JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://documentcloud.github.com/underscore/underscore-min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/backbone.js/0.9.9/backbone-min.js"></script>

JavaScript

var Model = Backbone.Model.extend();
var Collection = Backbone.Collection.extend({ model: Model });

var model1 = new Model();
var model2 = new Model();
var collection = new Collection([model1, model2]);

console.log(_(collection.models).pluck('cid'));

collection.on('add', function(model, collection, options){
    collection.at(0).destroy();
});

collection.add(new Model(), { at: 0 });

console.log(_(collection.models).pluck('cid'));