parse collection comparator

parse-comparator.js

//comparator string doesn't work, so you need to provide a sort function,
// read more http://mdn.io/sort

var Foo = Parse.Object.extend("Foo");

var Foos = Parse.Collection.extend("Foos", {
  model: Foo
});

var foos = new Foos();

foos.add({
  name: "A",
  hello: 1,
  world: 7
});

foos.add({
  name: "B",
  hello: 3,
  world: 6
});

foos.add({
  name: "C",
  hello: 2,
  world: 5
});

foos.comparator = function(a,b) {
  //where 1 means move right (to the end)
  //and  -1 means move left (to the beginning)
  if(a.get("hello") > b.get("hello")) {
    return 1;
  }
  return -1;
};

foos.sort();

foos.each(function(foo) {
  console.log(foo.get("name"));
});
// A
// C
// B