TypeScript Enums

• An enum is a special "class" that represents a group of constants.
• Enums come in two flavors string and numeric.

Numeric Enums - Default:

By default, enums will initialize the first value to 0 and add 1 to each additional value: 

Example:
enum CardinalDirections {
  North,
  East,
  South,
  West
};
            
let currentDirection = CardinalDirections.North;
console.log(currentDirection);
// Output:0

Numeric Enums - Initialized:

You can set the value of the first numeric enum and have it auto increment from that:

Example:
enum CardinalDirections {
  North = 1,
  East,
  South,
  West
};

console.log(CardinalDirections.North);
console.log(CardinalDirections.West);
//Output :1
//Output: 4

Numeric Enums - Fully Initialized:

You can assign unique number values for each enum value. Then the values will not incremented automatically:

Example:
enum StatusCodes {
  NotFound = 404,
  Success = 200,
  Accepted = 202,
  BadRequest = 400
};

console.log(StatusCodes.NotFound);
console.log(StatusCodes.Success);
//Output:404
//Output:200

String Enums:

Enums can also contain strings  This is more common than numeric enums, because of their readability and intent.

Example:
enum CardinalDirections {
  North = 'North',
  East = "East",
  South = "South",
  West = "West"
};

console.log(CardinalDirections.North);
console.log(CardinalDirections.West);
//Output:North
//output:West