Enums in Golang

main.go

package main

import (
	"fmt"
)

type COLOR int32

const (
	BLACK COLOR = iota
	BLUE
	RED
)

var ColorName = map[COLOR]string{
	BLACK: "black",
	BLUE:  "blue",
	RED:   "red",
}

var ColorValue = map[string]COLOR{
	"black": BLACK,
	"blue":  BLUE,
	"red":   RED,
}

func (x COLOR) String() string {
	return ColorName[x]
}

func main() {
	fmt.Println("by const:", RED)
	fmt.Println("by key:", COLOR(3))
	fmt.Println("by value", ColorValue["black"])
	fmt.Printf("enum:  %d \n", BLUE)
	fmt.Printf("enum string:  %s \n", BLUE)
}