Enum

A type to name a set of numeric values:

Number values default to 0:

enum Day { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday };
let bestDay: Day = Day.Saturday;

Set a default starting number:

enum TenPlus { Ten = 10, Eleven, Twelve }

or assign values:

enum MyOddSet { Three = 3, Five = 5, Seven = 7, Nine = 9 }

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