ranking.js

const people = [
	{ name: "John",    ranking: 3 },
	{ name: "Jane",    ranking: 8 },
	{ name: "Joe",     ranking: 2 },
	{ name: "Jessica", ranking: 9 },
];

console.log("average", rank_avg(people));
console.log("sorted", rank_sort(people).map((person) => (person.name)));

function rank_sort(people) {
	// ascending
	return people.sort((person1, person2) => {
		return person1.ranking - person2.ranking;
	})
}

function rank_avg(people) {
	// ascending
	return people.reduce((rank, person) => (rank + person.ranking), 0) / people.length;
}