Ordering and Rankings

ordering-and-rankings.js

function inRankingOrder(arr) {
  return arr.sort((obj1, obj2) => {
    const ranking1 = obj1.ranking,
          ranking2 = obj2.ranking;
    return ranking1 < ranking2 ? -1 : (ranking1 > ranking2 ? 1 : 0);
  });
}

function averageRanking(arr) {
  const sum = arr.map(obj => obj.ranking).
                reduce((num1, num2) => num1 + num2);
  return sum / arr.length;
}

const array = [
  { name: 'John', ranking: 5 },
  { name: 'Victor', ranking: 7 },
  { name: 'Joy', ranking: 7 },
  { name: 'Melbury', ranking: 4 }
];

console.log(inRankingOrder(array));
console.log(averageRanking(array));