Convert an array into a comma seperated sentence.

getNames.jsx

getNames: function(people) {
  var length = people.length;

  if (length == 0) {
    return "";
  } else if (length == 1) {
    return people[0].name;
  } else if (length == 2) {
    return people[0].name + " and " + people[1].name;
  } else {
    var clonedPeople = people.slice(0);
    var names = clonedPeople.splice(0, length - 1).map(function(person) {
      return person.name;
    });
  }

  var lastname = people[length-1].name;
  return names.join(", ") + " and " + lastname;
}