Golang const iota

const (
	C0 = iota
	C1
	C2
)
fmt.Println(C0, C1, C2) // "0 1 2"

Golang iota enum

type Direction int

const (
    North Direction = iota
    East
    South
    West
)

func (d Direction) String() string {
    return [...]string{"North", "East", "South", "West"}[d]
}

Source: yourbasic.org

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