purpose of app-wide bases in backbone

backbone_app_bases.js

App.Views.ViewBase = Backbone.View.extend({
  childViews: [],
  
  addChild: function(view) {
    // etc
  },
  
  close: function() {
    this.childViews.forEach(function(childView) {
      childView.close();
    });
    
    this.remove();
  },
  
  removeChild: function(view) {
    // etc
  }
});

App.Views.MinersIndex = App.Views.ViewBase.extend({
  
});

App.Collections.CollectionBase = Backbone.Collection.extend({
  parse: function(data) {
    // perhaps all calls to your api come back with stuff in the 'results' property
    return data.results;
  }
});

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