Sort through an array of objects using a specified sort function.

advancedSortFunction.js

const students = [
  { id: 1, name: "bruce", age: 40 },
  { id: 2, name: "zoidberg", age: 22 },
  { id: 3, name: "alex", age: 22 },
  { id: 4, name: "alex", age: 30 }
];
const students2 = [
  { id: 1, name: "Frank", age: 100 },
  { id: 2, name: "Jay", age: 22 },
  { id: 3, name: "Frank", age: 22 },
  { id: 4, name: "Frank", age: 30 },
  { id: 5, name: "Jay", age: 10 },
  { id: 6, name: "Alex", age: 100 }
];

const sortAdv = function(a,b) {
  if (a.name < b.name) {
    return -1;
  } else if (a.name > b.name) {
    return 1;
  } else if (a.age > b.age) {
    return -1;
  } else if (a.age < b.age) {
    return 1;
  } else {
    return 0;
  }
};

students.sort((a,b) => sortAdv(a,b));
students2.sort((a,b) => sortAdv(a,b));
console.log(students);
console.log(students2);

// Legacy code that works with proper syntax but can only be used once. 
// let studentsSorted = students.sort((a, b) => {
//   if (a.name < b.name) {
//     return -1;
//   } else if (a.name > b.name) {
//     return 1;
//   } else if (a.age > b.age) {
//     return -1;
//   } else if (a.age < b.age) {
//     return 1;
//   } else {
//     return 0;
//   }
// }
// );