Javascript Objects by Rank

gistfile1.txt

function objectsByRanking(data) {
  return data.sort(function(a, b) { return a.ranking - b.ranking; })
}

function averageRanking(data) {
  return data.reduce(
    function(prev, curr) { return { ranking: prev.ranking + curr.ranking }; }, { ranking: 0 }
  ).ranking / data.length;
}

function Item(name, ranking) {
  this.name = name;
  this.ranking = ranking;
}

var array = [
  new Item('ala', 6),
  new Item('ma', 8),
  new Item('kota', 9),
  new Item('zuzia', 7),
  new Item('posiada', 5),
  new Item('pieska', 1),
  new Item('kasia', 2),
  new Item('ma', 3),
  new Item('duza', 10),
  new Item('papuge', 4)
];

console.log('Objects by ranking:');
objectsByRanking(array).forEach(function(item) {
  console.log(item.name + ' ' + item.ranking);
});

console.log('\nAverage rank: ' + averageRanking(array));