(Blog) Enum type in Go

enum_type_demo.go

package main

import "fmt"

type myColor string

const (
	RED   myColor = "red"
	GREEN myColor = "green"
	BLUE  myColor = "blue"
)

func PrintColor(color myColor) {
	fmt.Println(color)
}

func main() {
	PrintColor(RED)
	PrintColor(BLUE)

	// Compile error : undefined: BLACK
	// PrintColor(BLACK)

	// Compile error : cannot use 20 (type int) as type myColor in function argument
	// PrintColor(20)
}