code: function _mapDataValue(data, nestedSchema) {
      if (typeof nestedSchema === 'function') {
          return nestedSchema.apply(data);
      } else if (typeof nestedSchema === 'object') {
          return _map(data, nestedSchema);
      } else {
          return _getDataValue(data, nestedSchema);
      }
  }
docs: Returns the value of an object from a nested schema
  @param data Object to map
  @param nestedSchema Path to value, function to execute or nested schema
  @returns {*}
  @private