Sort array object using a key

array_sort

let arr = [
  { 
    name: "chibuzo",
    rank: 3
  },
  { 
    name: "John",
    rank: 1
  },
  {
    name: "Sione",
    rank: 2
  }
];

function sortArray(users) {
  return users.sort((a, b) => parseInt(a.rank) - parseInt(b.rank));
}


function findArrayAverage(users) {
  let sum = 0;
  users.forEach(user => {
    sum += user.rank;
  });
  
  return sum / users.length;
}