
const allGlobalParcels = [
  {
    created: 576424800000,
    location: "aus",
    properties: { ... },
  },
  {
    created: 1558163267311,
    location: "us",
    properties: { ... },
  },
  ...2701201201 more items
];

const sortParcelsByCountry = (parcels, country, order) => {
  // 1. Filter our list to only include parcels from 'country;
  const countryParcels = parcels.filter(parcel => parcel.location === country);

  // 2. Sort the list of parcels by date created
  const sortedResult = [...countryParcels].sort((a, b) => {
    if (order === "ascending") return a.created - b.created;
    // by default return packages by descending order
    return b.created - a.created;
  });

  return sortedResult;
};

const ausParcelsAsc = sortParcelsByCountry(allGlobalParcels, "aus", "ascending");
const ausParcelsDsc = sortParcelsByCountry(allGlobalParcels, "aus", "descending");