avg_sort_rankings.js

function sortByRanking(rankingArray){
	function compare(a,b) {
	  if (a.ranking < b.ranking)
	    return -1;
	  if (a.ranking > b.ranking)
	    return 1;
	  return 0;
	}

	return rankingArray.sort(compare)
}



function avgRanking(rankingArray){
	return rankingArray.reduce(function(memo , next){
		return memo + next.ranking
	} , 0) / rankingArray.length
}