Enums

Go does not have a built-in enum type like some other languages (e.g., C or Java), but you can achieve similar functionality using a combination of constants and the iota keyword.

Iota

https://go.dev/wiki/Iota

Go’s iota identifier is used in const declarations to simplify definitions of incrementing numbers.

const (
  East = iota
  West
  North
  South
)

fmt.Println(South) // 3

Using an enum

To create an enum, you first have to declare a variable that will hold the enum.

type Shape int

When initialising the constant, you can assign the Shape variable to it

const (
  East Shape = iota
  West
  North
  South
)

Now you can pass the Shape *enum as an argument to functions

func printShape(s Shape) {
  fmt.Print(s)
}