Note
Enumeration - A set of name to integer value associations.
Declaring an Enumeration
Enumerations are handy to use as fields and properties in classes
.
enum Day:
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
class Action:
[Property(Day)]
_day as Day
Enumerations are also handy in preventing "magic numbers", which can cause unreadable code.
Note
Magic Number - Any number outside of -1, 0, 1, or 2.
Enumerations technically assign an integer value to each value, but that should generally be abstracted from view.
enum Test:
Alpha
Bravo
Charlie
// is the same as
enum Test:
Alpha = 0
Bravo = 1
Charlie = 2
Hint
Except in special cases, do not assign numbers.
Exercises
- Think of another good instance of using enums.