A function for array of objects sorting.

sort-array-object.js

Array.prototype.sortBy = function(key, ascending = true) {
  return this.sort((a, b) => {
    if (ascending) {
      return a[key] > b[key] ? 1 : a[key] < b[key] ? -1 : 0;
    } else {
      return a[key] > b[key] ? -1 : a[key] < b[key] ? 1 : 0;
    }
  });
};
var arr = [
  { name: "Kubar", age: 38, signedUpAt: new Date("April 3, 2008") },
  { name: "Rudy", age: 2, signedUpAt: new Date("May 25, 2018") },
  { name: "Okan", age: 37, signedUpAt: new Date("June 12, 1998") }
];

arr.sortBy("age",false);
arr.sortBy("name");
arr.sortBy("signedUpAt",false);