question: get the first parameter concode_field_sep int result concode_elem_sep BiFunction<NumberExpression,NumberExpression,E> factory concode_elem_sep String expectedToString concode_elem_sep NumberExpression first concode_elem_sep NumberExpression second concode_field_sep void testToString concode_elem_sep List<Object[]> prepareParameters concode_elem_sep void testInterpret
target: NumberExpression function ( ) { return this . first ; }