demo/amd/rjs/output/unified/marionette-build.js
function(child, index) {
      var filter = this.getOption('filter');
      return !_.isFunction(filter) || filter.call(this, child, index, this.collection);
    }
function(child, index) {
      var filter = this.getOption('filter');
      return !_.isFunction(filter) || filter.call(this, child, index, this.collection);
    }
Return true if the given child should be shown Return false otherwise The filter will be passed (child, index, collection) Where 'child' is the given model 'index' is the index of that model in the collection 'collection' is the collection referenced by this CollectionView