let vasya = { name: "Вася", age: 25 };
let petya = { name: "Петя", age: 15 };
let masha = { name: "Маша", age: 28 };

let arrObj = [vasya, petya, masha];

function sortByName(mas) {
  mas.sort((a, b) => {
    if (a.name > b.name) {
      return 1;
    }
    if (a.name < b.name) {
      return -1;
    }
    return 0;
  });

}

function sortByAge(mas) {
  mas.sort((a, b) => a.age - b.age);
}

console.log(arrObj[0].name, arrObj[1].name, arrObj[2].name);
sortByName(arrObj);
console.log(arrObj[0].name, arrObj[1].name, arrObj[2].name);
sortByAge(arrObj);
console.log(arrObj[0].name, arrObj[1].name, arrObj[2].name);