Backbone.Collection subtype which uses native-style comparators

backbone_NativeSortingCollection.js

var NativeSortingCollection = Backbone.Collection.extend({
	sortedIndex: function(candidate, comparator){
		var i = 0;
		while (i < this.models.length && comparator(this.models[i], candidate) <= 0) {
			i++;
		}
		return i;
	},
	sortBy: function(comparator){
		return this.models.sort(comparator);
	}
});