code: function (expectedClass) {
              _gpfAssertAttributeClassOnly(expectedClass);
              var result = new _gpfA.Array();
              result._array = this._array.filter(function (attribute) {
                  return attribute instanceof expectedClass;
              });
              return result;
          }
docs: Returns a new array with all attributes matching the expected class
  
  @param {Function} expectedClass the class to match
  @return {gpf.attributes.Array}