These are contructed to be more easily extensible since you can override the _header(), _data() or _footer() components individually. The default methods are built on top of format().

obj_print(x, ...)

obj_print_data(x, ...)

obj_print_footer(x, ...)

obj_str(x, ...)

obj_str_footer(x, ...)
x A vector Additional arguments passed on to methods. See print() and str() for commonly used options