Most methods of the “Group” class are exactly the same as the ones defined in the Group class of ruby extension (Chapter I.3). Several methods or properties are different however:
The iterators are now “iter_element”, “iter_rbe”, “iter_node” and “iter_coordsys” instead of “each_element”, “each_rbe”, “each_node” and “each_coordsys”.
The four operators “+”, “-”, “*” and “/” are replaced by the methods “opAdd”, “opSub”, “opMul” and “opDiv” respectively.
The “toBlob” and “fromBlob” methods deal with Array of Bytes (unsigned char) instead of Strings in the ruby extension.
The “makeCopy” method returns a copy of the object.