Tour of Go 2.0

Constants

Constants are declared like variables but with the const keyword. They can hold character, string, boolean, or numeric values.

One rule: you can’t use := to declare a constant. That shorthand is for variables only.

main.go ▶ Run in Playground 
package main

import "fmt"

const Pi = 3.14

func main() {
	const World = "世界"
	fmt.Println("Hello", World)
	fmt.Println("Happy", Pi, "Day")

	const Truth = true
	fmt.Println("Go rules?", Truth)
}