Named nested functions after return

nested-funcs.js

CategoryRepository.prototype.findAll = function(callback) {
  return this.db.collection('categories', onCollectionReady);
  function onCollectionReady(error, collection) {
    if (error) return callback(error);
    collection.find(onCursorReady);
  }
  function onCursorReady(error, cursor) {
    console.log('onCursorReady');    
    if (error) return callback(error, null);
    cursor.toArray(callback);
  }
}