let arrOfObjects = [{ name: "Dave", ranking: 2 }, { name: "Steve", ranking: 1 }, { name: "Daniel", ranking: 34 }, { name: "Solange", ranking: 523 }];

function returnByRanking(){
    //returning ranked objects in the sorted array

    return arrOfObjects.sort((a, b) => {
        return a.ranking - b.ranking;
    });
}

function returnAverageRanking(){
    let average = arrOfObjects.reduce((accumulator, currentValue) => accumulator + currentValue.ranking, 0);

    return average/arrOfObjects.length;
}