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Say I have these Backbone.js Model: var Truck = Backbone.Model.extend({}); var truck1 = new Truck(); var truck2 = new Truck(); truck1.set("brand", "Ford"); truck2.set("brand", "Toyota"); truck3.set("brand", "Honda"); truck4.set("brand", "Ford"); Then, let's say we have a Backbone.js Collection: var TruckList = Backbone.Collection.extend({ model: Truck, comparator: function(truck) { return truck.get("brand"); }; }); I'm a car collector, so time to add each car to my collection: Trucks = new TruckList(); Trucks.add(truck1); Trucks.add(truck2); Trucks.add(truck3); Trucks.add(truck4); Just focusing on the brand attribute, truck4 is a duplicate of truck1. I can't have duplicates in my Collection. I need my collection to have unique values. My question is, How do I remove duplicate items from my Backbone.js Collection? Should I use Underscore.js for this? If so, can someone please provide a working/runnable example of how to do this. Assume the following: 1.Collection is not sorted Removal must be done on brand attribute value Ajax call to populate each instance of a Truck. This means when adding to a collection, you don't have access to the Truck properties.

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