Arrays in a Backbone.js Model are essentially static?

Question

Why are arrays in a Backbone.js Model essentially static variables?

class exports.Content extends Backbone.Model
    tags: []

then if i mak

Answer 1

"tags" is being declared on the Content.prototype - which is shared across all instances of Content. You probably need to use defaults instead: http://backbonejs.org/#Model-defaults. However, it should be noted that you must use a function (instead of a hash) when defining defaults, otherwise you still run into the same problem when using types which are passed by reference (e.g. Array).

var Content = Backbone.Model.extend({
  defaults: function() { 
    return {
      tags: []
    };
  }
});