Another nice feature is sets and ranges, so you can have something like type Day = (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday);

Another nice feature is sets and ranges, so you can have something like type Day = (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday); Days = set of Day; const Weekdays = [Monday..Friday]; ... if Today in Weekdays then ... ... Sets are essentially bit flags but they look much better than a series of #define MONDAY 0x0001 #define TUESDAY 0x0002 etc. IMO, of course :-P.